Reservoirs can be classified, among other criteria, according to size, however, the classification varies from country to country (e.g. CZ <2 000 000 m³ in parts smaller than 100 000 m³). For heavy rainfall risk management, small reservoirs on smaller water courses are of particular importance. They can protect objects in risk areas from the negative effects of floods after heavy rain and from the transported soil particles from erosion processes. The measure requires an occupation of (often agricultural) land. Therefore, settlement of property rights relations is necessary. Design documentation, planning permission, and realization might be demanding.
Fields of action
Additionally to flood risk reduction by slowing and storing surface runoff, the measure has medium or high possible benefits for the following biophysical impacts and ecosystem services: Biodiversity preservation; Aesthetic/cultural value; Intercept pollution pathways; Reduce erosion and/or sediment delivery; Create aquatic habitat; Filtration of pollutants; Water storage; Natural biomass; production; Climate change adaptation and mitigation; Recreational opportunities; Increase evapotranspiration; Create riparian habitat
Výzkumný ústav vodohospodářský TGM (2018): Katalog přírodě blízkých opatření pro zadržení vody v krajině [Catalogue of green water retention measures in the landscape], URL: http://www.suchovkrajine.cz/vystupy (25.03.2020): Malé vodní nádrže
Výzkumný ústav vodohospodářský T. G. Masaryka. v.v.i.
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