Abstract
Abstract One of the challenges in urban stormwater management is to identify a suitable stormwater management method which will be socially, technologically and economically viable. In this paper, a study on the effectiveness of decentralized and interconnected percolation ponds as a stormwater harvesting technology, for a partially urbanized (semi-urban) catchment is presented. When applied to a case study region in Katpadi, Tamil Nadu, the results were encouraging. The investment required for implementing the proposed stormwater harvesting came to be about ₹555 Million for Option I and ₹714 Million for Option II. The annual volume of water that can be added to the groundwater system through infiltration from the ponds was found to be 1.22 Mm3 in the case of Option I and 0.74 Mm3 in the case of Option II. The percentage area under stormwater harvesting for the entire catchment was found to be 6.14% under Option I and 9.36 under Option II. The hydrologic performance of the proposed stormwater harvesting system indicated that for peak runoff values Option II is more efficient (in terms of minimizing runoff volume) compared to Option I; however, for daily rainfall values, Option I is hydrologically more efficient when compared to Option II.
Highlights
With growing urban population and urban water demand, stormwater harvesting (SWH) is becoming one of the preferred approaches for stormwater management in urban areas
When applied to a catchment unit, the duration of rainfall in the intensity distribution function (IDF) equation was taken equivalent to the time of concentration of the catchment unit (a valid assumption made in the application of rational method (Chow et al )
The results indicated that the performance of percolation ponds in reducing the peak runoff is better for Option II when compared to Option I, under all three domains
Summary
With growing urban population and urban water demand, stormwater harvesting (SWH) is becoming one of the preferred approaches for stormwater management in urban areas. Conventional urban stormwater systems do not have the provision for harvesting stormwater, rather they were mostly built for safely discharging the excess runoff from impervious areas (Burns et al , ).
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