TITLE:
Environmental Risk Imposed by Diverted Flood Waters on Water and Soils in Emergency Retention Basins
AUTHORS:
Karl Erich Lindenschmidt, Robert Harrison, Martina Baborowski
KEYWORDS:
Environmental Risk, Inundation, Retention Basins, Water Quality, Contaminated Soils, Quasi-2D Model
JOURNAL NAME:
Journal of Environmental Protection,
Vol.1 No.2,
June
29,
2010
ABSTRACT: Emergency retention basins (ERB) are diked enclosures alongside rivers into which water from the main river channel is diverted during extreme floods. If the basins are operated during extreme flooding, two negative environmental impacts may occur: 1) contamination of the soils due to their transport by suspended sediments to the basin and 2) depletion of dissolved oxygen in the basin water. A computer-based methodology is presented which was used to assess the environmental risk exhibited by the operation of an ERB system proposed for the Elbe River in Germany. The August 2002 extreme flood event was used as a test case. For such a flood, the results showed that there is a 77% risk that dissolved oxygen levels fall below 2 mg/L in the water and a 48% chance of exceeding the inspection value of 500 mg zinc/kg in the soil.