Urban Drainage Flashcards
what are SUDS
sustainable urban drainage systems
what is the aim of SUDS
to imitate natural drainage systems rather than channelling water through drains and pipes
SUDS aim to decrease….. in urban areas
flooding, water pollution and drought
what do vegetated trenches do
increase the interception of rainfall
what do retention basins do and how do they prevent flooding
store water - help to increase infiltration and water storage. this decreases run off and channel flow which lowers the flood risk. increased infiltration also decreases the amount of pollutants entering watercourses
what do vegetated roofs do
intercept rainfall and increase evapotranspiration which reduces the flood risk
containers of roofs of buildings purpose
catch and store rainwater for reuse, helps to reduce drought risk
why are SUDS more sustainable than traditional urban drainage methods
because they work with the natural environment to improve drainage and water quality. vegetated trenches and roofs also provide new habitats and increase biodiversity
SUDS do not…
directly route water – remember (why it is more sustainable)
what do swales do
provide temporary storage for storm water, reduces peak flows and filters pollutants
social benefit of wetlands
improve people’s perception of a place- aesthetically pleasing
how do permeable pavements work
pavements are made with layers of porous materials. water may infiltrate directly into the subsoil or be stored in an underground reservoir. pollutant material occurs through the material itself
