Stormwater management and its role in the larger challenge of preservation of water quality around the world is an evolving issue. As commercial development continues at record levels, both the quantity of runoff and water quality are issues that need to be looked at carefully. The engineering community is being pushed to design new solutions that keep groundwater and surface water ecology safe and that also protect development economics.
Although China ranks sixth in the world in total water resources, there is a shortage. The average water resources per capita is 2,300 m3, making it only one fourth of the world average per capita, while the unit plantation area of water resources is only one half the world’s average value.
Groundwater resources throughout northern China are drying up at an astonishing rate.
Effects of Recharge of Chlorinated State Water Project Waters to Groundwaters in Lancaster Area of California
As the population in Southern California increases, more and more demands are being put on the state’s groundwater resources, further exacerbating the overdraft problem. Many communities in Southern California are recharging their aquifers with imported surface waters to combat this problem. The major recharge normally is carried out during wet weather periods when surface water is plentiful. However, recharging these groundwater aquifers with imported surface water can create the potential for water quality degradation. The problem can start when surface water is disinfected with chlorine to prevent biofouling and remove pathogens.
Groundwaters in many parts of California are an important sole source of water supply. However, in some areas indiscriminate pumping has lowered aquifer levels by hundreds of feet. This has caused sediment compaction and ground subsidence.
Groundwater sources that can be used for drinking water purposes are requiring increasing degrees of treatment to meet the requirements of both the regulating agencies and the consumer.
In response to growing concerns over water quality issues in the Wash, a committee has developed a comprehensive adaptive management plan to save this primary outlet for water flows.
When tank settlement is anticipated, certain precautions must be taken to assure that the tank settles properly.
At Work on Groundwater Treatment
Fourteen entities came together to repair and restore a storage reservoir tank that was showing signs of advanced deterioration both inside and out.
When ground water contamination is discovered at a site, a host of questions must be answered before it can be effectively removed or minimized. Battelle Memorial Institute, an international research organization headquartered in Columbus, Ohio, has recently developed a statistical approach for assessing natural attenuation of contaminants. This approach can be used to estimate how quickly contaminants can be remediated using biological methods.
At Work on Groundwater Treatment Processes