Before and After Urbanization Increase: runoff ·Imperviousness runoff ·Drainage Slope infillation ·Direct Runoff base flow infiltation base flow Decrease: Evapotranspiration ●Recharge Pre-Development ●Base Flow Post-Development
Before and After Urbanization
Rainwater issues related to high-rate urbanization 水灾害频现 水资源短缺 水环境恶化 Frequent Flood Scarcity of Water Deterioration of water Nuisance Resource Environment 汇流时间缩短 雨水资源流失 径流污染严重 Shortened confluent Waste of Stormwater Runoff Pollution time 地下水位降低 面源控制较难 峰值流量增大 Descending of ground Non-point source Increasing Peak flow rate water level pollution control
雨水资源流失 Waste of Stormwater 地下水位降低 Descending of ground water level 水资源短缺 Scarcity of Water Resource Rainwater issues related to high-rate urbanization 径流污染严重 Runoff Pollution 面源控制较难 Non-point source pollution control 水环境恶化 Deterioration of water Environment 汇流时间缩短 Shortened confluent time 峰值流量增大 Increasing Peak flow rate 水灾害频现 Frequent Flood Nuisance
40%evaporation 海绵城市 sponge city 30%evaporation 10%surface runoff 50%sneeping,storage 30%evaporation 城镇化之前 55%surface runoff Before 15%seeping,storage urbanization 城镇化之后 After 20%surface runoff urbanization 50%seeping,storage
40% evaporation 10% surface runoff 50% sneeping, storage 30% evaporation 55% surface runoff 15% seeping, storage 30% evaporation 20% surface runoff 50% seeping, storage 城镇化之前 Before urbanization 城镇化之后 After urbanization 海绵城市 sponge city
China Daily-March 22,2012 Southern Daily News,March 21,2012 Vice Premier Li Keqiang urges swift finish to landmark South-North water diversion project (Central Line) Water shortages in North China will remain..Well into the near future,but the project will solve the situation Li said "Other measures should also be utilized, such as conservation and combating water pollution.(We need to change our notion that Quantity and Quality are separate issues.Examples include:Tai Lake algae,etc.In 2012,the Long River Cd problem,Wuhan odor..) During the 2012 People's Congress,delegates introduced a bill suggesting stronger "source water protection"measures that would implement regulations on source water protection in accordance with the classification of water uses
China Daily – March 22, 2012 Southern Daily News, March 21, 2012 • Vice Premier Li Keqiang urges swift finish to landmark South-North water diversion project (Central Line) • Water shortages in North China will remain.. Well into the near future, but the project will solve the situation • Li said “Other measures should also be utilized, such as conservation and combating water pollution. (*We need to change our notion that Quantity and Quality are separate issues. Examples include: Tai Lake algae, etc. In 2012, the Long River Cd problem, Wuhan odor..) • During the 2012 People’s Congress, delegates introduced a bill suggesting stronger “source water protection” measures that would implement regulations on source water protection in accordance with the classification of water uses