Flood management measures

Canal and rill

Canals and rills are open surface water channels with hard edges. They are simply channels that water flows along whereby they can have a variety o...

Deculverting of watercourses

Daylighted Saw Mill River in Getty Square, Yonkers, New York. Previously, the river was covered by a parking lot

This activity involves techniques to resolve the issues created by culverted watercourses. This is predominantly through deculverting, or ‘daylight...

Filter trench

Filter trenches are shallow excavations filled with rubble or stone that create temporary subsurface storage of stormwater runoff. These trenches c...

Multi-layer safety as a central concept for flood protection

Multi-layer safety, prevention, sustainable spatial planning and disaster management © Beleidsnota Waterveiligheid 2009-2015

The central concept for the revised water safety policy is formed by 'multi-layer safety'. In this concept safety is assured through multiple layer...

Rain garden

A rain garden is a planted depression or a hole that allows rainwater runoff from impervious urban areas, like roofs, driveways, walkways, parking ...

Sunken lane

A hollow way (chemin creux) at La Meauffe, Manche, France

A sunken lane (also hollow way or holloway) is a road or track which is significantly lower than the land on either side, not formed by the (recen...

Swale

A swale is a low tract of land, especially one that is moist or marshy. The term can refer to a natural landscape feature or a human-created one. A...

Flood management measures

Name	Definition	Co-benefits and impacts	Conditions
Canal and rill	Canals and rills are open surface water channels with hard edges. They are simply channels that water flows along whereby ...	Canals may also serve as treatment channels, they collect water, slow it down and provide storage for silt and oil ...
Deculverting of watercourses	This activity involves techniques to resolve the issues created by culverted watercourses. This is predominantly through deculverting, or ‘daylighting’ which ...	Re-opening existing culverts can deliver a wide range of direct and indirect benefits, including direct benefits to salmonids, eels, coarse ...
Filter trench	Filter trenches are shallow excavations filled with rubble or stone that create temporary subsurface storage of stormwater runoff. These trenches ...	Water quality treatment is one of filter trench's main advantages. Amenity and ecology potential are additional ones but lower in ...
Multi-layer safety as a central concept for flood protection	The central concept for the revised water safety policy is formed by 'multi-layer safety'. In this concept safety is assured ...	-
Rain garden	A rain garden is a planted depression or a hole that allows rainwater runoff from impervious urban areas, like roofs, ...	Another purpose of a rain garden is to improve water quality in nearby bodies of water. Rain gardens can cut ...	Rain gardens should be designed for specific soils and climates. Native and adapted plants are recommended for rain gardens because ...
Sunken lane	A sunken lane (also hollow way or holloway) is a road or track which is significantly lower than the land ...	Hollow roads or sunken channels can hold and drain much more water than gutters. Slopes are often less of an ...
Swale	A swale is a low tract of land, especially one that is moist or marshy. The term can refer to ...	Vegetation in swales allows for filtering of pollutants, and infiltration of runoff into groundwater. Densely vegetated swales can be designed ...