Risk area identification, mapping and designation

By

A proper hazard and risk assessment (with informative maps as central outputs) is the essential basis for starting an integrated risk management process. The assessment is a challenging multistep task, which requires – aside from clear objectives – input data (e.g. about historic events and damages, terrain and landuse data), methodological skills and decisions as…

Decommissioning of farmland and forest roads

By

Small (unsealed) roads within forests and on farmland often cause surface runoff and erosion or they are damaged themselves in case of heavy rain. Furthermore, the road density can have a decisive influence on the water drainage of larger areas. Existing road network within forests and on farmland should be checked for its necessity and…

Risk reducing during cutting and remediation procedures

By

The measure resides in eliminating the risk of forest soil damage due to cutting. Specifically, the measure includes for example use of cable transport systems, caterpillar tractors, and avoidance of transport in the same routes. If damages of the forest soil occur, it is necessary to remediate them immediately in order not to disrupt the…

Drainage ditches; swales

By

Ditches allow intercepting, infiltrating and alternatively draining the surface runoff without causing damage. They should be dimensioned to the corresponding return period of the discharge, meet functional requirements and get regular control and maintenance. Ditches on farmland are usually proposed in areas where the space for constructing furrows is limited. Within urban areas they are…

Small retention reservoirs

By

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…

Dry detention reservoirs and depressions of any capacity

By

Natural or artificially created detention basins and depressions with a specific retention capacity can be used as temporary water reservoir for runoff water during heavy rainfall. They slow down the surface runoff; thus they contribute to a delay and attenuation of flood waves. They should be located at the deepest point in almost any surrounding…