Urban drainage Flashcards
What is urban hydrology ?
How water moves through urban environments.
How can concrete affect urban hydrology ?
Concrete is impermeable so more water will gather in storm sewer systems which act like high density drainage systems then when they leave to rivers, rivers fill rapidly.
How are urban areas designed to shed water ?
Sloped roofs, rounded guttering, cambered roads.
Impacts of less natural landscapes in an urban area ?
Increased flooding risk additionally more population will mean more people at risk.
What are other risks that need to be managed instead of flooding ?
Pollutants creating foul drinking water supplies.
Sediment from erosion fills spaces between rocks on stream bottom reducing living space for biological communities.
Name a fail-safe strategy ?
LA river directed through built channel but has removed ecosystems and if the system were the be severely damaged the system would paralyse it and they built it due to a flash flood in the 1930s. Hard engineering strategy.
Name a safe-to-fail strategy ?
SUDS - alternative to hard engineering e.g Swales.
What is SUDS and an example ?
Approach to managing rainfall using natural processes to reduce flooding. An example is roof water collected in water butts for use in garden or flows to grass channels called Swales - then travelled to grass basins where its stored then released. HEARTLANDS.
