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.
Highlights
After the extreme flood event along the Elbe River in August 2002, efforts were made to revamp flood management schemes in the river basin
Emergency retention basins (ERB) are diked enclosures alongside rivers into which water from the main river channel is diverted during extreme floods
The construction of an emergency retention basin (ERB) system has been proposed for the middle reaches of the Elbe River to reduce flood risk in the area [2]
Summary
After the extreme flood event along the Elbe River in August 2002, efforts were made to revamp flood management schemes in the river basin. The construction of an emergency retention basin (ERB) system has been proposed for the middle reaches of the Elbe River to reduce flood risk in the area [2]. The floodwater diversion reduces water levels downstream in the river and inundated areas and alleviates stress and damages in regions prone to high flood risk. A preliminary assessment of the environment risk of heavy metal soil contamination and dissolved oxygen depletion in ERBs should be given. To solve these goals, excerpts have been drawn from [3,4,5,6]
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