What purpose does a Stormwater retention pit serve?
Stormwater runoff is an accumulation of excess rainwater that flows into larger water bodies and local storm sewer systems extensively due to the surrounding prevalence of hard surfaces such as concrete. Large quantities of water would ordinarily be absorbed into the ground in a more natural environment than entering streams and lakes. Stormwater runoff gathers pollutants, chemicals, and debris as it flows over paved surfaces and into water bodies. It also causes erosion, decreases and eliminates groundwater recharge, and modifies aquatic environments. Hence there is a dire need for a stormwater retention pit.
Stormwater Retention pits or wet ponds are ponds established to treat and store stormwater runoff. Retention pits are permanent pools of standing water and gradually empty into a receiving water body. Forebays can be incorporated in the design of a retention pit to pre-treat the stormwater before it spills over into the major water feature. Water is treated through sedimentation as well as nutrient uptake.
What are the inherent benefits of stormwater retention pits?
- Improvised water quality in surrounding water bodies: Stormwater retention pits manage stormwater with respect to quantity and quality, thereby decreasing the transfer of pollutants and chemicals into nearby water bodies.
- Aesthetic appeal: Stormwater retention pit may enhance and augment the aesthetics through plant selection, plant placement, topography, and pedestrian access alternatives.
- Augmented biodiversity: Biodiversity is defined as the variation of life forms in a given ecosystem. Vibrant landscaping with ponds and different varieties of plants can add to the natural environment.
- Wildlife habitat: Stormwater retention pits serve as natural habitats for animals, organisms, and insects.
- Water Conservation: Water stored in stormwater retention pits is available for non-potable human uses such as irrigation.
- Flood Prevention: Stormwater retention pit reduces and minimises the risk of flooding in nearby areas.
- Minimisation of erosion: Stormwater retention pit reduces and minimises erosion in the nearby area and along the banks of water bodies.
Features:
A stormwater retention pit or detention system is an underground pipe system that stores surface runoff. These systems are peculiarly sized in newly advanced developed areas to maintain the runoff rate before the development. Existing storm sewers, ditches and other waterways prevail within their inherent capacity. Underground pipe networks permit the land above the system to be employed for recreation, parking, and other purposes.
The sole decision to opt-out of a stormwater retention pit system or a detention system is peculiarly determined and ascertained by local environmental regulations or the groundwater situation. A stormwater retention system peculiarly employs perforated pipe so that the stored runoff can recharge groundwater and a discharge outlet, which is designed to restrict the flow rate into the receiving sewers or channels. A stormwater retention pit and detention system peculiarly employ non-perforated pipe and watertight joints. The stored runoff gets cleared off only through the regulated and streamlined outlet.
Conclusion:
To summarise, one of the significant considerations in stormwater retention pit and management development is runoff and flow control, specifically for newer developments where buildings, parking lots, roads, and other artificial surfaces replace open space.
