Hydrological Analysis For Planning Rooftop Rainwater Harvesting of Urban Area

Phool Chand Diwan

doi:https://doi.org/10.14445/23488352/IJCE-V7I1P103

Research Article | Open Access

Volume 7 | Issue 1 | Year 2020 | Article Id. IJCE-V7I1P103 | DOI : https://doi.org/10.14445/23488352/IJCE-V7I1P103

Hydrological Analysis For Planning Rooftop Rainwater Harvesting of Urban Area

Phool Chand Diwan, Hari Krishna Karanam

Citation :

Phool Chand Diwan, Hari Krishna Karanam, "Hydrological Analysis For Planning Rooftop Rainwater Harvesting of Urban Area," International Journal of Civil Engineering, vol. 7, no. 1, pp. 11-15, 2020. Crossref, https://doi.org/10.14445/23488352/IJCE-V7I1P103

Abstract

Increase in the impervious surface in general increases the volume of stormwater runoff, and there is a reduction in groundwater recharge to the aquifer below. In India, about 310 administrative blocks are over-exploited where groundwater is withdrawn more than its replenishment from rainfall. The groundwater levels have declined by more than 4 meters in 40 districts of 16 states in the country during the last decade, and urban areas are most vulnerable. Roof water harvesting and artificial recharge can be a better action plan in urban areas to control rainwater, surface water and groundwater interaction and towards conservation of quantity and quality of water resources. Practices such as roof water harvesting and artificial recharge need to be evaluated as alternate interventions to undertake such restoration of natural conditions in urban areas. For planning water harvesting systems, the long term daily as wells as short term sub-hourly data are equally important. Long term data on normal rainfall and number of rainy days is important to plan roof water harvesting potential and design of harvesting systems requires information on sub-hourly rainfall intensity. Information on the intensity of rainfall over an urban watershed and the resulting stormwater runoff is needed to design the size of any artificial recharge structure for proper restoration of declining groundwater levels.

Keywords

Roof water harvesting, artificial recharge, groundwater and rainfall

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