Hydro-ecological relations in the Delta Waters
Hydro-ecological relations in the Delta Waters Hydro-ecological relations in the Delta Waters
Furthermore, it is questionable whether such flushing would be effective, given the shape awd size of the lake system. Table 4 Phosphate load in Lake BrieUe and the Volkerak-low lake sye tem Lake Brielle 1972-1976 1980-1982 1983 1987-1988 Volkerak-Zoom Lake system preaicted 1987 1988 guide value P-linitation Table 5 Phosphate load in the Volkerak-Zoom lake system in 1987 and 1988 m3/s ton P ms/s ton P Volkerak sluices 28 250 16 140 Brabant rivers 15 460 12 240 Other 5 60 5 60 Total 48 770 33 440
Table 5 gives estimtes of the phosphate load originating from the most important sources in 1987 and 1988. The difference between the two years for the Volkerak sluices is caused by the extra amount of water needed to desalipFEe the lake in 1987. MW& less phosphate was brought in by the Brabat rivers in 1988 because in May 1988 the effluent from the sewage Ereatwent plant at Bred& Nieuweer, was diverted from the Dintel to the Holland6 Diep. When, in the future, water is extracted from tbe lake for agriculture, the phasphate load will be higher hficause more water viz1 have to be sdmirted via the Volkerak sluiees. The phosphate load in the Volkerak-Zoom lake system could be reduced by: - diverting water from the Nieuwveer sewage treatment plant from the Dintel to the nollands Diep (this wes done in Bay 1988); - the Rhine Action Plan (RAP); - the North Sea Action Plan (NAP); - optiolizing the intake from: t water losees from locks; * agriculture; - treating intake water; - rsducing agricultural emission*; - reaching agreement with Belgium on the reduction of the load in the Belgian part of the Dintel catchment; - drastic dephosphatiuation sewage treatment plants. It is expected that the implementation of the Rhine Action Plan and the North Sea Action Pla will result in a halving of the phosphate load in the Volkerak-Zoom lake system too. However, this will nor happen before 1993. If the almve-mentioned measures are implemented vigorously. it seems possible that phosphate limitation for algal growth could be achieved in the medium term; in the short term thb is not expected.
- Page 1 and 2: Netherlands organkation fw applied
- Page 4 and 5: TNO Commlitee on Hydrological Resea
- Page 6 and 7: 2 RIVER WATER AM) THE QPALITH OF TB
- Page 8: B.J.M. Baptist BIJkswaterstaat. Tid
- Page 11 and 12: This approach will put to use what
- Page 13 and 14: Estuaries that have not been influe
- Page 15 and 16: 2 CHIWGES XN TEE DELTA The Delta ar
- Page 17 and 18: area decltned cnnside~ably, leadins
- Page 19 and 20: Plan, then it is apparent tbt the s
- Page 21 and 22: Tiddl flats df the Eastem Seheldt v
- Page 23 and 24: tracefore possible to convert the a
- Page 25 and 26: Figsrlre 7 Changes in the cadrnrum
- Page 27 and 28: prevention measures are desirable h
- Page 29 and 30: elationships between different spec
- Page 31 and 32: Bio-essay Weriments with polluted s
- Page 33 and 34: considerable thought to drawing up
- Page 35 and 36: ShLOUONS, W. and BYSINK, W.D., 1981
- Page 37 and 38: are taken. The first year after the
- Page 39 and 40: The Hollands DiepJnaringpllet is pa
- Page 41 and 42: In 1976 the determination of chlozo
- Page 43 and 44: , 0.66 m 0,s - 0.02 1989 I 0.86 - 0
- Page 45 and 46: Table 3 Eutrophication of the Volke
- Page 47 and 48: Laks Volkarek ---- Lake Zoom 0.40 0
- Page 49: 4 WAGBEET MEdSIIRaS TO PEEVBT OR LT
- Page 53 and 54: In principle, two states of equilib
- Page 55 and 56: Zooplankton (Alma affinis) Pike (Es
- Page 58 and 59: EUTROPHICATION OF ESTUAAIES AND BRA
- Page 60 and 61: The average discharge of Xhine and
- Page 62 and 63: and only l-2% cows frm the aive Sch
- Page 64 and 65: highest trophic potential: nutrient
- Page 66 and 67: period 1980-19$3 in an increase of
- Page 68 and 69: model calculations reveal that a ni
- Page 70 and 71: Table 3 PreUmInary carbon budget of
- Page 72 and 73: Water life of Lake Grevelingen
- Page 74 and 75: macrophytes livkg on or rooting in
- Page 76 and 77: less predictable for water managers
- Page 78 and 79: ILWNEWIJK, A.. KEIP, C., 1988. De v
- Page 80 and 81: XBE CHANGING TmAL LAMXiCAPE I N TEE
- Page 82 and 83: The storm surke of L&Z1 A.D., knorm
- Page 84 and 85: osi* rn@8IOIP m .SL 4 Has F~~ULB 3
- Page 86 and 87: During the 19th century man starts
- Page 88 and 89: mudflats have retreated some 100-20
- Page 90 and 91: aq811~33a.e~ pue 3pTatlJS uxaJsafi
- Page 92 and 93: Erosion by waves of sandy shoals (c
- Page 94 and 95: Lt has been estimated that the sedi
- Page 96 and 97: Implementafion of the Delta Project
- Page 98 and 99: ECOLOGICAL DEVELOWdENT OF SALT MAKS
Fur<strong>the</strong>rmore, it is questionable whe<strong>the</strong>r such flush<strong>in</strong>g would be<br />
effective, given <strong>the</strong> shape awd size of <strong>the</strong> lake system.<br />
Table 4 Phosphate load <strong>in</strong> Lake BrieUe and <strong>the</strong> Volkerak-low lake<br />
sye tem<br />
Lake Brielle<br />
1972-1976<br />
1980-1982<br />
1983<br />
1987-1988<br />
Volkerak-Zoom<br />
Lake system<br />
preaicted<br />
1987<br />
1988<br />
guide value<br />
P-l<strong>in</strong>itation<br />
Table 5<br />
Phosphate load <strong>in</strong> <strong>the</strong> Volkerak-Zoom lake system <strong>in</strong> 1987 and<br />
1988<br />
m3/s ton P ms/s ton P<br />
Volkerak sluices 28 250 16 140<br />
Brabant rivers 15 460 12 240<br />
O<strong>the</strong>r 5 60 5 60<br />
Total 48 770 33 440
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