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Effects of droughts and floods on the water quality and drinking water function of the river Meuse

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(1)BTO 2006.073 (s) november 2006. Addenda: Effects of Droughts and Floods on the Water Quality and Drinking Water Function of the River Meuse a Preview of Climate Change?.

(2) BTO 2006.073 (s) november 2006. Addenda: Effects of Droughts and Floods on the Water Quality and Drinking Water Function of the River Meuse a Preview of Climate Change?. © 2006 Kiwa Water Research Alle rechten voorbehouden. Niets uit deze uitgave mag worden verveelvoudigd, opgeslagen in een geautomatiseerd gegevensbestand, of openbaar gemaakt, in enige vorm of op enige wijze, hetzij elektronisch, mechanisch, door fotokopieën, opnamen, of enig andere manier, zonder voorafgaande schriftelijke toestemming van de uitgever.. Kiwa Water Research Groningenhaven 7 Postbus 1072 3430 BB Nieuwegein Tel. 030 606 95 11 Fax 030 606 11 65 www.kiwawaterresearch.eu.

(3) Colofon Title Effects of Droughts and Floods on the Water Quality and Drinking Water Function of the River Meuse: a Preview of Climate Change? Project number 111.614.030 Project manager Ir. T.A.B. Ramaker Quality Assurance dr. J.J.G. Zwolsman dr. H. Middelkoop Author M.T.H. van Vliet.

(4) Table of contents A. Effects of droughts on water quality Addendum A1: General water quality parameters during droughts. 1. A1.1 Water temperature. 1. A1.2 Oxygen. 3. A1.3 Chlorophyll-a. 5. A1.4 Suspended solids. 7. Addendum A2: Conservative substances during droughts. 9. A2.1 Chloride. 9. A2.2 Bromide. 11. A2.3 Fluoride. 13. A2.4 Sulphate. 15. A2.5 Sodium. 17. A2.6 Potassium. 19. A2.7 Calcium. 21. A2.8 Magnesium. 23. Addendum 3: Nutrients during droughts. 25. A3.1 Nitrate. 25. A3.2 Nitrite. 27. A3.3 Ammonium. 29. A3.4 Ortho-phosphate. 31. A3.5 Total phosphate. 33. Addendum 4a: Total heavy metals and metalloids during droughts. 35. A4a.1 Total lead. 35. A4a.2 Total copper. 37. A4a.3 Total zinc. 39. A4a.4 Total nickel. 41. A4a.5 Total mercury. 43. A4a.6 Total chrome. 45. A4a.7 Total cadmium. 47. A4a.8 Total arsenic. 49. A4a.9 Total selenium. 51. A4a.10 Total barium. 52.

(5) Addendum A4b: Dissolved heavy metals during droughts. 55. A4b.1 Dissolved lead. 55. A4b.2 Dissolved copper. 57. A4b.3 Dissolved zinc. 59. A4b.4 Dissolved nickel. 61. A4b.5 Dissolved mercury. 63. A4b.6 Dissolved chrome. 65. A4b.7 Dissolved cadmium. 67. Addendum A5a: Polycyclic aromatic hydrocarbons (PAHs) during droughts. 69. A5a.1 Benzo(a)pyrene. 69. A5a.2 Fluoranthene. 71. Addendum A5b: Pesticides during droughts. 73. A5b.1 Atrazine. 73. A5b.2 Simazine. 75. A5b.3 Diuron. 77. A5b.4 Isoproturon. 79. A5b.5 Glyfosaat. 81. A5b.6 AMPA. 83. Addendum A5c: Other organic micro pollutants during droughts. 85. A5c.1 MTBE. 85. A5c.2 Benzene. 87. A5c.3 1.2-Dichloroethane. 89. A5c.4 Chloroform. 91.

(6) B. Effects of floods on water quality Addendum B1: General water quality parameters during floods. 93. B1.1 Water temperature. 93. B1.2 Oxygen. 95. B1.3 Chlorophyll-a. 97. B1.4 Suspended solids. 99. Addendum B2: Conservative substances during floods. 101. B2.1 Chloride. 101. B2.2 Fluoride. 103. B2.3 Sulphate. 105. B2.4 Sodium. 107. B2.5 Potassium. 109. B2.6 Magnesium. 111. Addendum B3: Nutrients during floods. 113. B3.1 Nitrate. 113. B3.2 Nitrite. 115. B3.3 Ammonium. 117. B3.4 Ortho-phosphate. 119. B3.5 Total phosphate. 121. Addendum B4: Total heavy metals and metalloids during floods. 123. B4.1 Total Lead. 123. B4.2 Total copper. 125. B4.3 Total zinc. 127. B4.4 Total nickel. 129. B4.5 Total mercury. 131. B4.6 Total chrome. 133. B4.7 Total cadmium. 135. B4.8 Total arsenic. 137. Addendum B5: Polycyclic aromatic hydrocarbons (PAHs) during floods. 139. B5.1 Benzo(a)pyrene. 139. B5.2 Fluoranthene. 141.

(7) Addendum C1: Discharge projections of Meuse for 2050. 143. Addendum C2: Day-night fluctuations in oxygen concentrations in Meuse at Eijsden during heat wave of July 2006. 144. Addendum C3: Concentration projections of conservative substances for 2050. 145.

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(9) Addendum A1: General water quality parameters during droughts A1.1 Water temperature. 2002 - 2004 Eijsden Water temperature (C). 25 20 15 10 5. © Kiwa Water Research. 20 15 10 5. discharge Keizersveer w aterT Keizersveer. 2002 2004. -1-. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 0 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 25. Date. Date discharge Eijsden w aterT Eijsden. 2-mrt. 0 1-jan. 0. Water temperature (C). 0. 2002 - 2004 Keizersveer 30. 30. Water temperature (C). 5 27-09-04. 500 19-06-04. 10. 11-03-04. 1000. 02-12-03. 15. 24-08-03. 1500. 16-05-03. 20. 05-02-03. 2000. 28-10-02. 25. 20-07-02. 2500. 11-04-02. 30. 01-01-02. Discharge (m3/s). 2002 - 2004 3000. Date 2003 standards. 2002 2004. 2003 standards. november 2006.

(10) median waterT (°C). mean waterT (°C). min waterT (°C). location. summer (Jun-Aug). Eijsden. 1975 1976 1977 2002 2003 2004. 21.7 23.7 21.1. 21.7 23.7 21.5. 19.2 20.7 18.6. 2002 2003 2004. 20.5 22.5 19.4. 20.8 22.4 20.3. 18.9 20.4 18.9. Eijsden. Keizersveer. max waterT (°C). n. n> 25 °C. 24.1 26.9 25.6. 0 0 0 92 92 92. 0 12 2. 23.8 24.2 23.2. 6 6 7. 0 0 0. 2002 - 2004 Eijsden. 2002 - 2004 Eijsden 30. y = 56,773x -0,3078 R2 = 0,4685. 30 25 20 15 10 5 0. Water temperature (C). Water temperature (C). 35. y = 0,6873x + 4,4957 R2 = 0,6482. 25 20 15 10 5 0. 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 2000. 2500. -5. 0. 5. 10. 15. 20. 25. 30. 35. Air temperature (C). -2-. november 2006.

(11) A1.2 Oxygen 1975 - 1977. 1975 - 1977 Eijsden. 12. 1000 800. 8. 600 400. 4. Oxygen (mg/l). 1200. Oxygen (mg/l). 12 8 4. 200 27-dec. 28-okt. 29-aug. 30-jun. 1975 1977. oxygen Eijsden. 2002 - 2004. 1976 standards. 2002 - 2004 Eijsden. 1000. 4. 500. 12 8 4. 12 8 4. Date discharge Eijsden oxygen Eijsden. © Kiwa Water Research. 2002 2004. -3-. 27-dec. 28-okt. 29-aug. 30-jun. Date. Date discharge Keizersveer oxygen Keizersveer. 1-mei. 2-mrt. 1-jan. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 0 2-mrt. 0 1-jan. 27-09-04. 19-06-04. 11-03-04. 02-12-03. 24-08-03. 16-05-03. 05-02-03. 28-10-02. 20-07-02. 11-04-02. 0 01-01-02. 0. 16. Oxygen (mg/l). 8. 1500. Oxygen (mg/l). 12. 2000. Oxygen (mg/l). 2500. 2002 - 2004 Keizersveer. 16. 16. 3000. Discharge (m3/s). 1-mei. Date. Date discharge Eijsden. 2-mrt. 0. 27-09-77. 19-06-77. 11-03-77. 01-12-76. 23-08-76. 15-05-76. 05-02-76. 28-10-75. 20-07-75. 11-04-75. 0 01-01-75. 0. 1-jan. Discharge (m3/s). 16. 16. 1400. 2003 standards. 2002 2004. 2003 standards. november 2006.

(12) location. summer (Jun-Aug). median O2 (mg/l). mean O2 (mg/l). min O2 (mg/l). max O2 (mg/l). n. n< 5 mg/l. Eijsden. 1975 1976 1977. 7.8 8.6 7.3. 8.1 8.5 7.3. 6.4 4.3 6.1. 10.8 15.7 8.4. 9 13 13. 0 2 0. Eijsden. 2002 2003 2004. 5.3 6.0 5.6. 5.5 6.2 5.7. 3.3 4.9 3.6. 6.9 8.5 7.7. 13 13 14. 4 2 5. Keizersveer. 2002 2003 2004. 7.8 6.8 8.1. 7.7 6.8 8.0. 6.9 6.4 6.5. 8.1 7.0 10.1. 6 6 7. 0 0 0. 2002 - 2004 Eijsden. 2002 - 2004 Eijsden 16. 16. 12. 12 y = 2,7987x 0,2219 R2 = 0,583 8. 4. 0. Oxygen (mg/l). Oxygen (mg/l). y = -0,3905x + 14,172 R2 = 0,7638. 8. 4. 0 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 2000. 2500. 0. 5. 10. 15. 20. 25. 30. Water temperature (C). -4-. november 2006.

(13) A1.3 Chlorophyll-a 1975 - 1977. 1975 - 1977 Eijsden. 10. 0 1-jan. 27-09-77. Date 1975 1977. 2002 - 2004 Eijsden Chlorophyll-a (ug/l). 0. © Kiwa Water Research. discharge Keizersveer chlorophyll-a Keizersveer. 60 40 20. Date 2002 2004 BKMO/MTR. -5-. 27-dec. 28-okt. 0. Date discharge Eijsden chlorophyll-a Eijsden. 80. 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 20. 27-dec. 20. 500. 40. 28-okt. 40. 1000. 60. 29-aug. 60. 1500. 80. 30-jun. 80. 2000. 1-mei. 2500. 2002 - 2004 Keizersveer 100. 100. 1-jan. 100. Chlorophyll-a (ug/l). 3000. Chlorophyll-a (ug/l). Discharge (m3/s). 2002 - 2004. 1976 RIWA-Meuse. 30-jun. chlorophyll-a Eijsden. 2-mrt. discharge Eijsden. 1-mei. Date. 2-mrt. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. 0 1-01-75. 0. 10. 1-jan. 200. 27-dec. 400. 20. 28-okt. 20. 29-aug. 600. 30. 30-jun. 30. 1-mei. 800. 40. 2-mrt. 40. 1000. Chlorophyll-a (ug/l). 1200. Chlorophyll-a (ug/l). Discharge (m3/s). 50. 50. 1400. Date 2003 RIWA-M. 2002 2004 BKMO/MTR. 2003 RIWA-M. november 2006.

(14) location. summer (Jun-Aug). median Chl-a (ug/l). mean Chl-a (ug/l). min Chl-a (ug/l). max Chl-a (ug/l). n> 25 ug/l RIWA-M. n> 100 ug/l BKMO/MTR. Eijsden. 1975 1976 1977. 25.0 18.0. 25.4 14.7. 11.0 6.0. 45.0 20.0. 0 5 3. 2 0. 0 0. Eijsden. 2002 2003 2004. 26.0 38.0 12.0. 34.3 39.8 14.9. 17.0 14.0 7.0. 68.0 86.0 36.0. 13 13 14. 8 11 3. 0 0 0. Keizersveer. 2002 2003 2004. 3.0 3.5 3.0. 3.8 3.8 5.1. 2.0 3.0 2.0. 6.0 5.0 19.0. 6 6 7. 0 0 0. 0 0 0. 2002 - 2004 Eijsden. 2002 - 2004 Eijsden 100. 100 y = 72,607x -0,4471 R2 = 0,1822. 80. Chlorophyll-a (ug/l). Chlorophyll-a (ug/l). n. 60 40 20 0. y = 1,4436x - 4,7214 R2 = 0,2724. 80 60 40 20 0. 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 2000. 2500. 0. 5. 10. 15. 20. 25. 30. Water temperature (C). -6-. november 2006.

(15) A1.4 Suspended solids 1975 - 1977 Eijsden. 20. 200. 20 0 1-jan. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. Date. © Kiwa Water Research. discharge Keizersveer suspended solids Keizersveer. 40 20. Date. Date 2002. -7-. 2003. 28-okt. 0 27-dec. Date. 60. 29-aug. 0. 80. 30-jun. 20. 100. 1-jan. Suspended solids (mg/l). 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 40. 27-dec. 20. 500. 28-okt. 40. 1000. 60. 29-aug. 60. 1500. 80. 1-mei. 80. 2000. 2002 - 2004 Keizersveer. 100. 1-jan. 2500. Suspended solids (mg/l). 100. discharge Eijsden suspended solids Eijsden. 1977. 2002 - 2004 Eijsden. 3000. Suspended solids (mg/l). Discharge (m3/s). 2002 - 2004. 1976. 1-mei. 1975. suspended solids Eijsden. 2-mrt. discharge Eijsden. 2-mrt. Date. 30-jun. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. 0 1-01-75. 0. 40. 27-dec. 40. 400. 28-okt. 600. 60. 29-aug. 60. 30-jun. 800. 80. 1-mei. 80. 1000. 100. 2-mrt. Discharge (m3/s). 1200. Suspended solids (mg/l). 100. Suspended solids (mg/l). 1975 - 1977 1400. 2004. 2002. 2003. 2004. november 2006.

(16) location. period (Jun-Nov). median Susp_sol (mg/l). mean Susp_sol (mg/l). min Susp_sol (mg/l). max Susp_sol (mg/l). n. Eijsden. 1975 1976 1977. 8.0 9.0 13.0. 9.8 9.9 19.2. 1.0 1.0 2.0. 36.0 25.0 82.0. 20 25 26. Eijsden. 2002 2003 2004. 7.0 6.0 4.4. 18.2 7.4 5.3. 1.1 1.7 2.0. 446.0 82.9 35.0. 171 183 183. Keizersveer. 2002 2003 2004. 5.6 7.7 4.4. 8.1 6.6 5.6. 2.0 1.9 2.0. 25.7 10.1 13.0. 11 7 7. 2002 - 2004 Eijsden Suspended solids (mg/l). 500 400 300 200 100 0 0. 500. 1000. 1500. 2000. 2500. Discharge (m3/s). © Kiwa Water Research. -8-. november 2006.

(17) Addendum A2: Conservative substances during droughts A2.1 Chloride. 1975 - 1977. 1975 - 1977 Eijsden. 120. 1000 800. 80. 600 400. 40. Chloride (mg/l). 1200. Chloride (mg/l). 120 80 40. 200. 1976. RIWA-M. DWD. 2002 - 2004. 28-okt. 27-dec. Chloride (mg/l). 80 40. 2002. 2003. RIWA-M. DWD. -9-. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 1-jan. 27-dec. Date. Date. Date discharge Keizersveer chloride Keizersveer. 120. 0 28-okt. 0 29-aug. 27-09-04. 19-06-04. 11-03-04. 02-12-03. 24-08-03. 16-05-03. 05-02-03. 28-10-02. 20-07-02. 0 11-04-02. 0. 40. 30-jun. 40. 500. 80. 1-mei. 1000. 120. 2-mrt. 80. 1500. 2002 - 2004 Keizersveer 160. 1-jan. 120. 2000. Chloride (mg/l). 2500. 01-01-02. 29-aug. 2002 - 2004 Eijsden Chloride (mg/l). Discharge (m3/s). 1977. 160. 160. © Kiwa Water Research. 30-jun. 1975. 2-mrt. chloride Eijsden. 3000. discharge Eijsden chloride Eijsden. 1-mei. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 2-mrt. 0. 0 1-01-75. 0. 1-jan. Discharge (m3/s). 160. 160. 1400. 2004. 2002. 2003. RIWA-M. DWD. 2004. november 2006.

(18) location. period (Jun-Nov). median Cl (mg/l). mean Cl (mg/l). min Cl (mg/l). max Cl (mg/l). n. n> 75 mg/l RIWA-M. n> 150 mg/l DWD. n> 200 mg/l BKMO. Eijsden. 1975 1976 1977. 72.0 102.0 51.0. 73.4 101.4 57.3. 46.0 60.0 32.0. 104.0 137.0 133.0. 24 26 26. 9 24 4. 0 0 0. 0 0 0. Eijsden. 2002 2003 2004. 45.5 71.9 49.8. 44.9 71.5 53.5. 16.4 30.1 26.9. 77.1 159.6 96.3. 26 26 27. 1 12 4. 0 1 0. 0 0 0. Keizersveer. 2002 2003 2004. 51.6 58.9 52.4. 50.2 56.8 51.5. 26.5 42.4 44.5. 60.8 66.5 56.9. 12 12 12. 0 0 0. 0 0 0. 0 0 0. 2002 - 2004 Eijsden. 1975 - 1977 Eijsden 250. 400 Cl = 3576 / Q + 25,2 R2 = 0,55. 250 200 150 100. 350. Cl = 1897 / Q + 20,3 R2 = 0,72. 200 150 100 50 0. 0. 500. 1000. Discharge (m3/s). © Kiwa Water Research. 1500. 250 200 150 100 50. 50 0. Cl = 2751 / Q +23,8 R2 = 0,62. 300. Chloride (mg/l). 300. Chloride (mg/l). Chloride (mg/l). 350. 2002 - 2004 Keizersveer. 0 0. 500. 1000. 1500. Discharge (m3/s). - 10 -. 2000. 0. 500. 1000. 1500. Discharge (m3/s). november 2006. 2000.

(19) A2.2 Bromide. 2002 - 2004. 2002 - 2004 Eijsden. 1000. 0,1. 500. 0,3 0,2 0,1. 0,3 0,2 0,1. Date discharge Eijsden bromide Eijsden. © Kiwa Water Research. 2002 2004. - 11 -. 27-dec. 28-okt. 29-aug. 30-jun. Date. Date discharge Keizersveer bromide Keizersveer. 1-mei. 2-mrt. 1-jan. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 0 2-mrt. 0 1-jan. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 0,4. Bromide (mg/l). 0,2. 1500. Bromide (mg/l). 0,3. 2000. Bromide (mg/l). Discharge (m3/s). 2500. 2002 - 2004 Keizersveer. 0,4. 0,4. 3000. 2003 RIWA-M. 2002 2004. 2003 RIWA-M. november 2006.

(20) median Br (mg/l). mean Br (mg/l). min Br (mg/l). max Br (mg/l). n> 0.05 mg/l RIWA-M. n> 8 mg/l MTR. 0.30 0.20. 0 13 13. 11 13. 0 0. 0.10 0.17 0.12. 6 6 6. 6 6 6. 0 0 0. location. period (Jun-Nov). Eijsden. 1975 1976 1977. 0 0 0. Eijsden. 2002 2003 2004. 0.14 0.08. 0.14 0.10. 0.04 0.06. 2002 2003 2004. 0.09 0.12 0.10. 0.09 0.12 0.10. 0.06 0.06 0.07. Keizersveer. n. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 0,5. 0,35 Br = 1,94 / Q + 0,055 R2 = 0,63. 0,2 0,15 0,1. 0,3 0,2 0,1. 0,05 0. 0 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. Br = 3,49 / Q + 0,060 R2 = 0,64. 0,4. 0,25. Bromide (mg/l). Bromide (mg/l). 0,3. - 12 -. 2000. 0. 500. 1000. 1500. Discharge (m3/s). november 2006. 2000.

(21) A2.3 Fluoride 1975 - 1977. 1975 - 1977 Eijsden 4. 1200 3. 1000 800. 2. 600 400. 1. Fluoride (mg/l). 4. Fluoride (mg/l). 3 2 1. 200. 2002 - 2004. 27-dec. 28-okt. Fluoride (mg/l). 0. 1 0,5. 2002 2004 MKE. - 13 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. Date. Date. Date discharge Keizersveer fluoride Keizersveer. 1,5. 0. 28-okt. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 0. 11-04-02. 0. 0,5. 29-aug. 0,5. 500. 30-jun. 1000. 1. 1-mei. 1. 1,5. 2-mrt. 1500. 2002 - 2004 Keizersveer 2. 1-jan. 1,5. 2000. Fluoride (mg/l). 2500. 1-01-02. 29-aug. 2002 - 2004 Eijsden Fluoride (mg/l). Discharge (m3/s). 1976 BKMO/RIWA-M. 2. 2. © Kiwa Water Research. 30-jun. 1975 1977 MKE. fluoride Eijsden. 3000. discharge Eijsden fluoride Eijsden. 1-mei. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 2-mrt. 0. 0. 1-01-75. 0. 1-jan. Discharge (m3/s). 1400. 2003 BKMO/RIWA-M. 2002 2004 MKE. 2003 BKMO/RIWA-M. november 2006.

(22) mean F (mg/l). min F (mg/l). max F (mg/l). n. n> 1 mg/l BKMO/RIWA-M. n> 1.1 mg/l DWD. n> 1.5 mg/l MKE. location. period (Jun-Nov). median F (mg/l). Eijsden. 1975 1976 1977. 0.80 1.40 0.85. 0.99 1.45 0.90. 0.30 0.10 0.30. 2.80 3.40 2.80. 16 25 26. 6 14 8. 4 13 4. 3 10 2. Eijsden. 2002 2003 2004. 0.69 1.10 0.33. 0.75 1.15 0.41. 0.15 0.81 0.10. 1.40 1.80 0.84. 13 13 13. 3 8 0. 1 4 0. 0 2 0. Keizersveer. 2002 2003 2004. 0.41 0.45 0.37. 0.41 0.42 0.40. 0.25 0.28 0.32. 0.52 0.50 0.58. 7 7 7. 0 0 0. 0 0 0. 0 0 0. 1975 - 1977 Eijsden. 2002 - 2004 Eijsden 3. 4. 2. 1. 2 1,5 1. 0 0. 500. 1000. Discharge (m3/s). © Kiwa Water Research. 1500. 1,5 1 0,5. 0,5 0. F = 19,2 / Q + 0,24 R2 = 0,56. 2. Fluoride (mg/l). 3. 2,5. F = 19,4 / Q + 0,23 R2 = 0,73. 2,5. Fluoride (mg/l). Fluoride (mg/l). F = 35,4 / Q + 0,40 R2 = 0,27. 2002 - 2004 Keizersveer. 0 0. 500. 1000. 1500. Discharge (m3/s). - 14 -. 2000. 0. 500. 1000. 1500. Discharge (m3/s). november 2006. 2000.

(23) A2.4 Sulphate 1975 - 1977 Eijsden 120. 1200. 100. 100. 1-jan. 27-09-77. 1975 1977 BKMO/MTR. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer. 100. 100. 2500. 80. 80. 80. 0. © Kiwa Water Research. discharge Keizersveer sulphate Keizersveer. 40 20. 2002 2004 BKMO/MTR. - 15 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 27-dec. 28-okt. Date. Date. Date discharge Eijsden sulphate Eijsden. 60. 0. 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 20. 30-jun. 20. 500. 40. 1-mei. 40. 1000. 60. 2-mrt. 60. 1500. 1-jan. 2000. Sulphate (mg/l). 100. Sulphate (mg/l). 3000. Sulphate (mg/l). Discharge (m3/s). 2002 - 2004. 1976 RIWA-M. 2-mrt. sulphate Eijsden. 1-jan. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 27-dec. 0. 0. 1-01-75. 0. 20. 28-okt. 20. 200. 40. 29-aug. 40. 400. 60. 30-jun. 60. 600. 80. 1-mei. 80. 800. 2-mrt. 1000. Sulphate (mg/l). 120. Sulphate (mg/l). Discharge (m3/s). 1975 - 1977 1400. 2003 RIWA-M. 2002 2004 BKMO/MTR. 2003 RIWA-M. november 2006.

(24) location. period (Jun-Nov). median SO4 (mg/l). mean SO4 (mg/l). min SO4 (mg/l). max SO4 (mg/l). n. n> 75 mg/l RIWA-M. n> 100 mg/l BKMO/MTR. n> 150 mg/l DWD. Eijsden. 1975 1976 1977. 64.0 72.5 51.0. 64.5 72.3 53.7. 43.0 49.0 38.0. 90.0 97.0 79.0. 21 26 23. 3 9 1. 0 0 0. 0 0 0. Eijsden. 2002 2003 2004. 49.2 67.0 48.0. 46.6 62.5 50.0. 24.9 34.7 37.0. 63.4 79.3 65.0. 26 26 27. 0 1 0. 0 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 61.0 70.0 60.0. 60.3 67.4 59.1. 39.0 53.0 53.0. 67.0 77.0 64.0. 12 7 7. 0 1 0. 0 0 0. 0 0 0. 1975 - 1977 Eijsden. 2002 - 2004 Eijsden. 200. 250. 100. 50. SO4 = 1569,4 / Q + 26,7 R2 = 0,83. 200 150 100 50. 0 500. 1000. Discharge (m3/s). © Kiwa Water Research. 1500. 200 150 100 50. 0 0. SO4 = 2132,9 / Q + 38,3 R2 = 0,67. 250. Sulfate (mg/l). 150. Sulfate (mg/l). Sulphate (mg/l). SO4 = 1951,2 / Q + 29,4 R2 = 0,50. 2002 - 2004 Keizersveer 300. 0 0. 500. 1000. 1500. Discharge (m3/s). - 16 -. 2000. 0. 500. 1000. 1500. Discharge (m3/s). november 2006. 2000.

(25) A2.5 Sodium. 2002 - 2004 Keizersveer. 500. 10. 1-jan. 27-09-04. 19-06-04. 11-03-04. 02-12-03. 24-08-03. 16-05-03. 05-02-03. 28-10-02. 20-07-02. 11-04-02. 0. Date. Date discharge Keizersveer. © Kiwa Water Research. 20 10. 0. 01-01-02. 0. 30. 27-dec. 20. 28-okt. 1000. 40. 29-aug. 30. 50. 30-jun. 40. 1500. 60. 1-mei. 50. 2-mrt. 2000. 70. Sodium (mg/l). 60. Sodium (mg/l). Discharge (m3/s). 2002 - 2004 2500. 2002 2004. sodium Keizersveer. - 17 -. 2003 RIWA-Meuse. november 2006.

(26) median Na (mg/l). mean Na (mg/l). min Na (mg/l). max Na (mg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. 0 0 0. Eijsden. 2002 2003 2004. 0 0 0. Keizersveer. 2002 2003 2004. 39 49 40. 38 46 39. 18 31 33. 45 54 44. n. 12 7 7. n> 40 mg/l RIWA-M. n> 120 mg/l BKMO. n> 150 mg/l DWD. 4 5 3. 0 0 0. 0 0 0. 2002 - 2004 Keizersveer 250. Na = 1612,5 / Q + 22,6 R2 = 0,71. Sodium (mg/l). 200 150 100 50 0 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. - 18 -. november 2006. 2000.

(27) A2.6 Potassium. Potassium (mg/l). 8. 6 4 2. © Kiwa Water Research. discharge Keizersveer potassium Keizersveer. 4 2. - 19 -. 2003. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. Date. Date 2002. 2-mrt. 1-jan. 27-dec. 28-okt. Date discharge Eijsden potassium Eijsden. 6. 0. 29-aug. 0. 30-jun. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 0. 28-10-02. 0. 20-07-02. 2. 11-04-02. 500. 8. 1-mei. 4. 1000. 10. 2-mrt. 6. 1500. 2002 - 2004 Keizersveer. 10. 1-jan. 8. 2000. Potassium (mg/l). 2500. Potassium (mg/l). 2002 - 2004 Eijsden 10. 1-01-02. Discharge (m3/s). 2002 - 2004 3000. 2004. 2002. 2003. 2004. november 2006.

(28) median K (mg/l). mean K (mg/l). min K (mg/l). max K (mg/l). location. period (Jun-Nov). n. Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 4.5 5.9 4.7. 4.7 5.5 4.7. 2.8 3.8 3.8. 6.4 6.6 5.5. 7 7 7. Keizersveer. 2002 2003 2004. 7.1 8.5 7.3. 6.8 8.3 7.3. 4.8 6.2 6.5. 8.0 9.6 8.0. 6 6 6. 0 0 0. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 40 K = 281,4 / Q + 4,5 R2 = 0,82. K = 120,7 / Q + 2,7 R2 = 0,82. Potassium (mg/l). Potassium (mg/l). 20. 15. 10. 5. 0. 20. 10. 0 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 30. - 20 -. 2000. 0. 500. 1000. 1500. Discharge (m3/s). november 2006. 2000.

(29) A2.7 Calcium. 2002 - 2004 Keizersveer 100. 100. 2000. 80. 80. 1500. 60. 1000. 40. 500. 20. Calcium(mg/l). 27-09-04. 40. © Kiwa Water Research. 27-dec. 28-okt. 30-jun. 1-mei. 29-aug. Date discharge Keizersveer. 2-mrt. 0. 1-jan. 19-06-04. 11-03-04. 02-12-03. 24-08-03. 16-05-03. 05-02-03. 28-10-02. 20-07-02. 11-04-02. 60. 20. 0. 01-01-02. 0. Calcium(mg/l). Discharge (m3/s). 2002 - 2004 2500. Date calcium Keizersveer. 2002. - 21 -. 2003. 2004. november 2006.

(30) median Ca (mg/l). mean Ca (mg/l). min Ca (mg/l). max Ca (mg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. 0 0 0. Eijsden. 2002 2003 2004. 0 0 0. Keizersveer. 2002 2003 2004. © Kiwa Water Research. 63 59 59. 63 61 59. 57 59 56. 68 69 61. n. 6 6 6. - 22 -. november 2006.

(31) A2.8 Magnesium. 2002 - 2004 Keizersveer. 27-09-04. 4 2. Date discharge Keizersveer. © Kiwa Water Research. 27-dec. 0. 1-jan. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 0. 28-10-02. 0. 20-07-02. 2. 11-04-02. 500. 6. 28-okt. 4. 29-aug. 1000. 8. 30-jun. 6. 1-mei. 8. 1500. 10. 2-mrt. 10. Magnesium (mg/l). 2000. 12. Magnesium (mg/l). 12. 1-01-02. Discharge (m3/s). 2002 - 2004 2500. Date magnesium Keizersveer. 2002. - 23 -. 2003. 2004. november 2006.

(32) median Mg (mg/l). mean Mg (mg/l). min Mg (mg/l). max Mg (mg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. 0 0 0. Eijsden. 2002 2003 2004. 0 0 0. Keizersveer. 2002 2003 2004. 8.5 8.8 7.9. 8.0 8.6 8.0. 6.1 7.7 7.6. 9.0 9.1 8.5. n. 6 6 6. 2002 - 2004 Keizersveer. Magnesium (mg/l). 250 Mg = 1912,5 / Q + 18,6 R2 = 0,71. 200 150 100 50 0 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. - 24 -. november 2006. 2000.

(33) Addendum 3: Nutrients during droughts A3.1 Nitrate. 1975 - 1977 Eijsden. 1200. 5. 5. 1. 1975 1977. nitrate Eijsden. 2002 - 2004. 27-dec. 1976 RIWA-M. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer. 2. 500. 1. 0. 0. Nitrate (mg N/l). 1000. 4 3 2 1 0. © Kiwa Water Research. discharge Keizersveer nitrate Keizersveer. 3 2 1. 2002 2004. - 25 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. 29-aug. 30-jun. 1-mei. 2-mrt. 28-okt. Date. Date. Date discharge Eijsden nitrate Eijsden. 4. 0. 1-jan. Nitrate (mg N/l). 3. Nitrate (mg N/l). 1500. 27-09-04. 4. 19-06-04. 2000. 11-03-04. 5. 2-12-03. 5. 24-08-03. 5. 16-05-03. 2500. 5-02-03. 6. 28-10-02. 6. 20-07-02. 6. 11-04-02. 3000. 1-01-02. Discharge (m3/s). 28-okt. Date. Date discharge Eijsden. 29-aug. 0. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 0. 28-10-75. 0. 20-07-75. 1. 11-04-75. 200. 2. 30-jun. 2. 400. 3. 1-mei. 3. 600. 4. 2-mrt. 4. 800. 1-jan. 1000. Nitrate (mg N/l). 6. Nitrate (mg N/l). 6. 1-01-75. Discharge (m3/s). 1975 - 1977 1400. 2003 RIWA-M. 2002 2004. 2003 RIWA-M. november 2006.

(34) location. period (Jun-Nov). median NO3 (mg/l). mean NO3 (mg/l). min NO3 (mg/l). max NO3 (mg/l). n> 5.6 mg/l RIWA-M. n> 10 mg/l BKMO. n> 11.3 mg/l DWD. Eijsden. 1975 1976 1977. 1.80 2.40. 1.66 2.40. 0.60 1.99. 2.90 2.79. 0 26 26. 0 0. 0 0. 0 0. Eijsden. 2002 2003 2004. 2.75 2.31 2.57. 2.86 2.34 2.65. 2.38 1.35 2.13. 4.64 3.12 3.85. 26 26 27. 0 0 0. 0 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 3.50 3.00 3.15. 3.51 3.08 3.21. 3.10 2.80 2.80. 3.80 3.90 4.00. 12 12 12. 0 0 0. 0 0 0. 0 0 0. 2002 - 2004 Eijsden. 2002 - 2004 Eijsden 6. 6. y = 1,7659x R2 = 0,2549. 3 2 1. 4 3 2. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 2000. 2500. 3 2. 0. 0 0. 4. 1. 1. 0. y = 3,4337x -0,0825 R2 = 0,1808. 5. Nitrate (mg N/l). Nitrate (mg N/l). 5. 4. 2002 - 2004 Eijsden 6. y = -0,0694x + 3,951 R2 = 0,455. 0,1021. 5. Nitrate (mg N/l). n. 0. 5. 10. 15. 20. Water temperature (C). - 26 -. 25. 30. 0. 20. 40. 60. Chlorophyll-a (ug/l). november 2006. 80. 100.

(35) A3.2 Nitrite. 2002 - 2004. 2002 - 2004 Eijsden Nitrite (mg N/l). 0. © Kiwa Water Research. discharge Keizersveer nitrite Keizersveer. 0,2 0,1. 2002 DWD. - 27 -. 2003 RIWA-M. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. 28-okt. Date. Date. Date discharge Eijsden nitrite Eijsden. 0,3. 0. 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,1. 30-jun. 0,1. 500. 0,2. 1-mei. 0,2. 1000. 2-mrt. 1500. 0,3. 1-jan. 0,3. 2000. Nitrite (mg N/l). 2500. 2002 - 2004 Keizersveer 0,4. 0,4. 0,4. Nitrite (mg N/l). Discharge (m3/s). 3000. 2004. 2002 DWD. 2003 RIWA-M. 2004. november 2006.

(36) median NO2 (mg/l). mean NO2 (mg/l). min NO2 (mg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.18 0.20 0.13. 0.17 0.22 0.15. 0.03 0.05 0.06. Keizersveer. 2002 2003 2004. 0.05 0.05 0.04. 0.06 0.05 0.04. 0.03 0.02 0.03. max NO2 (mg/l). n. n> 0.03 mg/l DWD. n> 0.1 mg/l RIWA-M. 0 0 0. 0 0 13. 0 0 9. 0.37 0.37 0.31. 26 26 27. 24 26 27. 19 25 19. 0.09 0.07 0.06. 12 12 12. 12 10 12. 0 0 0. 2002 - 2004 Eijsden. 2002 - 2004 Eijsden. y = 0,0096x - 0,0176 R2 = 0,4548. y = 1,5115x -0,5925 R2 = 0,6993 0,3. 0,2. 0,1. 0 0. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 2000. 2500. Nitrite (mg N/l). 0,3. Nitrite (mg N/l). Nitrite (mg N/l). 2002 - 2004 Eijsden 0,4. 0,4. 0,4. 0,2. 0,3. 0,2. 0,1. 0,1. 0. 0 0. 5. 10. 15. 20. Water temperature (C). - 28 -. 25. 30. 0. 20. 40. 60. Chlorophyll-a (ug/l. november 2006. 80. 100.

(37) A3.3 Ammonium 1975 - 1977. 1975 - 1977 Eijsden. 1. 0 1-jan. 27-09-77. Date 1977. DWD. RIWA-M. BKMO. 2002 - 2004. 2002 - 2004 Eijsden Ammonium (mg N/l). 0,5 0. © Kiwa Water Research. discharge Keizersveer ammoniumKeizersveer. 1 0,5. 27-dec. 28-okt. 1-jan. 27-dec. 28-okt. Date. Date discharge Eijsden ammonium Eijsden. 1,5. 0 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 1. 30-jun. 0,5. 500. 1,5. 1-mei. 1000. 2. 1-jan. 1. 1500. Ammonium (mg N/l). 1,5. 2000. Ammonium (mg N/l). Discharge (m3/s). 2500. 2002 - 2004 Keizersveer. 2. 2. 3000. 29-aug. ammonium Eijsden. 1976. 2-mrt. discharge Eijsden. 1975. 30-jun. Date. 1-mei. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. 0 1-01-75. 0. 1. 2-mrt. 200. 27-dec. 400. 2. 28-okt. 2. 29-aug. 600. 3. 30-jun. 3. 1-mei. 800. 4. 2-mrt. 4. 1000. Ammonium (mg N/l). 1200. Ammonium (mg N/l). Discharge (m3/s). 5. 5. 1400. Date. 2002. 2003. 2004. 2002. 2003. 2004. DWD. RIWA-M. BKMO. DWD. RIWA-M. BKMO. - 29 -. november 2006.

(38) location. period (Jun-Nov). median NH4 (mg/l). mean NH4 (mg/l). min NH4 (mg/l). max NH4 (mg/l). n. n> 0.156 DWD. n> 0.2 RIWA-M. n> 1.2 BKMO. Eijsden. 1975 1976 1977. 1.30 1.75 0.83. 1.30 2.15 0.95. 0.30 0.00 0.41. 2.30 4.60 2.32. 24 26 26. 24 24 26. 24 24 26. 14 18 6. Eijsden. 2002 2003 2004. 0.39 0.76 0.46. 0.39 0.75 0.52. 0.03 0.09 0.20. 1.30 1.58 1.07. 26 26 27. 20 25 27. 19 25 26. 1 5 0. Keizersveer. 2002 2003 2004. 0.14 0.17 0.14. 0.14 0.17 0.14. 0.09 0.10 0.06. 0.19 0.30 0.24. 12 12 12. 5 7 4. 0 3 1. 0 0 0. 2002 - 2004 Eijsden. 2002 - 2004 Eijsden. 1,5. 1. 0,5. 0. Ammonium (mg N/l). y = 2,7733x -0,4589 R2 = 0,5177. Ammonium (mg N/l). Ammonium (mg N/l). 2002 - 2004 Eijsden 2. 2. 2. 1,5. 1. 0,5. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 2000. 2500. 1. 0,5. 0. 0 0. 1,5. 0. 5. 10. 15. 20. Water temperature (C). - 30 -. 25. 30. 0. 20. 40. 60. Chlorophyll-a (ug/l. november 2006. 80. 100.

(39) A3.4 Ortho-phosphate 1975 - 1977 Eijsden. Date. 2002 - 2004 Eijsden. discharge Eijsden ortho-phosphate Eijsden. © Kiwa Water Research. 0,6 0,4 0,2. Date discharge Keizersveer ortho-phosphate Keizersveer. 2002 2004. - 31 -. 27-dec. 28-okt. 0 29-aug. Date. 0,8. 1-jan. Ortho-phosphate (mg P/l). 0 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 0,2. 28-okt. 0,2. 500. 0,4. 29-aug. 1000. 30-jun. 0,4. 1500. 0,6. 1-mei. 0,6. 2000. 2002 - 2004 Keizersveer. 0,8. 1-jan. Discharge (m3/s). 2500. Ortho-phosphate (mg P/l). 0,8. 3000. Ortho-phosphate (mg P/l). 2002 - 2004. 1976 RIWA-M. 30-jun. ortho-phosphate Eijsden. 1-mei. 1975 1977. 2-mrt. Date discharge Eijsden. 27-dec. 0 1-jan. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. 0 1-01-75. 0. 1. 28-okt. 1. 200. 29-aug. 400. 2. 30-jun. 2. 600. 1-mei. 800. 3. 2-mrt. 3. 1000. 4. 2-mrt. Discharge (m3/s). 1200. Ortho-phosphate (mg P/l). 4. Ortho-phosphate (mg P/l). 1975 - 1977 1400. Date 2003 RIWA-M. 2002 2004. 2003 RIWA-M. november 2006.

(40) location. period (Jun-Nov). median orthoPO4 (mg/l). mean orthoPO4 (mg/l). min orthoPO4 (mg/l). max orthoPO4 (mg/l). n. n> 0.05 mg/l RIWA-M. Eijsden. 1975 1976 1977. 0.48 1.19 0.43. 0.57 1.12 0.53. 0.28 0.39 0.19. 1.84 1.70 2.28. 24 26 26. 24 26 26. Eijsden. 2002 2003 2004. 0.24 0.30 0.28. 0.22 0.31 0.30. 0.06 0.10 0.18. 0.39 0.60 0.55. 26 26 27. 26 26 27. Keizersveer. 2002 2003 2004. 0.17 0.16 0.17. 0.19 0.14 0.18. 0.11 0.04 0.13. 0.44 0.19 0.24. 12 12 12. 12 11 12. 2002 - 2004 Eijsden. 2002 - 2004 Eijsden. 0,6. 0,4. 0,2. 0. y = 0,0103x + 0,0578 R2 = 0,2773. Ortho-phosphate (mg P/l). y = 1,2887x -0,4235 R2 = 0,6044. Ortho-phosphate (mg P/l). Ortho-phosphate (mg P/l). 2002 - 2004 Eijsden 0,8. 0,8. 0,8. 0,6. 0,4. 0,2. 500. 1000. 1500. Discharge (m3/s). © Kiwa Water Research. 2000. 2500. 0,4. 0,2. 0. 0 0. 0,6. 0. 5. 10. 15. 20. Water temperature (C). - 32 -. 25. 30. 0. 20. 40. 60. Chlorophyll-a (ug/l. november 2006. 80. 100.

(41) A3.5 Total phosphate. 1-jan. Date. 1,2 0,8 0,4. Date discharge Keizersveer total phosphate Keizersveer. 2002 RIWA-M. - 33 -. 2003 MKE. 27-dec. 28-okt. 29-aug. 0 30-jun. 27-dec. 1,6. 1-mei. Total phosphate (mg P/l). Date. 28-okt. 0 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 0,4. 30-jun. 0,4. 500. 0,8. 1-mei. 1000. 1,2. 2-mrt. 0,8. 1500. © Kiwa Water Research. 2002 - 2004 Keizersveer. 1,6. 1-jan. 1,2. 2000. Total phosphate (mg P/l). Discharge (m3/s). 2500. discharge Eijsden total phosphate Eijsden. 1977 BKMO. 2002 - 2004 Eijsden 1,6. 3000. Total phosphate (mg P/l). 2002 - 2004. 1976 MKE. 2-mrt. 1975 RIWA-M. total phosphate Eijsden. 1-jan. Date discharge Eijsden. 0. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. 0 1-01-75. 0. 0,5 27-dec. 0,5. 200. 1. 28-okt. 1. 400. 1,5. 29-aug. 1,5. 600. 2. 30-jun. 2. 800. 2,5. 1-mei. 2,5. 1000. 3. 2-mrt. 1200. Total phosphate (mg P/l). 1975 - 1977 Eijsden 3. Total phosphate (mg P/l). Discharge (m3/s). 1975 - 1977 1400. Date 2004 BKMO. 2002 RIWA-M. 2003 MKE. 2004 BKMO. november 2006.

(42) median totPO4 (mg/l). mean totPO4 (mg/l). min totPO4 (mg/l). max totPO4 (mg/l). n. n> 0.1 mg/l RIWA-M. n> 0.15 mg/l MKE. n> 0.2 mg/l BKMO. 0 26 26. 0 26 26. 0 26 26. location. period (Jun-Nov). Eijsden. 1975 1976 1977. 1.49 0.64. 1.31 0.76. 0.52 0.45. 1.78 2.60. 0 26 26. Eijsden. 2002 2003 2004. 0.32 0.39 0.40. 0.36 0.42 0.40. 0.15 0.23 0.08. 1.30 0.72 0.73. 26 25 27. 26 25 26. 25 25 26. 24 25 25. Keizersveer. 2002 2003 2004. 0.21 0.21 0.27. 0.21 0.20 0.27. 0.06 0.16 0.21. 0.44 0.25 0.39. 12 12 12. 11 12 12. 10 12 12. 6 6 12. 2002 - 2004 Eijsden Total phosphate (mg P/l). 1,6. 1,2. 0,8. 0,4. 0 0. 500. 1000. 1500. 2000. 2500. Discharge (m3/s). © Kiwa Water Research. - 34 -. november 2006.

(43) Addendum 4a: Total heavy metals and metalloids during droughts A4a.1 Total lead. 1975 - 1977. 1975 - 1977 Eijsden 80. 80. 60. 60. 1000 800. 40. 600 400. 20. Lead (ug/l). 1200. Lead (ug/l). 40 20. 200. 2002 - 2004. 4 0. 4. 2002 2004. - 35 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. 28-okt. 29-aug. Date. Date. Date discharge Keizersveer lead (tot) Keizersveer. 8. 0 30-jun. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 0 28-10-02. 0. 8. 1-mei. 4. Lead (ug/l). 12. 500 20-07-02. 27-dec. 12. 2-mrt. 1000. 11-04-02. 28-okt. 12 8. 1-01-02. 29-aug. 16. 1-jan. 1500. 16. Lead (ug/l). 2000. 2002 - 2004 Keizersveer. 16. Lead (ug/l). Discharge (m3/s). 1976 DWD/RIWA-M. 2002 - 2004 Eijsden. 2500. © Kiwa Water Research. 30-jun. 1975 1977. lead (tot) Eijsden. 3000. discharge Eijsden lead (tot) Eijsden. 1-mei. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 2-mrt. 0. 0 1-01-75. 0. 1-jan. Discharge (m3/s). 1400. 2003 DWD/RIWA-M. 2002 2004. 2003 DWD/RIWA-M. november 2006.

(44) location. period (Jun-Nov). median Pb (µg/l). mean Pb (µg/l). min Pb (µg/l). max Pb (µg/l). n> 10 µg/l DWD/RIWA-M. n> 30 µg/l BKMO. n> 220 µg/l MKE. Eijsden. 1975 1976 1977. 4.0 8.0. 6.4 14.5. 1.0 2.0. 23.0 70.0. 0 12 13. 2 6. 0 1. 0 0. Eijsden. 2002 2003 2004. 2.4 1.8 1.8. 5.8 1.8 1.8. 1.1 0.2 0.6. 47.0 3.0 3.7. 26 26 27. 3 0 0. 1 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 1.0 2.0 2.0. 3.0 1.9 2.7. 1.0 1.0 1.0. 12.0 4.0 9.0. 7 7 7. 1 0 0. 0 0 0. 0 0 0. n. 2002 - 2004 Eijsden 16 y = 0,295x 0,4572 R2 = 0,4039. Lead (ug/l). 12. 8. 4. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 36 -. november 2006.

(45) A4a.2 Total copper 1975 - 1977. 1975 - 1977 Eijsden 25. 20. 20. 5. 0 1-jan. 27-09-77. Date MKE. RIWA-M. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 25. 2500. 20. 20. 20. 5 0. © Kiwa Water Research. discharge Keizersveer copper (tot) Keizersveer. 10 5. 2002. 2003. MKE. RIWA-M. - 37 -. 27-dec. 1-jan. 27-dec. 29-aug. 28-okt. Date. Date. Date discharge Eijsden copper (tot) Eijsden. 15. 0 30-jun. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 0 28-10-02. 0 20-07-02. 5. 11-04-02. 500. 10. 1-mei. 10. 1000. 15. 2-mrt. 15. 1500. 1-jan. 2000. Copper (ug/l). 25. Copper (ug/l). 25. Copper (ug/l). 3000. 1-01-02. Discharge (m3/s). 2002 - 2004. 1977. 28-okt. copper (tot) Eijsden. 1976. 29-aug. discharge Eijsden. 1975. 30-jun. Date. 1-mei. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. 0 1-01-75. 0. 5. 2-mrt. 200. 27-dec. 400. 10. 28-okt. 10. 29-aug. 600. 15. 30-jun. 15. 1-mei. 800. 2-mrt. 1000. Copper (ug/l). 1200. 25. Copper (ug/l). Discharge (m3/s). 1400. 2004. 2002. 2003. MKE. RIWA-M. 2004. november 2006.

(46) location. period (Jun-Nov). median Cu (µg/l). mean Cu (µg/l). min Cu (µg/l). max Cu (µg/l). n. n> 3.8 µg/l MKE. n> 15 µg/l RIWA-M. n> 50 µg/l BKMO. n> 2000 µg/l DWD. Eijsden. 1975 1976 1977. 8.5 6.0 6.0. 9.4 6.8 8.1. 5.0 3.0 4.0. 19.0 14.0 21.0. 14 12 11. 1 11 11. 2 0 1. 0 0 0. 0 0 0. Eijsden. 2002 2003 2004. 3.4 3.4 3.1. 5.6 3.8 3.4. 1.4 1.9 1.8. 31.0 8.8 5.9. 26 26 27. 20 25 27. 2 0 0. 0 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 4.0 4.0 4.0. 3.9 3.4 4.1. 3.0 2.0 3.0. 5.0 4.0 7.0. 7 7 7. 7 7 7. 0 0 0. 0 0 0. 0 0 0. 2002 - 2004 Eijsden 25. Copper (ug/l). 20 15 10 5 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 38 -. november 2006.

(47) A4a.3 Total zinc 1975 - 1977. 1975 - 1977 Eijsden 800. 800. 600. 600. 1000 800. 400. 600 400. 200. Zinc (ug/l). 1200. Zinc (ug/l). 400 200. 200. zinc (tot) Eijsden. 27-dec. 28-okt. 29-aug. 30-jun. 1975. 1976. MKE. RIWA-M. 2002 - 2004. 1977. 2002 - 2004 Eijsden. 1500. 200. 150. 150. 150. 100. 1000. 50. 500. 100. 100. 50. 50. 0. 0. © Kiwa Water Research. discharge Keizersveer zinc (tot) Keizersveer. 2002. 2003. MKE. RIWA-M. - 39 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. 29-aug. 30-jun. 1-mei. 28-okt. Date. Date. Date discharge Eijsden zinc (tot) Eijsden. 2-mrt. 1-jan. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. Zinc (ug/l). 2000. 200. Zinc (ug/l). 2500. 2002 - 2004 Keizersveer. 200. Zinc (ug/l). 3000. Discharge (m3/s). 1-mei. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 2-mrt. 0. 0 1-01-75. 0. 1-jan. Discharge (m3/s). 1400. 2004. 2002. 2003. MKE. RIWA-M. 2004. november 2006.

(48) location. period (Jun-Nov). median Zn (µg/l). mean Zn (µg/l). min Zn (µg/l). max Zn (µg/l). n. n> 40 µg/l MKE. n> 100 µg/l RIWA-M. n> 200 µg/l BKMO. n> 3000 µg/l BKMO. Eijsden. 1975 1976 1977. 249 50 115. 423 64 146. 55 20 45. 1972 186 440. 14 12 13. 1 11 13. 12 2 8. 8 0 2. 0 0 0. Eijsden. 2002 2003 2004. 24 24 15. 42 27 17. 10 13 5. 261 47 29. 23 26 27. 16 21 18. 2 0 0. 1 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 19 20 21. 25 21 26. 16 17 16. 57 26 54. 7 7 7. 5 4 6. 0 0 0. 0 0 0. 0 0 0. 2002 - 2004 Eijsden 200. Zinc (ug/l). 150. 100. 50. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 40 -. november 2006.

(49) A4a.4 Total nickel 1975 - 1977. 1975 - 1977 Eijsden 20. 20. 15. 15. 1000 800. 10. 600 400. 5. Nickel (ug/l). 1200. Nickel (ug/l). 10 5. 200. 1976. MKE. RIWA-M. 2002 - 2004. 5 0. 5. 2002. 2003. MKE. RIWA-M. - 41 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 1-jan. 27-dec. 29-aug. 28-okt. Date. Date. Date discharge Keizersveer nickel (tot) Keizersveer. 10. 0 30-jun. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 0 28-10-02. 0. 10. 1-mei. 10. Nickel (ug/l). 15. 500 20-07-02. 27-dec. 15. 2-mrt. 1000. 11-04-02. 28-okt. 30 20. 1-01-02. 29-aug. 20. 1-jan. 1500. 20. Nickel (ug/l). 2000. 2002 - 2004 Keizersveer. 40. Nickel (ug/l). Discharge (m3/s). 1977. 2002 - 2004 Eijsden. 2500. © Kiwa Water Research. 30-jun. 1975. 2-mrt. nickel (tot) Eijsden. 3000. discharge Eijsden nickel (tot) Eijsden. 1-mei. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 2-mrt. 0. 0 1-01-75. 0. 1-jan. Discharge (m3/s). 1400. 2004. 2002. 2003. MKE. RIWA-M. 2004. november 2006.

(50) location. period (Jun-Nov). median Ni (µg/l). mean Ni (µg/l). min Ni (µg/l). max Ni (µg/l). n. n> 6.3 µg/l MKE. n> 10 µg/l RIWA-M. n> 20 µg/l DWD. Eijsden. 1975 1976 1977. 5.0 7.0 6.0. 5.9 7.3 8.4. 4.0 4.0 4.0. 11.0 12.0 17.0. 14 12 11. 0 7 8. 1 1 3. 0 0 0. Eijsden. 2002 2003 2004. 3.5 4.3 3.2. 6.1 4.9 3.6. 1.3 2.5 0.5. 33.0 12.0 11.0. 26 26 27. 7 8 2. 3 1 1. 0 0 0. Keizersveer. 2002 2003 2004. 4.0 5.0 4.0. 4.4 4.7 4.4. 3.0 4.0 3.0. 7.0 5.0 6.0. 7 7 7. 1 0 1. 0 0 0. 0 0 0. 2002 - 2004 Eijsden 20. Nickel (ug/l). 15. 10. 5. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 42 -. november 2006.

(51) A4a.5 Total mercury 1975 - 1977. 1975 - 1977 Eijsden 1,6. 1200 1,2. 1000 800. 0,8. 600 400. 0,4. Mercury (ug/l). 1,6. Mercury (ug/l). 1,2 0,8 0,4. 200 27-dec. 28-okt. 29-aug. 30-jun. 1976. RIWA-M. BKMO. 1977. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 0,25. 2500. 0,2. 0,2. 0,2. 0. © Kiwa Water Research. discharge Keizersveer mercury (tot) Keizersveer. 0,1 0,05. 2002. 2003. RIWA-M. BKMO. - 43 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 1-jan. 27-dec. 28-okt. Date. Date. Date discharge Eijsden mercury (tot) Eijsden. 0,15. 0 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 0,05. 30-jun. 0,05. 500. 0,1. 1-mei. 0,1. 1000. 0,15. 2-mrt. 0,15. 1500. 1-jan. 2000. Mercury (ug/l). 0,25. Mercury (ug/l). 0,25. Mercury (ug/l). 3000. 2-mrt. mercury (tot) Eijsden. 1975. 2002 - 2004 Discharge (m3/s). 1-mei. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 2-mrt. 0. 0 1-01-75. 0. 1-jan. Discharge (m3/s). 1400. 2004. 2002. 2003. RIWA-M. BKMO. 2004. november 2006.

(52) mean Hg (µg/l). min Hg (µg/l). max Hg (µg/l). n. n> 0.1 µg/l RIWA-M. n> 0.3 µg/l BKMO. n> 1.0 µg/l DWD. n> 1.2 µg/l MKE. location. period (Jun-Nov). median Hg (µg/l). Eijsden. 1975 1976 1977. 0.200 0.100 0.200. 0.214 0.083 0.258. 0.000 0.000 0.000. 0.500 0.300 0.900. 14 12 12. 8 2 8. 4 0 4. 0 0 0. 0 0 0. Eijsden. 2002 2003 2004. 0.007 0.004 0.008. 0.019 0.004 0.011. 0.001 0.001 0.002. 0.145 0.011 0.069. 25 25 27. 2 0 0. 0 0 0. 0 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 0.020 0.030 0.030. 0.021 0.024 0.030. 0.010 0.010 0.030. 0.030 0.030 0.030. 7 7 7. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 2002 - 2004 Eijsden 0,25. Mercury (ug/l). 0,2 0,15 0,1 0,05 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 44 -. november 2006.

(53) A4a.6 Total chrome 1975 - 1977 Eijsden 60. 1200. 50. 50. 0. Date 1975 1977 BKMO/DWD. 2002 - 2004. 2002 - 2004 Eijsden. Chrome (ug/l). 0. © Kiwa Water Research. 8 4. 2002 2004 BKMO/DWD. - 45 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-jan. 27-dec. Date. Date. Date discharge Keizersveer chrome (tot) Keizersveer. 12. 0 28-okt. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 4. 29-aug. 4. 500. 30-jun. 1000. 8. 1-mei. 8. 2-mrt. 1500. 12. 1-jan. 12. 2000. Chrome (ug/l). 2500. 2002 - 2004 Keizersveer 16. 16. 16. Chrome (ug/l). Discharge (m3/s). 3000. discharge Eijsden chrome (tot) Eijsden. 1976 RIWA-M. 1-mei. chrome (tot) Eijsden. 2-mrt. Date discharge Eijsden. 27-dec. 0. 28-okt. 10. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. 1-01-75. 0. 10. 29-aug. 200. 20. 30-jun. 20. 400. 30. 1-mei. 30. 600. 40. 2-mrt. 40. 800. 1-jan. 1000. Chrome (ug/l). 60. Chrome (ug/l). Discharge (m3/s). 1975 - 1977 1400. 2003 RIWA-M. 2002 2004 BKMO/DWD. 2003 RIWA-M. november 2006.

(54) location. period (Jun-Nov). median Cr (µg/l). mean Cr (µg/l). min Cr (µg/l). max Cr (µg/l). n. n> 2 µg/l RIWA-M. n> 50 µg/l BKMO/DWD. n> 84 µg/l MKE/WFD(06). Eijsden. 1975 1976 1977. 6.0 3.0 7.0. 8.1 4.9 9.2. 3.0 1.0 2.0. 28.0 24.0 27.0. 14 12 13. 14 7 12. 0 0 0. 0 0 0. Eijsden. 2002 2003 2004. 1.5 0.8 1.0. 4.2 0.9 1.1. 0.1 0.1 0.5. 43.0 2.9 2.3. 25 26 27. 10 1 1. 0 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 1.0 1.0 1.0. 1.6 1.3 1.4. 1.0 1.0 1.0. 5.0 2.0 4.0. 7 7 7. 1 0 1. 0 0 0. 0 0 0. 2002 - 2004 Eijsden 16 y = 0,0983x 0,55 R2 = 0,3661. Chrome (ug/l). 12. 8. 4. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 46 -. november 2006.

(55) A4a.7 Total cadmium 1975 - 1977. 1975 - 1977 Eijsden 16. 0 1-jan. 27-09-77. Date 1977. RIWA-M. BKMO. MKE. 2002 - 2004. 2002 - 2004 Eijsden Cadmium (ug/l). 0. © Kiwa Water Research. discharge Keizersveer cadmium (tot) Keizersveer. 2 1. 2002. 2003. 2004. 2002. 2003. 2004. RIWA-M. BKMO. MKE. RIWA-M. BKMO. MKE. - 47 -. 27-dec. 28-okt. 29-aug. 1-jan. Date. Date. Date discharge Eijsden cadmium (tot) Eijsden. 3. 0 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 1. 28-okt. 1. 500. 29-aug. 1000. 2. 30-jun. 2. 1-mei. 1500. 3. 1-jan. 3. 2000. Cadmium (ug/l). 2500. 2002 - 2004 Keizersveer 4. 4. 4. Cadmium (ug/l). Discharge (m3/s). 3000. 30-jun. cadmium (tot) Eijsden. 1976. 2-mrt. discharge Eijsden. 1975. 1-mei. Date. 2-mrt. 19-06-77. 11-03-77. 01-12-76. 23-08-76. 15-05-76. 05-02-76. 28-10-75. 20-07-75. 11-04-75. 0 01-01-75. 0. 4. 27-dec. 4. 200. 28-okt. 400. 8. 29-aug. 8. 600. 30-jun. 800. 12. 1-mei. 12. 1000. 2-mrt. 1200. Cadmium (ug/l). 16. Cadmium (ug/l). Discharge (m3/s). 1400. november 2006.

(56) median mean Cd Cd (µg/l) (µg/l). min Cd (µg/l). max Cd (µg/l). n. n> 0.5 µg/l RIWA-M. n> 1.5 µg/l BKMO. n> 2 µg/l MKE. n> 5 µg/l DWD. 2.4 1.5 1.6. 0.6 0.1 0.3. 5.8 7.0 4.9. 14 12 13. 14 7 12. 7 4 6. 1 6 8. 0 0 0. 0.1 0.1 0.2. 0.3 0.1 0.2. 0.1 0.1 0.1. 1.7 0.2 0.3. 26 26 27. 3 0 0. 1 0 0. 0 0 0. 0 0 0. 0.1 0.1 0.1. 0.2 0.1 0.1. 0.1 0.1 0.1. 0.4 0.2 0.2. 7 7 7. 0 0 0. 0 0 0. 0 0 0. 0 0 0. location. period (Jun-Nov). Eijsden. 1975 1976 1977. 1.5 0.8 1.3. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. 2002 - 2004 Eijsden 4 y = 0,0294x 0,3925 R2 = 0,2945. Cadmium (ug/l). 3,5 3 2,5 2 1,5 1 0,5 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 48 -. november 2006.

(57) A4a.8 Total arsenic 1975 - 1977. 1975 - 1977 Eijsden 20. 1200 15. 1000 800. 10. 600 400. 5. Arsenic (ug/l). 20. Arsenic (ug/l). 15 10 5. 200. 2002 - 2004. Arsenic (ug/l). 2. 2. 2002. 2003. 2002. 2003. 2004. RIWA-M. 2004. RIWA-M. - 49 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 28-okt. 27-dec. Date. Date. Date discharge Keizersveer arsenic (tot) Keizersveer. 4. 0. 0 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 0 28-10-02. 0. 4. 30-jun. 2. 500 20-07-02. 27-dec. 6. 1-mei. 1000. 11-04-02. 28-okt. 6. 4. 1-01-02. 29-aug. 6. 2-mrt. 1500. 8. 1-jan. 2000. 8. Arsenic (ug/l). 2500. 2002 - 2004 Keizersveer. 8. Arsenic (ug/l). Discharge (m3/s). 1976 RIWA-M. 2002 - 2004 Eijsden. 3000. © Kiwa Water Research. 30-jun. 1975 1977 DWD. arsenic (tot) Eijsden. discharge Eijsden arsenic (tot) Eijsden. 1-mei. 27-09-77. 19-06-77. 11-03-77. 1-12-76. 23-08-76. 15-05-76. 5-02-76. 28-10-75. 20-07-75. 11-04-75. Date. Date discharge Eijsden. 2-mrt. 0. 0 1-01-75. 0. 1-jan. Discharge (m3/s). 1400. november 2006.

(58) location. period (Jun-Nov). median As (µg/l). mean As (µg/l). min As (µg/l). max As (µg/l). n. n> 2 µg/l RIWA-M. n> 10 µg/l DWD. n> 20 µg/l BKMO. n> 32 µg/l MKE. Eijsden. 1975 1976 1977. 3.5 3.0 3.0. 4.1 3.9 3.3. 1.0 2.0 3.0. 11.0 9.0 4.0. 14 12 11. 11 9 11. 1 0 0. 0 0 0. 0 0 0. Eijsden. 2002 2003 2004. 2.1 2.4 1.7. 2.8 2.4 1.9. 1.3 1.7 1.3. 16.0 4.2 4.0. 26 24 27. 13 18 9. 1 0 0. 0 0 0. 0 0 0. Keizersveer. 2002 2003 2004. 0.1 0.1 0.1. 0.2 0.1 0.1. 0.1 0.1 0.1. 0.4 0.2 0.2. 7 7 7. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 2002 - 2004 Eijsden 8. Arsenic (ug/l). 6. 4. 2. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 50 -. november 2006.

(59) A4a.9 Total selenium. 2002 - 2004. 2002 - 2004 Eijsden. Date discharge Eijsden. © Kiwa Water Research. selenium (tot) Eijsden. 27-dec. 28-okt. 0 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0 1-01-02. 0. 0,4. 30-jun. 0,4 500. 1-mei. 1000. 0,8. 2-mrt. 0,8. 1500. 1,2. 1-jan. 1,2. 2000. Selenium (ug/l). 2500. Selenium (ug/l). Discharge (m3/s). 1,6. 1,6. 3000. Date 2002. 2003. 2004. RIWA-M. - 51 -. november 2006.

(60) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Se (µg/l). mean Se (µg/l). min Se (µg/l). max Se (µg/l). n. n> 1 µg/l RIWA-M. n> 10 µg/l BKMO/DWD. n> 5.4 µg/l MKE. 0 1 0. 0 0 0. 0 0 0. 0 0 0 0.3 0.5 0.3. 0.3 0.5 0.3. 0.0 0.0 0.1. 0.7 1.2 0.9. 7 7 7 0 0 0. 2002 - 2004 Eijsden. Selenium (ug/l). 1,6 y = 1,6147x -0,5051 R2 = 0,1436. 1,2. 0,8. 0,4. 0 0. 500. 1000. 1500. 2000. 2500. Discharge (m3/s). © Kiwa Water Research. - 52 -. november 2006.

(61) A4a.10 Total barium. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 60. 2500. 50. 50. 50. 2000. 40. 1500. 30. 1000. 20. 500. 10. © Kiwa Water Research. 2002. - 53 -. 2003. 27-dec. 28-okt. Date. Date discharge Keizersveer barium (tot) Keizersveer. 29-aug. 1-jan. 27-dec. 28-okt. 29-aug. 0. 30-jun. 0. 1-mei. 10. 2-mrt. 10. Date discharge Eijsden barium (tot) Eijsden. 20. 30-jun. 20. 30. 1-mei. 30. 40. 2-mrt. 40. 1-jan. 27-09-04. 19-06-04. 11-03-04. 02-12-03. 24-08-03. 16-05-03. 05-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 01-01-02. 0. Barium (ug/l). 60. Barium (ug/l). 60. Barium (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2004. 2002. 2003. 2004. november 2006.

(62) median Ba (µg/l). mean Ba (mg/l). min Ba (µg/l). max Ba (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 24.9 26.3 22.1. 24.4 27.0 22.9. 18.5 24.4 21.8. 26.7 31.7 25.4. Keizersveer. 2002 2003 2004. 30.0 31.0 29.0. 31.6 30.6 28.6. 28.0 28.0 26.0. 44.0 32.0 30.0. n> 200 µg/l BKMO. n> 230 µg/l MKE. 7 6 7. 0 0 0. 0 0 0. 7 7 7. 0 0 0. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden 60. Barium (ug/l). 50 40 30 20 10 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 54 -. november 2006.

(63) Addendum A4b: Dissolved heavy metals during droughts A4b.1 Dissolved lead. 2002 - 2004 Eijsden. 0. Date discharge Eijsden. © Kiwa Water Research. 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,5. 28-okt. 0,5. 500. 1. 29-aug. 1. 1000. 1,5. 30-jun. 1,5. 1500. 1-mei. 2000. 2. 2-mrt. 2. 1-jan. 2500. 2,5. Lead (diss) (ug/l). 2,5. Lead (diss) (ug/l). Discharge (m3/s). 2002 - 2004 3000. Date lead (diss) Eijsden. 2002. - 55 -. 2003. 2004. november 2006.

(64) location. summer (Jun-Nov). Eijsden. 1975 1976 1977 2002 2003 2004. Eijsden. Keizersveer. median Pb (diss) (µg/l). 0.1 0.1 0.1. mean Pb (diss) (µg/l). 0.2 0.2 0.2. min Pb (diss) (µg/l). 0.1 0.1 0.1. max Pb (diss) (µg/l). 2.1 1.2 1.1. 2002 2003 2004. n 0 0 0 25 23 27 0 0 0. 2002 - 2004 Eijsden 2,5. Lead (diss) (ug/l). 2 1,5 1 0,5 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 56 -. november 2006.

(65) A4b.2 Dissolved copper. 2002 - 2004. 2002 - 2004 Eijsden 8. 0. Date. Date discharge Eijsden. © Kiwa Water Research. copper (diss) Eijsden. 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 2. 28-okt. 2 500. 29-aug. 1000. 4. 30-jun. 4. 1-mei. 1500. 6. 2-mrt. 6 2000. 1-jan. 2500. Copper (diss) (ug/l). 8. Copper (diss) (ug/l). Discharge (m3/s). 3000. 2002. - 57 -. 2003. 2004. november 2006.

(66) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Cu (diss) (µg/l). mean Cu (diss) (µg/l). min Cu (diss) (µg/l). max Cu (diss) (µg/l). n 0 0 0. 2.1 2.4 1.7. 2.8 2.4 1.9. 1.3 1.7 1.3. 16.0 4.2 4.0. 26 24 27 0 0 0. 2002 - 2004 Eijsden. Copper (diss) (ug/l). 8. 6. 4. 2. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 58 -. november 2006.

(67) A4b.3 Dissolved zinc. 2002 - 2004. 2002 - 2004 Eijsden 80. 0. 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 20. 28-okt. 20 500. 29-aug. 1000. 40. 30-jun. 40. 1-mei. 1500. 60. 2-mrt. 60 2000. 1-jan. 2500. Zinc (diss) (ug/l). 80. Zinc (diss) (ug/l). Discharge (m3/s). 3000. Date. Date discharge Eijsden. © Kiwa Water Research. zinc (diss) Eijsden. 2002. - 59 -. 2003. 2004. november 2006.

(68) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Zn (diss) (µg/l). mean Zn (diss) (µg/l). min Zn (diss) (µg/l). max Zn (diss) (µg/l). n 0 0 0. 9 10 7. 10 14 10. 3 5 1. 50 44 62. 25 24 27 0 0 0. 2002 - 2004 Eijsden. Zinc (diss) (ug/l). 80. 60. 40. 20. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 60 -. november 2006.

(69) A4b.4 Dissolved nickel. 2002 - 2004 Eijsden. 5. 0. 0. 20 15 10 5. discharge Eijsden. © Kiwa Water Research. 27-dec. 28-okt. 30-jun. 29-aug. Date. 1-mei. 2-mrt. 0. 1-jan. Nickel (diss) (ug/l). 500. Nickel (diss) (ug/l). 10. 27-09-04. 1000. 19-06-04. 15. 11-03-04. 1500. 2-12-03. 20. 24-08-03. 2000. 16-05-03. 25. 5-02-03. 25. 28-10-02. 2500. 20-07-02. 30. 11-04-02. 30. 1-01-02. Discharge (m3/s). 2002 - 2004 3000. Date nickel (diss) Eijsden. 2002. - 61 -. 2003. 2004. november 2006.

(70) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Ni (diss) (µg/l). mean Ni (diss) (µg/l). min Ni (diss) (µg/l). max Ni (diss) (µg/l). n 0 0 0. 3 5 3. 5 5 3. 1 3 2. 30 13 12. 24 24 27 0 0 0. 2002 - 2004 Eijsden 35 y = 17,553x -0,4198 R2 = 0,3843. Nickel (diss) (ug/l). 30 25 20 15 10 5 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 62 -. november 2006.

(71) A4b.5 Dissolved mercury. 2002 - 2004 Eijsden. 500. 0,002. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,006 0,004 0,002 0. Date discharge Eijsden mercury(diss) Eijsden. © Kiwa Water Research. 27-dec. 0,004. 28-okt. 0,006. 1000. 29-aug. 1500. 0,008. 30-jun. 0,008. 1-mei. 2000. 0,01. 2-mrt. 0,01. 1-jan. 2500. 0,012. Mercury (diss) (ug/l). 0,012. Mercury (diss) (ug/l). Discharge (m3/s). 2002 - 2004 3000. Date discharge Keizersveer mercury (diss) Keizersveer. 2002. - 63 -. 2003. 2004. november 2006.

(72) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Hg (diss) (µg/l). mean Hg (diss) (µg/l). min Hg (diss) (µg/l). max Hg (diss) (µg/l). n. n> 0.07 (µg/l) WFD(06). 0 0 0 0.00 0.00 0.00. 0.00 0.00 0.00. 0.00 0.00 0.00. 0.01 0.00 0.01. 26 25 27. 0 0 0. 0 0 0. 2002 - 2004 Eijsden. Mercury (diss) (ug/l). 0,012 0,01 0,008 0,006 0,004 0,002 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 64 -. november 2006.

(73) A4b.6 Dissolved chrome. 2002 - 2004 Eijsden 5 4 3 2 1. © Kiwa Water Research. 27-dec. 28-okt. 29-aug. 30-jun. Date. Date discharge Eijsden. 1-mei. 2-mrt. 0. 1-jan. 0. Chrome (diss) (ug/l). 0. 6. Chrome (diss) (ug/l). 1. 27-09-04. 500. 19-06-04. 2. 11-03-04. 1000. 2-12-03. 3. 24-08-03. 1500. 16-05-03. 4. 5-02-03. 2000. 28-10-02. 5. 20-07-02. 2500. 11-04-02. 6. 1-01-02. Discharge (m3/s). 2002 - 2004 3000. chrome (diss) Eijsden. 2002. - 65 -. 2003. 2004. november 2006.

(74) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Cr (diss) (µg/l). mean Cr (diss) (µg/l). min Cr (diss) (µg/l). max Cr (diss) (µg/l). n 0 0 0. 1.0 1.1 0.5. 1.2 1.6 0.6. 0.3 0.3 0.5. 2.7 5.7 1.2. 25 24 27 0 0 0. 2002 - 2004 Eijsden. Chrome (diss) (ug/l). 6 y = 2,0022x -0,2072 R2 = 0,1129. 5 4 3 2 1 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 66 -. november 2006.

(75) A4b.7 Dissolved cadmium. 2002 - 2004. 2002 - 2004 Eijsden 0,4. 0. Date discharge Eijsden. © Kiwa Water Research. 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,1. 28-okt. 0,1 500. 0,2. 29-aug. 1000. 30-jun. 0,2. 1-mei. 1500. 0,3. 2-mrt. 0,3. 2000. 1-jan. 2500. Cadmium (diss) (ug/l). 0,4. Cadmium (diss) (ug/l). Discharge (m3/s). 3000. Date cadmium (diss) Eijsden. 2002. - 67 -. 2003. 2004. november 2006.

(76) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Cd (diss) (µg/l). mean Cd (diss) (µg/l). min Cd (diss) (µg/l). max Cd (diss) (µg/l). n. n> 1.5 µg/l WFD(06). 0 0 0 0.1 0.1 0.1. 0.1 0.1 0.1. 0.1 0.1 0.1. 0.2 0.1 0.2. 26 24 27. 0 0 0. 0 0 0. 2002 - 2004 Eijsden 1,6. Cadmium (diss) (ug/l). 1,4 1,2 1 0,8 0,6 0,4 0,2 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 68 -. november 2006.

(77) Addendum A5a: Polycyclic aromatic hydrocarbons (PAHs) during droughts A5a.1 Benzo(a)pyrene. Benzo(a)pyrene (ug/l). 0. © Kiwa Water Research. discharge Keizersveer benzo(a)pyrene Keizersveer. 0,08 0,06 0,04 0,02. 2002. 2003. DWD. RIWA-M. - 69 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. Date. Date. Date discharge Eijsden benzo(a)pyrene (tot) Eijsden. 0,1. 0. 28-okt. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,02. 29-aug. 0,02. 500. 0,04. 30-jun. 0,04. 1000. 0,06. 1-mei. 0,06. 1500. 0,08. 2-mrt. 0,08. 2000. 2002 - 2004 Keizersveer. 0,1. 1-jan. 2500. Benzo(a)pyrene (ug/l). 2002 - 2004 Eijsden 0,1. Benzo(a)pyrene (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2004. 2002. 2003. DWD. RIWA-M. 2004. november 2006.

(78) median B(a)pyr (µg/l). mean B(a)pyr (µg/l). min B(a)pyr (µg/l). max B(a)pyr (µg/l). n. n> 0.01 µg/l DWD. n> 0.05 µg/l RIWA-M. n> 0.1 µg/l WFD(06). n> 0.2µg/l BKMO. n> 0.2 µg/l MKE. location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.010 0.010 0.020. 0.023 0.014 0.024. 0.010 0.010 0.010. 0.080 0.030 0.050. 7 7 7. 2 2 4. 1 0 0. 0 0 0. 0 0 0. 1 0 0. Keizersveer. 2002 2003 2004. 0.010 0.010 0.010. 0.010 0.010 0.010. 0.010 0.010 0.010. 0.010 0.010 0.010. 12 4 7. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 2002 - 2004 Eijsden. Benzo(a)pyrene (ug/l). 0,1 0,08 0,06 0,04 0,02 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 70 -. november 2006.

(79) A5a.2 Fluoranthene. 2002 - 2004 Eijsden Fluoranthene (ug/l). 0. © Kiwa Water Research. 0,15 0,1 0,05. 2002 RIWA-M. - 71 -. 2003 BKMO. 27-dec. 28-okt. 29-aug. 30-jun. Date. Date discharge Keizersveer fluoranthene Keizersveer. 1-mei. 2-mrt. 0. Date discharge Eijsden fluoranthene Eijsden. 0,2. 1-jan. 27-09-04. 19-06-04. 11-03-04. 02-12-03. 24-08-03. 16-05-03. 05-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 01-01-02. 0. 0,05. 27-dec. 500. 28-okt. 0,05. 0,1. 29-aug. 0,1. 1000. 0,15. 30-jun. 0,15. 1500. 1-mei. 2000. 0,2. 2-mrt. 0,2. 1-jan. 2500. 2002 - 2004 Keizersveer 0,25. 0,25. Fluoranthene (ug/l). 0,25. Fluoranthene (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2004. 2002 RIWA-M. 2003 BKMO. 2004. november 2006.

(80) median F-anth (µg/l). mean F-anth (µg/l). min F-anth (µg/l). max F-anth (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.010 0.010 0.020. 0.047 0.013 0.016. 0.010 0.010 0.010. 0.210 0.030 0.020. Keizersveer. 2002 2003 2004. 0.010 0.010 0.010. 0.011 0.010 0.014. 0.010 0.010 0.010. 0.017 0.010 0.040. n> 0.05 µg/l RIWA-M. n> 0.2 µg/l BKMO. n> 0.5 µg/l MKE. n> 1 µg/l WFD(06). 7 7 7. 2 0 0. 1 0 0. 0 0 0. 0 0 0. 12 8 7. 0 0 0. 0 0 0. 0 0 0. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden. Fluoranthene (ug/l). 0,25 0,2 0,15 0,1 0,05 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 72 -. november 2006.

(81) Addendum A5b: Pesticides during droughts A5b.1 Atrazine. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 0,25. 2500. 0,2. 0,2. 0,2. 0. © Kiwa Water Research. discharge Keizersveer atrazine Keizersveer. 0,1 0,05. 2002 2004 BKMO/DWD. - 73 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. 28-okt. Date. Date. Date discharge Eijsden atrazine Eijsden. 0,15. 0. 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,05. 30-jun. 0,05. 500. 0,1. 1-mei. 0,1. 1000. 0,15. 2-mrt. 0,15. 1500. 1-jan. 2000. Atrazine (ug/l). 0,25. Atrazine (ug/l). 0,25. Atrazine (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2003 RIWA-M. 2002 2004 BKMO/DWD. 2003 RIWA-M. november 2006.

(82) median atraz (µg/l). mean atraz (µg/l). min atraz (µg/l). max atraz (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.08 0.04 0.04. 0.08 0.08 0.05. 0.02 0.02 0.01. 0.19 0.22 0.08. Keizersveer. 2002 2003 2004. 0.08 0.06 0.03. 0.09 0.07 0.03. 0.03 0.03 0.01. 0.16 0.12 0.07. n> 0.05 µg/l RIWA-M. n> 0.1 µg/l BKMO/DWD. n> 2 µg/l WFD(06). n> 2.4 µg/l MKE. 7 7 6. 5 3 2. 1 2 0. 0 0 0. 0 0 0. 10 7 7. 7 4 1. 3 2 0. 0 0 0. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden 0,25 y = 0,1738x -0,342 R2 = 0,2153. Atrazine (ug/l). 0,2 0,15 0,1 0,05 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 74 -. november 2006.

(83) A5b.2 Simazine. 2002 - 2004. 2002 - 2004 Eijsden Simazine (ug/l). 0. © Kiwa Water Research. 0,08 0,04. discharge Keizersveer simazine Keizersveer. 2002 2004 BKMO/DWD. - 75 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. 28-okt. Date. Date. Date discharge Eijsden simazine Eijsden. 0,12. 0. 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,04. 30-jun. 0,04. 500. 0,08. 1-mei. 0,08. 1000. 2-mrt. 1500. 0,12. 1-jan. 0,12. 2000. Simazine (ug/l). 2500. 2002 - 2004 Keizersveer 0,16. 0,16. 0,16. Simazine (ug/l). Discharge (m3/s). 3000. 2003 RIWA-M MKE. 2002 2004 BKMO/DWD. 2003 RIWA-M MKE. november 2006.

(84) median simaz (µg/l). mean simaz (µg/l). min simaz (µg/l). max simaz (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.02 0.02 0.02. 0.04 0.02 0.02. 0.01 0.01 0.01. 0.12 0.04 0.04. Keizersveer. 2002 2003 2004. 0.05 0.04 0.03. 0.05 0.04 0.03. 0.04 0.03 0.01. 0.06 0.07 0.04. n> 0.05 µg/l RIWA-M. n> 0.1 µg/l BKMO/DWD. n> 0.14 µg/l MKE. n> 4 µg/l WFD(06). 7 7 6. 2 0 0. 1 0 0. 0 0 0. 0 0 0. 10 7 7. 2 1 0. 0 0 0. 0 0 0. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden 0,16. Simazine (ug/l). y = 0,0491x -0,2288 R2 = 0,1474 0,12. 0,08. 0,04. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 76 -. november 2006.

(85) A5b.3 Diuron. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 0,6. 2500. 0,5. 0,5. 0,5. 2000. 0,4. 1500. 0,3. 1000. 0,2. 500. 0,1. © Kiwa Water Research. discharge Keizersveer diuron Keizersveer. - 77 -. 27-dec. 28-okt. 29-aug. Date. Date 2002 2004 BKMO/DWD. 30-jun. 27-dec. 28-okt. 29-aug. 0. 30-jun. 0. 1-mei. 0,1. 2-mrt. 0,1. Date discharge Eijsden diuron Eijsden. 0,2. 1-mei. 0,2. 0,3. 2-mrt. 0,3. 0,4. 1-jan. 0,4. 1-jan. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. Diuron (ug/l). 0,6. Diuron (ug/l). 0,6. Diuron (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2003 RIWA-M MKE. 2002 2004 BKMO/DWD. 2003 RIWA-M MKE. november 2006.

(86) median diuron (µg/l). mean diuron (µg/l). min diuron (µg/l). max diuron (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.33 0.25 0.15. 0.27 0.25 0.14. 0.02 0.06 0.06. 0.45 0.52 0.21. Keizersveer. 2002 2003 2004. 0.23 0.15 0.16. 0.22 0.15 0.14. 0.04 0.07 0.07. 0.33 0.21 0.17. n> 0.05 µg/l RIWA-M. n> 0.1 µg/l BKMO/DWD. n> 0.43 µg/l MKE. n> 1.8 µg/l WFD(06). 7 7 7. 6 7 7. 5 6 5. 2 1 0. 0 0 0. 10 7 7. 9 7 7. 9 5 5. 0 0 0. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden 0,6 y = 1,7247x -0,6275 R2 = 0,3477. Diuron (ug/l). 0,5 0,4 0,3 0,2 0,1 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 78 -. november 2006.

(87) A5b.4 Isoproturon. 2002 - 2004 Eijsden Isoproturon (ug/l). 0. © Kiwa Water Research. discharge Keizersveer isoproturon Keizersveer. 0,15 0,1 0,05. - 79 -. 27-dec. 28-okt. 29-aug. Date. Date 2002 2004 BKMO/DWD. 30-jun. 1-mei. 2-mrt. 0. Date discharge Eijsden isoproturon Eijsden. 0,2. 1-jan. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,05. 27-dec. 500. 28-okt. 0,05. 0,1. 29-aug. 0,1. 1000. 0,15. 30-jun. 0,15. 1500. 1-mei. 2000. 0,2. 2-mrt. 0,2. 1-jan. 2500. 2002 - 2004 Keizersveer 0,25. 0,25. Isoproturon (ug/l). 0,25. Isoproturon (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2003 RIWA-M. 2002 2004 BKMO/DWD. 2003 RIWA-M. november 2006.

(88) median isopr (µg/l). mean isopr (µg/l). min isopr (µg/l). max isopr (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.020 0.010 0.010. 0.041 0.016 0.023. 0.010 0.010 0.010. 0.100 0.030 0.060. Keizersveer. 2002 2003 2004. 0.046 0.008 0.020. 0.055 0.013 0.045. 0.008 0.008 0.008. 0.120 0.040 0.110. n> 0.05 µg/l RIWA-M. n> 0.1 µg/l BKMO/DWD. n> 0.32 µg/l MKE. n> 1.0 µg/l WFD(06). 7 7 7. 2 0 1. 0 0 0. 0 0 0. 0 0 0. 10 7 7. 3 0 3. 2 0 1. 0 0 0. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden 0,25. Isoproturon (ug/l). 0,2 0,15 0,1 0,05 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 80 -. november 2006.

(89) A5b.5 Glyfosaat. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 0,5. 2500. 0,4. 0,4. 0,4. 0. © Kiwa Water Research. discharge Keizersveer glyfosaat Keizersveer. 0,2 0,1. 2002 2004 BKMO/DWD. - 81 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. 28-okt. Date. Date. Date discharge Eijsden glyfosaat Eijsden. 0,3. 0. 29-aug. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,1. 30-jun. 0,1. 500. 0,2. 1-mei. 0,2. 1000. 0,3. 2-mrt. 0,3. 1500. 1-jan. 2000. Glyfosaat (ug/l). 0,5. Glyfosaat (ug/l). 0,5. Glyfosaat (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2003 RIWA-M. 2002 2004 BKMO/DWD. 2003 RIWA-M. november 2006.

(90) median glyf (µg/l). mean glyf (µg/l). min glyf (µg/l). max glyf (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.12 0.20 0.22. 0.15 0.20 0.21. 0.05 0.11 0.12. 0.32 0.31 0.28. Keizersveer. 2002 2003 2004. 0.17 0.20 0.26. 0.16 0.19 0.24. 0.06 0.07 0.10. 0.25 0.28 0.36. n> 0.05 µg/l RIWA-M. n> 0.1 µg/l BKMO/DWD. n> 77 µg/l MTR. 7 7 7. 6 7 7. 4 7 7. 0 0 0. 7 7 12. 7 7 12. 5 6 11. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden 0,5 y = 0,6126x -0,3203 R2 = 0,3162. Glyfosaat (ug/l). 0,4 0,3 0,2 0,1 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 82 -. november 2006.

(91) A5b.6 AMPA. © Kiwa Water Research. discharge Keizersveer AMPA Keizersveer. - 83 -. 27-dec. 28-okt. 29-aug. Date. Date 2002 2004 BKMO/DWD. 30-jun. 0. 1-mei. 0. 2-mrt. AMPA (ug/l). 0,4. Date discharge Eijsden AMPA Eijsden. 0,8. 1-jan. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 1,2. 0,4. 27-dec. 500. 0,8. 28-okt. 0,4. 1,2. 29-aug. 0,8. 1000. 1,6. 30-jun. 1,2. 1500. 1,6. 1-mei. 2000. 2. 2-mrt. 1,6. 2002 - 2004 Keizersveer. 2. 1-jan. 2500. AMPA (ug/l). 2002 - 2004 Eijsden 2. AMPA (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2003 RIWA-M. 2002 2004 BKMO/DWD. 2003 RIWA-M. november 2006.

(92) median AMPA (µg/l). mean AMPA (µg/l). min AMPA (µg/l). max AMPA (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.69 1.40 0.78. 0.64 1.26 0.96. 0.14 0.63 0.50. 0.99 1.80 1.50. Keizersveer. 2002 2003 2004. 1.30 1.60 1.55. 1.24 1.54 1.51. 0.37 0.86 0.99. 1.80 1.90 1.90. n> 0.05 µg/l RIWA-M. n> 0.1 µg/l BKMO/DWD. 7 7 7. 7 7 7. 7 7 7. 7 7 12. 7 7 12. 7 7 12. n 0 0 0. 2002 - 2004 Eijsden 3 y = 11,581x -0,679 R2 = 0,7457. AMPA (ug/l). 2,5 2 1,5 1 0,5 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 84 -. november 2006.

(93) Addendum A5c: Other organic micro pollutants during droughts A5c.1 MTBE. 2002 - 2004 Eijsden. 0. Date. Date discharge Eijsden. © Kiwa Water Research. MTBE Eijsden. 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,5. 28-okt. 0,5. 500. 1. 29-aug. 1. 1000. 1,5. 30-jun. 1,5. 1500. 1-mei. 2000. 2. 2-mrt. 2. 1-jan. 2500. 2,5. MTBE (ug/l). 2,5. MTBE (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2002 2004. - 85 -. 2003 DWD. november 2006.

(94) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median MTBE (µg/l). mean MTBE (µg/l). min MTBE (µg/l). max MTBE (µg/l). n. n> 1 µg/l DWD. n> 2600 µg/l MTR. 0 1 0. 0 0 0. 0 0 0 0.30 0.40 0.10. 0.36 0.61 0.26. 0.10 0.10 0.10. 0.80 1.70 1.00. 7 7 7 0 0 0. 2002 - 2004 Eijsden 2 y = 1,561x -0,4652 R2 = 0,4105. MTBE (ug/l). 1,5. 1. 0,5. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 86 -. november 2006.

(95) A5c.2 Benzene. 2002 - 2004 Eijsden. 2002 - 2004 Keizersveer 0,1. 2500. 0,08. 0,08. 0,08. 0. © Kiwa Water Research. discharge Keizersveer benzene Keizersveer. 0,04 0,02. 2002 2004. - 87 -. 27-dec. 28-okt. 29-aug. 30-jun. 1-mei. 2-mrt. 1-jan. 27-dec. Date. Date. Date discharge Eijsden benzene Eijsden. 0,06. 0. 28-okt. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,02. 29-aug. 500. 30-jun. 0,02. 0,04. 1-mei. 0,04. 1000. 0,06. 2-mrt. 0,06. 1500. 1-jan. 2000. Benzene (ug/l). 0,1. Benzene (ug/l). 0,1. Benzene (ug/l). Discharge (m3/s). 2002 - 2004 3000. 2003 RIWA-M. 2002 2004. 2003 RIWA-M. november 2006.

(96) median benz (µg/l). mean benz (µg/l). min benz (µg/l). max benz (µg/l). location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. 0.01 0.01 0.01. 0.01 0.01 0.01. 0.01 0.01 0.01. 0.01 0.02 0.01. Keizersveer. 2002 2003 2004. 0.03 0.03 0.01. 0.03 0.03 0.01. 0.03 0.03 0.01. 0.03 0.03 0.01. n> 0.1 µg/l RIWA-M. n> 1 µg/l DWD. n> 50 µg/l WFD(06). n> 240 µg/l MKE. 7 7 7. 0 0 0. 0 0 0. 0 0 0. 0 0 0. 12 11 7. 0 0 0. 0 0 0. 0 0 0. 0 0 0. n 0 0 0. 2002 - 2004 Eijsden 0,1. Benzene (ug/l). 0,08 0,06 0,04 0,02 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 88 -. november 2006.

(97) A5c.3 1.2-Dichloroethane. Date discharge Eijsden. © Kiwa Water Research. 1,2-dichloorethene Eijsden. 0. 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,2. 28-okt. 0,2. 500. 0,4. 29-aug. 0,4. 1000. 0,6. 30-jun. 0,6. 1500. 1-mei. 2000. 0,8. 2-mrt. 0,8. 1. 1-jan. 2500. 1,2-dichloroethane (ug/l). 2002 - 2004 Eijsden 1. 1,2-dichloroethane (ug/l). Discharge (m3/s). 2002 - 2004 3000. Date 2002 2004. - 89 -. 2003 RIWA-M. november 2006.

(98) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median 1,2-diCleth (µg/l). mean 1,2-diCleth (µg/l). min 1,2-diCleth (µg/l). max 1,2-diCleth (µg/l). n. n> 1 µg/l RIWA-M. n> 3 µg/l DWD. 1 0 1. 0 0 0. 0 0 0 0.29 0.21 0.54. 0.43 0.21 0.55. 0.20 0.12 0.07. 1.10 0.32 1.40. 7 7 7 0 0 0. 2002 - 2004 Eijsden 1,2-dichloroethane (ug/l). 1 0,8 0,6 0,4 0,2 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 90 -. november 2006.

(99) A5c.4 Chloroform. 2002 - 2004. 2002 - 2004 Eijsden 0,4. 0. Date. Date discharge Eijsden. © Kiwa Water Research. chloroform Eijsden. 27-dec. 27-09-04. 19-06-04. 11-03-04. 2-12-03. 24-08-03. 16-05-03. 5-02-03. 28-10-02. 20-07-02. 11-04-02. 0. 1-01-02. 0. 0,1. 28-okt. 0,1. 500. 29-aug. 1000. 0,2. 30-jun. 0,2. 1-mei. 1500. 0,3. 2-mrt. 0,3. 2000. 1-jan. 2500. Chloroform (ug/l). 0,4. Chloroform (ug/l). Discharge (m3/s). 3000. 2002. - 91 -. 2003. 2004. november 2006.

(100) location. period (Jun-Nov). Eijsden. 1975 1976 1977. Eijsden. 2002 2003 2004. Keizersveer. 2002 2003 2004. median Cl-form (µg/l). mean Cl-form (µg/l). min Cl-form (µg/l). max Cl-form (µg/l). n. n> 1 µg/l RIWA-M. n> 25 µg/l DWD. n> 590 µg/l MKE. 0 0 0. 1 0 0. 0 0 0. 0 0 0 0.10 0.10 0.13. 0.14 0.11 0.14. 0.07 0.07 0.06. 0.30 0.19 0.25. 7 7 7 0 0 0. 2002 - 2004 Eijsden. Chloroform (ug/l). 0,4. 0,3. 0,2. 0,1. 0 0. 500. 1000. 1500. 2000. Discharge (m3/s). © Kiwa Water Research. - 92 -. november 2006.

(101) Addendum B1: General water quality parameters during floods B1.1 Water temperature. 4 2. 0. 0. w aterT Eijsden. discharge Eijsden. - 93 -. 4-03-03. 500. Date w aterT Eijsden. discharge Eijsden. w aterT Eijsden. november 2006. Water temperature (C). 6. 1000. Date. Date. © Kiwa Water Research. 8. 1500. 12-02-03. 0. 10. 2000. 23-01-03. 0. 12. 3-01-03. 2. 2500. 14-12-02. 500. 14. 24-11-02. 19-02-94. 30-01-94. 10-01-94. 21-12-93. 01-12-93. 11-11-93. 0 22-10-93. 0. 4. 3000. 4-11-02. 2. 6. 1000. Discharge (m3/s). 500. 1500. Water temperature (C). 4. 8. 30-03-95. 1000. 2000. 10-03-95. 6. 10. 18-02-95. 1500. 12. 29-01-95. 8. 2500. 9-01-95. 2000. 14. 20-12-94. 10. 3000. 30-11-94. 12. 2500. Discharge (m3/s). 3000. discharge Eijsden. Flood 2003. Flood 1995 14. Water temperature (C). Discharge (m3/s). Flood 1993 3500.

(102) mean waterT (C). min waterT (C). max waterT (C). n. n> 25 °C standards. location. flood. period. median waterT (C). Eijsden. reference flood 1993 reference. 22-10-1993/6-12-1993 7-12-1993/20-1-1994 21-1-1994/22-2-1994. 10.7 6.9 6.9. 9.1 6.8 6.8. 5.1 5.2 5.2. 11.9 8.1 7.9. 46 45 33. 0 0 0. Eijsden. reference flood 1995 reference. 30-11-1994/20-1-1995 21-1-1995/11-2-1995 12-2-1995/31-3-1995. 8.5 7.4 8.5. 8.5 7.5 8.4. 4.0 6.7 7.0. 13.2 8.8 9.7. 52 22 48. 0 0 0. Eijsden. reference flood 2003 reference. 4-11-2002/19-12-2002 20-12-2002/14-1-2003 15-1-2002/4-3-2003. 9.7 7.0 5.2. 9.1 6.1 5.6. 6.0 1.4 3.5. 11.9 9.5 8.2. 46 26 49. 0 0 0. © Kiwa Water Research. - 94 -. november 2006.

(103) B1.2 Oxygen Flood 1995. Date discharge Eijsden standards. © Kiwa Water Research. 0. Date. Date oxygen Eijsden. discharge Eijsden standards. - 95 -. 4-03-03. 30-03-95. 10-03-95. 18-02-95. 29-01-95. 9-01-95. 20-12-94. 30-11-94. 0. oxygen Eijsden. discharge Eijsden standards. oxygen Eijsden. november 2006. Oxygen (mg/l). 500 12-02-03. 500. 23-01-03. 0. 1000. 3-01-03. 2. 0. 1500. 14-12-02. 500. 1000. 2000. 24-11-02. 4. 1500. 2500. 4-11-02. 1000. 2000. 16 14 12 10 8 6 4 2 0. 3000. Discharge (m3/s). 6. Flood 2003 16 14 12 10 8 6 4 2 0. Oxygen (mg/l). 1500. Discharge (m3/s). 8. Oxygen (mg/l). 2000. 19-02-94. 10. 30-01-94. 2500. 2500. 10-01-94. 12. 21-12-93. 3000. 01-12-93. 3000. 11-11-93. 14. 22-10-93. Discharge (m3/s). Flood 1993 3500.

(104) location. flood. period. median O2 (mg/l). Eijsden. reference flood 1993 reference. 22-10-1993/6-12-1993 7-12-1993/20-1-1994 21-1-1994/22-2-1994. 9.5 11.4 12.1. 9.5 11.5 12.2. 7.9 10.6 11.9. 10.9 12.1 12.6. 4 5 5. 0 0 0. Eijsden. reference flood 1995 reference. 30-11-1994/20-1-1995 21-1-1995/11-2-1995 12-2-1995/31-3-1995. 10.9 12.0 12.3. 11.3 12.0 12.5. 8.3 12.0 11.9. 13.6 12.0 13.2. 7 1 7. 0 0 0. Eijsden. reference flood 2003 reference. 4-11-2002/19-12-2002 20-12-2002/14-1-2003 15-1-2002/4-3-2003. 10.7 12.9 12.4. 10.9 13.0 12.5. 10.2 11.8 12.2. 11.8 14.4 13.3. 7 4 7. 0 0 0. © Kiwa Water Research. mean O2 (mg/l). min O2 (mg/l). max O2 (mg/l). n. n< 5 mg/l standards. - 96 -. november 2006.

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