urban drainage Flashcards
urban influence of hydrographs
- short lag time
- steep rising limb
- high peak discharge
- lower base flow
SUDS
natural processes in landscapes to reduce and control flooding
SUDS aims
- storing runoff
- harvesting rain
- allowing infiltration
- filtering pollutants
SUDs - swales
- shallow broad and regulated channels designed to store and convey runoff and remove pollutants
- promotes infiltration
SUDs - wetlands
- stormwater attenuation and treatment
- slow flows for extended periods
SUDs - retention basins
- excarted basins act as holding ponds for water, store during flood events
SUDs - permeable pavements
- open gravel beneath filters runoff
- rain gardens allows infiltration into soil and into groundwater
lamb drove, cambourne - original aim
practical and innovative sustainable water management techniques within new residential developments
- SUDs are viable and an alternativ to traditional forms of drainage
lamb drove, cambourne - measures
- permeable paving
- green sedum roof
- swales
- detention basins
- retention ponds
river restoration
ecological, physical and spatial practices aimed at restoring the natural state and functioning of the river system in support of biodiversity, recreation, flood management and landscape development
river restoration - the cheonggyecheon project in seoul - context
- 3% decrease in summer temps
- 10m+ population
- built over a seasonal stream
river restoration - the cheonggyecheon project in seoul - reasons and aims
- 88% in favour
- freeway and concrete deck were a safety risk
- to improve connectivity
- little green space
river resoration - the cheonggyecheon project in seoul - attitudes and contributions
- 50k visitors per week
- resotration of seasonal stream
- transportation experts concerned that removing the elevated highway will increase traffic
- carried 169k people per day
