Channels and rills

Title Channels and rills
Description
Preview image No image
Preview image caption
Creators fullname Laszlo Cseh
Contributors fullname
NWRM_measure
Measure sector Urban
Measure summary

Channels and rills are shallow open surface water channels incorporated in to the start of a SuDS train. They collect water, slow it down and provide storage for silt deposited from runoff. They can have a variety of cross sections to suit the urban landscape, and can include the use of planting to provide both enhanced visual appeal and water treatment.

The main role of channels and rills are to capture runoff at the start of a SuDS train, allow deposition of sediment and convey the runoff to downstream SuDS features.  They can also be used in between SuDS features as connectors.  They collect water, slow it down and provide storage for silt and oil that is captured. The outlets are designed to act as a mini oil separator, making them effective at treating pollution and reducing treatment requirements downstream. Clearly channels can be included in many situations and settings, but would not always considered to be NWRMs unless specifically designed to perform these functions and used in conjunction with other measures.

Planting in channels and rills can visually enhance the urban landscape and offer biodiversity and amenity value. These features can be applied to all new developments and can be retrofitted to existing developments.

Possible benefits with level
Benefits Level
ES3 - Natural biomass production
Low
ES4 - Biodiversity preservation
Low
ES5 - Climate change adaptation and mitigation
Low
ES7 - Flood risk reduction
Low
ES8 - Erosion/sediment control
Low
ES9 - Filtration of pollutants
Low
ES11 - Aesthetic/cultural value
Medium
PO9 - Take adequate and co-ordinated measures to reduce flood risks
Low
PO11 - Better protection for ecosystems and more use of Green Infrastructure
Low
PO14 - Prevention of biodiversity loss
Low
BP1 - Store runoff
Low
BP2 - Slow runoff
Medium
BP5 - Increase evapotranspiration
Medium
BP6 - Increase infiltration and/or groundwater recharge
Low
BP9 - Intercept pollution pathways
Medium
BP10 - Reduce erosion and/or sediment delivery
Low
BP12 - Create aquatic habitat
Low
BP14 - Create terrestrial habitats
Low
BP16 - Reduce peak temperature
Low
BP17 - Absorb and/or retain CO2
Low
Case studies
Other sector Agriculture
Biophysical impacts { "value": [ { "code": "BP1", "name": "BP1 - Store runoff", "level": "Low" }, { "code": "BP2", "name": "BP2 - Slow runoff", "level": "Medium" }, { "code": "BP5", "name": "BP5 - Increase evapotranspiration", "level": "Medium" }, { "code": "BP6", "name": "BP6 - Increase infiltration and/or groundwater recharge", "level": "Low" }, { "code": "BP9", "name": "BP9 - Intercept pollution pathways", "level": "Medium" }, { "code": "BP10", "name": "BP10 - Reduce erosion and/or sediment delivery", "level": "Low" }, { "code": "BP12", "name": "BP12 - Create aquatic habitat", "level": "Low" }, { "code": "BP14", "name": "BP14 - Create terrestrial habitats", "level": "Low" }, { "code": "BP16", "name": "BP16 - Reduce peak temperature", "level": "Low" }, { "code": "BP17", "name": "BP17 - Absorb and/or retain CO2", "level": "Low" } ] }
Ecosystem services { "value": [ { "code": "ES3", "name": "ES3 - Natural biomass production", "level": "Low" }, { "code": "ES4", "name": "ES4 - Biodiversity preservation", "level": "Low" }, { "code": "ES5", "name": "ES5 - Climate change adaptation and mitigation", "level": "Low" }, { "code": "ES7", "name": "ES7 - Flood risk reduction", "level": "Low" }, { "code": "ES8", "name": "ES8 - Erosion/sediment control", "level": "Low" }, { "code": "ES9", "name": "ES9 - Filtration of pollutants", "level": "Low" }, { "code": "ES11", "name": "ES11 - Aesthetic/cultural value", "level": "Medium" } ] }
Policy objectives { "value": [ { "code": "PO9", "name": "PO9 - Take adequate and co-ordinated measures to reduce flood risks", "level": "Low" }, { "code": "PO11", "name": "PO11 - Better protection for ecosystems and more use of Green Infrastructure", "level": "Low" }, { "code": "PO14", "name": "PO14 - Prevention of biodiversity loss", "level": "Low" } ] }
Measure code U05
Layout
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Contents
Channel in urban area

Source: http://www.susdrain.org/delivering-suds/using-suds/suds-components/swales-and-conveyance-channels/channels-and-rills.html