Run-off water from rain contains a lot of debris, sediments, oil, and waste. At this stage, the water is unfit for any usage. Through a proper stormwater management system, this water can be cleaned and put to better use. There’re two basic systems of stormwater management. One is above-ground stormwater management, where the run-off is collected above-ground in open ponds and sewers. The other is under-ground stormwater management where the run-off is collected sub-surface in tanks and chambers.
Even though the above-ground system has its merits, there’re certain limitations to be considered. The biggest concern is maintaining the quality of run-off. Let’s see why this is an issue -
The run-off is collected in open ponds and sewers. Water stays in the open ponds for as long as the sediments need to settle to the bottom. The debris and other bigger particles float on the top and are later removed by filtration.
The unclean water remains in open space for months. Open stagnant water becomes a breeding ground for mosquitoes. The mosquitoes are capable of spreading several diseases. According to the Pennsylvania Department of Environmental Protection, stormwater in open catch basins are significant production areas for mosquitoes, typically those that cause West Nile virus. Such is the intensity of the disease that until now there are no vaccines to prevent or medicines to cure the disease. Mentioned in the report is the fact that mosquitoes need at least four days of larval development to reach adulthood. That means that storm water retention basins that contain water for more than a week following a rain event can pose a severe health concern by being a perfect ground for the growth of these mosquitoes.
Water in open space are also open to liabilities. Often it becomes challenging to pave a very large periphery. An unfenced waterbody and steep slopes of ponds are accident prone areas. They might lead to drowning accidents if people are not cautious enough while roaming near pond area.
On the other hand, under-ground stormwater system stores water sub-surface after filtering out pollutants and oil from the run-off. Early treatment of water ensures it remains safe and fit for usage other than drinking. This system has got tanks for storing water that are built below the surface of land while the surface above the ground can be used for a commercial purpose like the development of athletic grounds, parking area or pavement. Under-ground stormwater management systems ensure quality of water by treating water early and then storing it in sub-surface tanks. These tanks are closed containers with lots of open spaces for massive storage.
If you want to learn more about underground stormwater solutions, click here