Eutrophication control strategies for three shallow Vecht lakes in the province of North Holland

Verstraelen, P.J.T.; Wisserhof, J.; Rodić, Lj.; Eijsink, R.

doi:10.1007/978-94-011-2432-4_22

Cited by 2 publications

(4 citation statements)

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“…In this respect a cost-benefit analysis is necessary. This analysis requires data on the hydrology (Verstraelen et al, 1992), the likely ecological impact of the suggested options (this paper) and the estimate costs (Verstraelen et al, 1992). The available amount of the different types of supply water was taken into account.…”

Section: Cost-benefit Analysismentioning

confidence: 99%

“…Dephosphorized water from the Vecht River south of the treatment plant (option c) is preferable to the other supply options with dephosphorization (a & b), for the costs are almost equal and the ecological improvement is higher. However, with Verstraelen et al (1992). Ecological benefit expressed in percentage of maximum option (see text).…”

Section: Cost-benefit Analysismentioning

confidence: 99%

“…This low level also causes drainage of water from the adjacent polders, which results in water shortages in these polders in summer. At present there is an annual deficit of 20 x lo6 m3 in the polder Kortenhoef and of 3 x lo6 m3 in the polder Stichts Ankeveen (Verstraelen et al, 1992). A secondary effect is the discharge of brackish water from the deeper aquifer to the surface in the centre of the Polder Horstermeer (Witmer, 1989;Schot, 1991).…”

Section: Introductionmentioning

confidence: 99%

“…Since 1930, the amounts of nutrients and major ions in the Vecht River have increased due to pollution of the Rhine River and the discharge of wastewater from the city of Utrecht . At present the main source of eutrophication in the Kortenhoef Polder is the water from the Vecht River, which may supply up to 20 tons phosphorus a year (Verstraelen et al, 1992). The supply of nutrient-rich surface water to the lakes over many years has increased the nutrient content of the sediments .…”

Section: Introductionmentioning

confidence: 99%

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Restoration of fen ecosystems in the Vecht River plain: cost-benefit analysis of hydrological alternatives

1992

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In the Vecht river plain, the vegetation diversity has been diminished during recent decades, due to hydrological changes and resulting eutrophication. Different options are discussed for hydrological management aimed at abating the eutrophication and at stimulating the characteristic mesotraphent succession phases of the fen vegetation. The ecological impact of the management plans are estimated with the hydro-ecological model ICHORS; this model takes into account the relations between the non-biotic environment and the presence of hydrophytes and phreatophytes. The impact of the hydrological options is assessed, after rearrangement of the predicted values of the species to values of the required fen vegetation. These results are incorporated in the management options with the water balances of the polders. Information on the costs of the options is used as a basis for a cost-benefit analysis. Technical hydrological solutions such as purification of the supplied water might contribute to the eutrophication abatement, but they are on their own unlikely to restore the ecosystems. Contrastingly, options involving the restoration of the original hydrology would probably lead to the characteristic mesotraphent fen vegetation once more, and the financial implications of this are likely to be the more favourable in the long-term.

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Section: Cost-benefit Analysismentioning

confidence: 99%

Section: Cost-benefit Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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