Restoration of the Vecht Lakes ecosystems surrouding the Horstermeer Polder: A feasibility study

Schouten, P.H.; Verstraelen, P.J.T.; Buntsma, Joost J.

doi:10.1016/0378-3774(88)90099-6

Cited by 5 publications

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“…For Lakes Kortenhoef and Ankeveen, management policies have been formulated with the aim of reducing eutrophication (Roijackers & Verstraelen, 1988;Schouten et al, 1988). One such measure relates to the waste water discharge plant in the Horstermeer, in operation since 1986.…”

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: Introductionmentioning

confidence: 99%

“…This plant brought to an end the discharge of untreated waste water in the area. Removal of the lake sediment has also been suggested (Schouten et al, 1988;Roijackers & Verstraelen, 1991). Ten options in water management are considered in this study (Table 1 and Fig.…”

Section: Introductionmentioning

confidence: 99%

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

1992

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“…Other measures are in preparation e.g., supplying the system with fresh seepage water from the polder Horstermeer, and decreasing the groundwater extractions in the Gooi by 50% (Provincial Board of NorthHolland, 1986;Schouten et al, 1988;Roijackers & Verstraelen, 1991).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 1992

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Like many shallow surface waters in the Netherlands the North Holland Vecht lakes, formerly known for their rich variety of flora and fauna, now face a serious eutrophication problem. Nutrient enrichment has been mainly in the form of (treated) wastewater discharges, and the continuing ingress of nutrientloaded water from the river Vecht. Yet, this water has to be supplied in order to compensate for water shortages resulting from (i) changes in the groundwater flow pattern due to reclamation of the deep polder Horstermeer, (ii) extensive groundwater extraction in the Gooi hills, and (iii) extensive drainage for agricultural purposes.The present policy of eutrophication abatement and restoration of the Ankeveen and Kortenhoef lakes ecosystems is focused on eliminating wastewater discharges and Vecht water supply. It also allows for additional dredging measures. Because of the un-suitable major ion composition of the Vecht, the aim is to compensate for this water supply by (i) partial restoration of the original groundwater flow from the Gooi hills and (ii) periphere additional supply with fresh seepage water from the skirts of the Horstermeer polder. However, uncertainty exists about the amounts of water needed.Water balances and phosphorus budgets have been established to ascertain the water demands of the lakes and to gain a detailed insight into the nutrient fluxes through the lakes. A groundwater flow model is used to assess the beneficial effects of the proposed measures.The results obtained, question the current unilateral restoration objectives. Calculations reveal that, both in the present situation and after (total) reduction of groundwater extractions in the future, the available quantity of fresh seepage water from the skirts of the polder Horstermeer is not sufficient to replace the inlet from the river Vecht into the Kortenhoef lakes. Additional supply options are available but the ones favoured from an ecological viewpoint are either the most expensive or less favoured from a social point of view. Although the sediments of the lakes appear to be a major source of eutrophication, the possibility of dredging the lakes will be considered only after reviewing results of a pilot-dredging project in the Hollands Ankeveen lakes in 1991. 236

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

Verstraelen

Wisserhof

Rodić

et al. 1992

Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in the Netherlands

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Restoration of the Vecht Lakes ecosystems surrouding the Horstermeer Polder: A feasibility study

Cited by 5 publications

References 0 publications

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

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

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

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

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