✅ - Urban Drainage Flashcards Preview

AQA A Level Geography - HUMAN > ✅ - Urban Drainage > Flashcards

Flashcards in ✅ - Urban Drainage Deck (17)
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What is interception?

When precipitation lands on buildings, vegetation, concrete etc before it reaches the soil. Storage is temporary, often quickly evaporated


What is vegetation storage?

All the moisture in vegetation at one time


What is surface storage?

Total volume of water held on Earth's surface in lakes, ponds and puddles


What is groundwater storage?

Water in underground permeable rock strata


What is channel storage?

Water held in a river or stream channel


How can flooding be increased in urban areas?

If run off from roofs and paved areas is piped into waterways


What are SUDS?

Sustainable Urban Drainage Systems


What do SUDS aim to do?

Control the quality and rate of run off from a development
Improve quality of run off
Enhance the nature conservation, landscape and value of site and surroundings


What are permeable pavements?

Pavements made of porous material such as concrete blocks, porous asphalt and crushed stone


Where does water go from a permeable pavement?

It may infiltrate directly into the subsoil or be stored in an underground reservoir before soaking into the ground


What are swales?

Shallow ditches with gently sloping sides that can be built into the landscape


What are the advantages of swales?

They provide temporary storage for storm water
Reduce peak flows
Facilitate filtration of pollutants
Encourage microbial decomposition


How can green roofs act as SUDS?

They reduce flow rates and improve water quality, as well as improving insulation


What are infiltration trenches?

Stone filled reservoirs to which stormwater run off is redirected


How are pollutants removed from infiltration trenches?

By absorption, filtering and microbial decomposition in the surrounding soil


What does the type of SUDS in place depend on?

The pollutants present in run off
The size of and drainage strategy for the catchment area
The hydrology of the area and infiltration rate of soil
The presence of Groundwater Source Protection Zones or contaminated land


What do SUDS aim to do?

Drain surface water in a manner that will provide a more sustainable approach than what has been standard practice of re-routing run-off through a pipe to a water course