Contemporary Urban Environments - Urban Drainage Flashcards
What is a sustainable urban drainage system (SUDS)?
This is a relatively new approach to managing rainfall by using natural processes in the landscape to reduce flooding, control flooding and provide amenity for the community.
What are the two types of SUDS?
Grey SUDS and Green SUDS
What are two examples of Grey SUDS?
1) Permeable pavements
2) Storage tanks
What are permeable pavements?
Precipitation falling on surfaces is infiltrated through permeable paving, where it is either filtered and stored in the stone or tanks below or flows on to grass channels before joining a part of the SUD system. This can be suitable even in the most densely built-up areas.
What are storage tanks?
Hold rainwater for slow release back into the drainage system. They do not provide wider benefits of green infrastructure and pumping may be required to empty the tank into the drainage system.
What are two examples of Green SUDS?
1) Swales
2) Green Roofs
What are swales?
Shallow, broad and vegetated channels designed to encourage infiltration and runoff moisture. They can be used alongside roads, footpaths or railway lines. They aim to protect areas downstream.
What are green roofs?
Part of a building that is covered with vegetation. Provides an area to offer retention of water, as well as providing habitats, insulation and amenity space.
What is the Thames Tideway, London?
- A new 25km sewage system built underneath the River Thames to capture, store and transfer any excess sewage and rainwater that usually flows into the river.
- Will help reduce the amount of untreated sewage that is released into the Thames.
- Cost $4.2 billion (funded by Thames Water).
- Started in 2016 and aims to be completed by 2025.
- Increased levels of noise and air pollution, congestion and many believe green infrastructure would have been sufficient.
What is the case study for river restoration and conservation?
Cheonggyecheon river, Seoul, South Korea
