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Have a water crisis? Time to call the Dutch

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M . V A N L E D D E N P H D M B A / A . V E R W E Y / T . N A U TA D e T h ai se h o o fd st ad B an g ko k lig t aa n d e r iv ie r C h ao P h ra ya , d ie u it st ro o m t in d e G o lf v an T h ai -la n d . D e le n g te v an h e t to ta le s tr o o m g e b ie d v an d e C h ao P h ra ya is c ir ca 7 0 0 k ilo m e te r e n d e o p -p e rv la kt e o n g e ve e r 1 6 0 .0 0 0 k m 2. D e r iv ie r is r e la -ti e f k o rt , m e t e e n g ro o t ve rv al e n e e n r e la ti e f g ro o t st ro o m g e b ie d (d e M aa s is ie ts la n g e r m e t 9 4 0 k ilo m e te r, m aa r m e t e e n s tr o o m g e b ie d v an 3 5 .0 0 0 k m 2). Th ai la n d h e e ft e e n t ro p is ch k lim aa t, m e t e e n re g e n p e ri o d e (m o e ss o n ) v an m e i t o t o kt o b e r e n e e n d ro g e p e ri o d e v an n o ve m b e r to t ap ri l. D e g e m id d e ld e ja ar lij ks e n e e rs la g is o n g e ve e r 1 .2 0 0 m ill im e te r, w aa rv an o n g e ve e r 9 0 p ro ce n t in d e m o e ss o n p e ri o d e v al t. In h e t b o ve n st ro o m se d e e l va n h e t st ro o m g e b ie d v o e d e n v ie r zi jr iv ie re n (P in g , W an g , Y o m a n d N an ) d e C h ao P h ra ya . B e -n e d e n st ro o m s w o rd t d it w at e r ve rd e e ld o ve r ku n st m at ig e e n n at u u rl ijk e w at e rl o p e n v o o r ir ri -g at ie e n d ra in ag e. D e h o o fd as v an d e C h ao P h ra ya s tr o o m t d o o r B an g ko k e n m o n d t n e t te n zu id e n v an d e ze s ta d u it in d e Go lf v an T h ai la n d . In h e t st ro o m g e b ie d z ijn in h e t ve rl e d e n a lle r-le i c o n st ru ct ie s g e b o u w d , b ijv o o rb e e ld m e e r d an d ri e d u iz e n d d am m e n b o ve n st ro o m s o m h e t w at e r o p t e v an g e n t ijd e n s d e m o e ss o n p e ri o d e e n v o o r h e t o p w e kk e n v an e le kt ri ci te it . D aa r-n aa st z ijn e r ta l v an o ve rl at e n o m h e t w at e r in IN 'T K O R T O V E R S T R O M IN G O ve rs tr o m in g v a n T h a is e r iv ie r C h a o P h ra ya e n d ij kd o o rb ra ke n in o k to b e r 2 0 1 1 C ri si st e a m m a a k t o ve rs tr o m in g sv e rl o o p in st ro o m g e b ie d e n B a n g ko k in zi cht e li jk A d e q u a at b e sc h e rm in g sn iv e a u is c ru ci a a l, e ve n a ls c o m m u n ic at ie e n v o o rs p e ls ys te m e n Le s vo o r N e d e rl a n d : r e a li te it sg e h a lt e v a n cr is is o e fe n in g e n v e rg ro te n O v erstr oomde industriez one t en noor den v an Bangk ok . FO TO : R OY AL H AS KO NIN G h e t st ro o m g e b ie d t e v e rd e le n v o o r ir ri g at ie d o e l-e in d e n e n b e sc h e rm in g t e g e n o ve rs tr o m e n . M o e ss o n se iz o e n 2 0 1 1 In 2 0 1 1 w as e r ze e r la n g d u ri g e e n h e vi g e r e g e n -va l i n h e t st ro o m g e b ie d v an d e C h ao P h ra ya . A l aa n h e t b e g in v an h e t ja ar , i n h e t d ro g e s e iz o e n , vi e l e xt re e m v e e l n e e rs la g . I n m aa rt 2 0 1 1 v ie l i n h e t n o o rd e n v an T h ai la n d o n g e ve e r ti e n k e e r zo -ve e l n e e rs la g a ls g e m id d e ld . A an h e t b e g in v an h e t m o e ss o n se iz o e n in m e i w as e r sp ra ke v an e e n t ro p is ch e s to rm m e t ve e l n e e rs la g . I n a u g u s-tu s e n s e p te m b e r w e rd d e r e g e n va l v e rs te rk t d o o r h e t e ff e ct v an L a N iñ a. O ve r d e p e ri o d e ja -n u ar i t o t e n m e t se p te m b e r 2 0 1 1 v ie l 4 0 p ro ce n t m e e r n e e rs la g d an g e m id d e ld . B e g in s e p te m b e r w ar e n d e g ro te r e se rv o ir s b o ve n st ro o m s in h e t C h ao P h ra ya -s tr o o m g e b ie d g e vu ld t o t o f z e lf s o ve r h u n m ax im al e c ap ac it e it . H ie rd o o r m o e st d e a fv o e r va n d e ze r e se rv o ir s w o rd e n o p g e vo e rd o m d am b re u ke n t e v e rm ij-d e n . I n c o m b in at ie m e t aa n h o u d e n d e r e g e n va l st e g e n d e w at e rs ta n d e n t o t re co rd h o o g te n e n ko n h e t ri vi e re n sy st e e m d e h o e ve e lh e id w at e r n ie t m e e r ve rw e rk e n . T u ss e n h al f e n e in d s e p -te m b e r w ar e n e r te n m in st e t ie n g ro te d ijk d o o r-b ra ke n in h e t b o ve n st ro o m se d e e l v an h e t st ro o m g e b ie d . D e g ro te h o e ve e lh e id w at e r in h e t n o o rd e n zo ch t in o kt o b e r 2 0 1 1 la n g za am e e n w e g r ic h -ti n g d e G o lf v an T h ai la n d . D e c ap ac it e it v an d e C h ao P h ra ya w as b ij la n g e n a n ie t to e re ik e n d . O p ve e l p la at se n s tr o o m d e d e r iv ie r o ve r e n v o n d e n n ie u w e d ijk d o o rb ra ke n p la at s. H al f o kt o b e r 2 0 1 1 tr ad e e n p ie ka fv o e r o p v an c ir ca 4 .7 0 0 m 3/s (o n -g e ve e r 3 0 p ro ce n t h o g e r d an d e b e n e d e n -st ro o m se c ap ac it e it v an d e r iv ie r) . O o k d e r in g -d ijk r o n d o m B an g ko k w as n ie t in s ta at h e t w at e r te k e re n . H e t n o o rd e lij ke d e e l v an B an g ko k w as o ve rs tr o o m d e n h e e ft d e e ls b ijn a tw e e m aa n d e n o n d e r w at e r g e st aa n . I n h e t zu id e lij ke d e e l v an B an g ko k w as d e d ra in ag e e n p o m p ca p ac it e it vo ld o e n d e o m d aa r d ro g e v o e te n t e h o u d e n . O o k h e e ft e e n n o o d d ijk n aa r al le w aa rs ch ijn lij k-h e id e e n p o si ti e ve b ijd ra g e g e le ve rd . D e s o ci al e e n e co n o m is ch e c o n se q u e n ti e s va n d e ze o ve rs tr o m in g z ijn e n o rm . C ir ca 1 4 m il-jo e n m e n se n z ijn g e tr o ff e n e n e r vi e le n m e e r d an 8 0 0 s la ch to ff e rs d o o r ve rd ri n ki n g e n e le kt ro -cu ti e. D e s ch ad e w o rd t g e sc h at o p 4 5 m ilj ar d d o lla r. D e m e e st e s ch ad e is o n ts ta an in d e in d u s-tr ie zo n e s te n n o o rd e n v an B an g ko k. H ie r zi jn g ro te in te rn at io n al e o n d e rn e m in g e n g e ve st ig d , zo al s H o n d a e n C an o n . D e ze z o n e s w e rd e n b e -sc h e rm d d o o r ri n g d ijk e n , d ie o p d iv e rs e p la at se n zi jn d o o rg e b ro ke n o f o ve rs tr o o m d m e t al s re su l-ta at 2 t o t 3 m e te r w at e r in d e ze in d u st ri e zo n e s. C ri si sm a n a g e m e n t Ti jd e n s h e t h o o g te p u n t va n d e o ve rs tr o m in g in e n r o n d B an g ko k h e e ft d e T h ai se o ve rh e id e e n ve rz o e k in g e d ie n d v o o r N e d e rl an d se a ss is te n ti e. H ie rv o o r is d e h u lp in g e ro e p e n v an D e lt ar e s e n la te r R o ya l H as ko n in g . S am e n m e t tw e e T h ai se m e d e w e rk e rs v an d e K as e ts ar t U n iv e rs it e it in B an g ko k vo rm d e d e ze g ro e p e e n a d -h o ct e am , d at w e rk te b ij h e t Fl o o d R e lie f’s O p e ra ti o n C e n -tr e. In d it c e n tr u m w ar e n d iv e rs e m in is te ri e s e n 2 5 L A N D + W A T E R N R . 4  A P R IL 2012 Nakhon S aw an Nakhon S aw an Sing Buri Ayuttha ya Bangk ok Sing Buri Ayuttha ya Bangk ok 0 25 50 100 150 200 [k m]

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10 k m 10 k m O VERSTR OMING O v erstr omingsbeeld v an het c en trum v an Bangk ok op 18 no v ember 2011, gesimuleer d met het pr ogr amma S obek 1D2D .

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aals v an het leger , de minist er v an Justitie P racha P romnok en pr emier Y ingluck S hina w a tr a v an T hailand . FO TO : D ELT AR ES h e t le g e r b ij e lk aa r o m d e c ri si sb e h e e rs in g a an t e st u re n . Ee n b e la n g ri jk e b ijd ra g e v an h e t te am is g e -w e e st h e t in zi ch te lij k m ak e n v an h e t o ve rs tr o -m in g sv e rl o o p in h e t st ro o m g e b ie d e n la te r m e e r in d e ta il vo o r d e s it u at ie in B an g ko k. H ie rv o o r is e e n S o b e k 1 D 2 D -m o d e l o p g e ze t o m h e t o ve r-st ro m in g sv e rl o o p t e s im u le re n . V an w e g e g e b re k aa n g e g e ve n s h e e ft h e t te am v e e l i n fo rm at ie z e lf ve rz am e ld d o o r h e t ve ld in t e g aa n e n s ch at ti n -g e n t e m ak e n v an d ijk h o o g te n e n w at e rd ie p te n . B ri e fi n g s w e rd e n g e o rg an is e e rd m e t h o o g g e -p la at st e o ff ic ia ls v an m in is te ri e s e n h e t le g e r o m h e n t e in fo rm e re n o ve r h e t ve rl o o p v an d e o ve r-st ro m in g e n m o g e lij ke m aa tr e g e le n , z o al s h e t p la at se n v an z an d za kk e n e n in sp e ct e re n v an sp e ci fi e ke d ijk e n e n p o m p st at io n s. Ti jd e n s e e n v an d e v e ld b e zo e ke n b le e k d at e r e e n o p e n in g w as in h e t n o o rd e lij ke d e e l v an d e ri n g d ijk v an B an g ko k. H e t te am h e e ft a an d e a u -to ri te it e n d e s u g g e st ie g e d aa n o m s n e l e e n n o o d d ijk a an t e le g g e n r o n d o m d e ze o p e n in g o m d e in st ro o m v an w at e r te s to p p e n . M e t g ro te za n d za kk e n is in e e n w e e k ti jd e e n n o o d d ijk a an -g e le g d v an c ir ca 1 0 k ilo m e te r. H ie rd o o r is n aa r al le w aa rs ch ijn lij kh e id d e w at e ro ve rl as t su b st an -ti e e l b e p e rk t in h e t zu id e lij ke d e e l v an d e s ta d . V e rd e r h e e ft h e t te am o p d ri e d o o r d e N e d e r-la n d se a m b as sa d e g e o rg an is e e rd e b ije e n ko m -st e n v o o rl ic h ti n g g e g e ve n a an b e la n g ri jk e, r o n d B an g ko k g e ve st ig d e N e d e rl an d se in d u st ri e ë n , zo al s U n ile ve r, M ak ro e n N X P. D e v o o rs p e lli n g e n h e b b e n t e ve n s e e n b e la n g ri jk e r o l g e sp e e ld b ij vo o rl ic h ti n g a an a n d e re a m b as sa d e s e n r e is - ad vi e ze n v o o r B an g ko k va n u it d e N e d e rl an d se o ve rh e id . D e b e st e il lu st ra ti e v an d e N e d e rl an d se ro l i s w aa rs ch ijn lij k d e k o p in d e B a n g ko k Po st va n 1 7 n o ve m b e r 2 0 1 1 : H a ve a w a te r c ri si s? T im e to c a ll th e D u tc h . L e ss e n Ee n b e la n g ri jk e le s va n d e ze o ve rs tr o m in g is d at e e n a d e q u aa t b e sc h e rm in g sn iv e au p as se n d b ij d e lo ka le d e m o g ra fi sc h e e n e co n o m is ch e s it u a-ti e c ru ci aa l i s o m r is ic o ’s t e r e d u ce re n . V o o r d e in -d u st ri e zo n e s ro n d B an g ko k zo u e e n fo rs e in ve s-te ri n g in e e n b e te re w at e rk e ri n g e co n o m is ch g e zi e n a b so lu u t re n d ab e l z ijn g e w e e st . O p lo s-si n g sr ic h ti n g e n b e tr e ff e n v e rd e r m e e r ca p ac it e it cr e ë re n in h e t ri vi e rs ys te e m , o p ti m al is at ie v an re se rv o ir b e h e e r m e t h o g e re p ri o ri te it v o o r b e n e -d e n st ro o m se v e ili g h e id , b e te r la n d g e b ru ik e n in st it u ti o n e le v e rb e te ri n g e n . D aa d w e rk e lij k e n st ru ct u re e l i n ve st e re n in g o e d o n d e rh o u d e n t ij-d ig e a an p as si n g e n in h e t w at e rk e ri n g sy st e e m b ij n ie u w e o n tw ik ke lin g e n is m in st e n s zo c ru ci -aa l. Ee n p ro g ra m m a al s R u im te v o o r d e R iv ie r o f d e id e e ë n o ve r m e e rl aa g se v e ili g h e id k u n n e n d aa rb ij e e n in sp ir at ie b ro n z ijn v o o r d e T h ai se s i-tu at ie . Ee n t w e e d e le s is d at g o e d e c o m m u n ic at ie e n in ze t va n s ta te -o f-th e -a rt v o o rs p e ls ys te m e n v o o r d e rg e lij ke s it u at ie s e ss e n ti e e l z ijn o m e ff e ct ie f m aa tr e g e le n t e n e m e n e n g e vo lg e n t e r e d u ce -re n . I n d e T h ai se s it u at ie w as d e c o m m u n ic at ie -st ru ct u u r n ie t h e ld e r, w aa rd o o r p ar ti je n la n g s e l-ka ar h e e n w e rk te n . O o k w as e r g ro te b e h o e ft e aa n in fo rm at ie , t e rw ijl d e ze la n g n ie t al ti jd b e -sc h ik b aa r w as . I n d e T h ai se m e d ia c ir cu le e rd e n ve e l h al ve e n h e le o n w aa rh e d e n o ve r d e o o rz a-ke n e n v e rw ac h te g e vo lg e n v an d e o ve rs tr o -m in g . H ie rd o o r b e st o n d b ij d e a u to ri te it e n v e e l o n ze ke rh e id o ve r d e v ra ag w e lk e m aa tr e g e le n e ff e ct ie f w ar e n e n w e lk e n ie t. D e m o d e lle ri n g d o o r h e t te am h e e ft v e e l h e ld e rh e id g e g e ve n aa n d e a u to ri te it e n o ve r w at e r n u w e rk e lij k aa n d e h an d w as e n w aa ro m b e p aa ld e m aa tr e g e le n w e l o f n ie t zi n vo l w ar e n . M a th ijs v a n L ed d en is w er kz a a m b ij R o ya l H a s-ko n in g , A d ri V er w ey e n T jit te N a u ta b ij D el ta re s. N ED ER LA N D D e s it u at ie in T h ai la n d il lu st re e rt d e n o o d -za ak in N e d e rl an d v o o r in ve st e ri n g e n in w a-te rv e ili g h e id . H e t D e lt ap ro g ra m m a e n o n -d e rz o e ks in it ia ti e ve n , z o al s h e t lo p e n d e p ro -g ra m m a Fl o o d C o n tr o l 2 0 1 5 w aa ri n d iv e rs e p ar ti je n in d e w at e rs e ct o r n ie u w e m e th o d e n e n t e ch n ie ke n o n tw ik ke le n v o o r d e c ri si sb e -h e e rs in g , z ijn d aa r g o e d e v o o rb e e ld e n v an . O e fe n e n v o o r d e rg e lij ke s it u at ie s is o o k va n b e la n g . H e t re al it e it sg e h al te v an d e ze o e fe -n in g e n is t e v e rg ro te n d o o r g e b ru ik t e m a-ke n v an N e d e rl an d se e rv ar in g e n t ijd e n s (d re ig e n d e ) o ve rs tr o m in g e n z o al s in T h ai -la n d e n e ld e rs t e r w e re ld (N e w O rl e an s e n J a-ka rt a) .

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