Case study Havel-Spree (Germany) Peter Krahe, Anna Dorothea von Eschenbach, Enno Nilson Referat M2 „Wasserhaushalt, Vorhersagen und Prognosen“ Bundesanstalt für Gewässerkunde, Koblenz 1
Water statistics in Germany (DESTATIS)
Havel-Spree River Basin Tributary to River Labe/Elbe AEo= 24096 km² 6.351.100 Inhabitants 264 inhabitants / km²) time period 1971-2000 for WEI+ water demand (status 2007)
Water balance components
WEI+1 +2 +3 +4
WEI+6 +7
WEI+8 +9
WEI+1 +2 +8 +9
Conclusions
Conclusions > no single index, a combination of WEI+1 and WEI+2 or WEI+4 and WEI+3 > Option 1: communicate the range of a water stress situation in a river basin by use of 2 indices > Option 2: Study/discuss with WEI+1 index and apply an “multiplicative adjustment factor” WEI++ = Fadjustment X WEI+1 (or modified WEI+3) > use long term means instead of individual years (e.g. 10 years) > clearly separate “water stress” from “water drought” (evaluation scheme)
Thank you for your attention Peter Krahe Referat M2 – Wasserhaushalt, Vorhersage und Prognosen Bundesanstalt für Gewässerkunde, Koblenz Am Mainzer Tor 1, 56068 Koblenz Tel.: 0261/1306-5234 Fax: 0261/1306-5302 E-Mail: krahe@bafg.de Web: http://www.bafg.de/M2 11