Centre for Water Management Budapest, 12 October 2007.

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Presentation transcript:

Centre for Water Management Budapest, 12 October 2007

Characteristics of lakes Ecosystem approach in restoration What are the results sofar? Prospects for 2015?

River IJssel 1932 Afsluitdijk IJsselmeer Markermeer

P-inflow P-lake algae turbidity nutrient management hydro- morphology fisheries management

Total Phosphorus Rhine at D/NL border

Means apr-sep

100 m m-2 Dreissena mg.m-3 secchi in mm Fisheries

Bream kg.ha-1 mussel N.m-2 Fisheries

fishery bream disturbance sediment turbidity Chara beds Dreissena mussels After Lammens et al. (2004)

Conditions today: positive trends in P, N, CHL and Secchi some clear water, macrophyte-dominated lakes still many turbid water lakes, no macrophytes Short-term action: Sewage: 4-th step in treatment plants in some catchments Agriculture: reduce surface run off by smart agr practices Fishery: reduce bream to help macrophytes & mussels

Clear water lakes 2015? Yes, … if bream fishery is accepted as management tool Long-term perspectives? Natural water levels Flooding of adjacent land areas (following sea level rise) Letting the sea back in?

Mission: learning, inspiration, helping,.. Integrating water policy, lake science and lake management,.. Organization: members on list - national/local government, consultancy, universities, stake holders - informal platform, no membership dues, free meetings/lunches (rotating hosts pay for that) - programme committee (<0.5 ftu), administration by CWM (Centre for Water Management, = ex RIZA)

Activities: - meetings 2x per year, field excursions - international excursions (Broads UK, Müritzsee D, Jutland DK?) - sounding board for case studies/restoration plans - national eutrophication survey - website ( under restoration )

- EU network of national networks Social network & virtual network Sowing the seeds for: European Lake Management Society (ELMS)? First EU Lake Management Conference 2010? See also: