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Hagen Koch 1 , Stefan Kaden 2 , Michael Kaltofen 2

WBalMo Elbe / module Czechia - application fields and first results. Hagen Koch 1 , Stefan Kaden 2 , Michael Kaltofen 2 1 Brandenburg University of Technology Cottbus, Chair of Hydrology and Water Resources Management 2 WASY GmbH, Institute for Water Resources Planning and System Research.

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Hagen Koch 1 , Stefan Kaden 2 , Michael Kaltofen 2

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  1. WBalMo Elbe / module Czechia - application fields and first results Hagen Koch1, Stefan Kaden2, Michael Kaltofen2 1Brandenburg University of Technology Cottbus, Chair of Hydrology and Water Resources Management 2 WASY GmbH, Institute for Water Resources Planning and System Research

  2. Contents Relevance for the Overall Model Input Data and Information Development of Modules First Results Conclusion and Outlook 1. Contents

  3. GLOWA-ELBE II sub-project Surface Water Availability: investigation of changes in the water availability in the whole Elbe River Basin under global change scenarios 2. Relevance for the Overall Model • Czech Republic covers one third of the Elbe • River Basin roughly • Inflow to Germany at different locations: • Main stream of river Labe • => Decin / Labe • Sub-basin of the river Mulde • => downstream reservoir Prisecnice / Prisecnice • => downstream reservoir Flaje / Flajsk potok • Effects of climate change and reservoir • management in the Czech Republic will • in all probability have an influence on • inflow to Germany

  4. Basis for Data and Information “Agreement of co-operation” between GLOWA-ELBE II and the Czech River Basin Authorities Data and information delivered: 3. Input Data and Information • reservoirs to be included in the model (name, location, controllable storage, active storage, water surface area, etc.) => reservoirs with capacity equal or larger than 1 mill. m3 • water users, i.e. withdrawals and discharges (name, location, reference number of permit, monthly or yearly values for the last years, etc.) => quantity equal or larger than 0.01 m3/s • management of water resources facilities - e.g. water transfers between river reaches or reservoirs (name, location of intake and of orifice, capacity, etc.)

  5. Structure of the Modules … is according to the river basin districts (Povodis) in the Czech Republic Upper Vltava, Lower Vltava, Berounka, Upper and Middle Labe, Ohre and Lower Labe. 4. Development of Modules

  6. Development of Modules …on the example of the module Upper and Middle Labe Upper Vltava, Lower Vltava, Berounka, Upper and Middle Labe, Ohre and Lower Labe. rivers calculation profiles reservoirs water users 4. Development of Modules

  7. Results …for different fields/sectors and locations as example for possible kinds of analysis: Effects of climate change on natural streamflows Effects of climate change on regulated (managed) streamflows Effects of climate change for different water users Effects of climate change on filling of reservoirs 5. First Results

  8. Effects of climate change on natural streamflows 5. First Results

  9. Effects of climate change on regulated (managed) streamflows 5. First Results

  10. Safety of drinking water provision for the city of Prague Drinking water for the city of Prague is provided by three sources: Withdrawal directly from the river Vltava in Prague, Transfer from the area between the cities of Sojovice and Karany (bank filtration), Transfer from reservoir Svihov (Zelivka). Prague Prague Prague 5. First Results

  11. Reservoir Svihov (Zelivka) Comparison of real values for withdrawal (years 1991 -2004) with simulated values for all ten periods (years 2003 - 2052). 5. First Results

  12. Inflow to Germany downstream reservoir Prisecnice (at Schmalzgrube / Preßnitz) – modules for the rivers Ohre and Mulde 5. First Results

  13. Filling of Reservoirs Nechranice Rozkos Orlik Hracholusky Lipno I 5. First Results

  14. Conclusions: Climate change will affect water availability in the Czech part of the Elbe River Basin Affects will be different at different locations and within seasons (e.g. rising streamflows during winter and falling streamflows during summer and autumn) Streamflows during low flow episodes will fall generally Drinking water provision from reservoirs is sector most affected, for other water users water can be provided with high safety Under extreme dry conditions the water level in some reservoirs will fall significantly while other reservoirs are unaffected Adapted/changed management of reservoirs might compensate for some of the effects of climate change Outlook: Analysis of results in consultation of Povodis (e.g. for 4th Status Report) Inclusion of changing water demand for large water users (e.g. power stations) and calculation of effects 6. Conclusion and Outlook

  15. Thank You for your attention!

  16. Reservoir Prisecnice: DWS, comparison of real values with simulated values

  17. Filling of reservoirs

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