Survey of efficiency of erosion and flood control measures at the Němčický stream

Abstract

The article presents the initial part of the research of the efficiency of erosion and flood control measures designed in the experimental basin of the Němčický stream. A long term observation of discharges, rainfalls, and some water quality indicators was introduced at 2 experimental profiles. We have elaborated a study of the erosion threat for discovered areas, where the realisation of protective measures is necessary to reduce soil loss. Besides the erosion control, the sheet grassing contributes to a better water retention by the agricultural countryside. The efficiency of the designed measures ascertained by model evaluation proved that grassing of 49 ha of arable land (from total 183 ha) and the exclusion of erosive dangerous crops growing (on 21 ha) should decrease the centenary discharge by 18% and the amount of the transported suspended matter by 29%. The observation will continue after realisation of the erosion control measures and of a polder, which was designed for sufficiently effective flood protection, and the measurements will be compared with the preliminary and model values.

Keywords

• sheet water erosion
• flood
• extreme rainfall - runoff events
• protective measures
• efficiency
• complex land use adjustment
• ercn