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urban drainage (methods (river straightening - strengths - increases…
urban drainage
methods
river straightening - strengths - increases discharge speed to move through the area more quickly, weaknesses - concrete is ugly and expensive can be £5000/metre, detrimental to wildlife
natural levees - strengths - renewable and sustainable as made from natural materials, weaknesses - can be made out of concreete which is expensve to buy and maintain
diversion spillways (flood relief channels) - strengths - can create new habitats and wetlands fr wildlife and new recreational opportunities, weaknesses - expensive to dredge a new river channel
afforestation - strengths - increase interception and reduce throughflow and surface run off, evapotranspiration takes up water that would end up in the river, weaknesses - trees take bare long to grow
floodplain zoning - strengths - reduces the impacts of flooding in urban and rural areas, weaknesses - restricts economic development of area
river restoration - strengths - restores river back to nature, weaknesses - waste of original money spent on artificial methods
CASE STUDY - Lamb Drove
water butts collect water in the garden, swales, green sedum roof for run off, permeable paving
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travels through a series of swales, detention basins, and wetlands until it reaches the final retention ponds.
river restoration
benefits - returns to natural way, encourages the formation f habitats, visually appealing, low maintenance
issues - hard engineering is removed, making original work a waste of time and money, costs money for removal
river skerne - straightened and channelised in 1850 - 1945 to accommodate for urban sprawl, dredging undertaken to reduce flood risk, soft revetments on the outer banks of the river to restore meanders, since restored a 2km stretch into wetland thriving with wildlife, improved a brownfield site
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What are SUDS?
natural environmentally friendly drainage systems, can be used in both urban and rural areas.
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