Integration of rainwater harvesting & recharge systems with storm water drainage design
Rainwater harvesting techniques
To minimize the quantity of storm runoff reaching to the storm water drains, a certain quantity of storm water can be stored / percolated by introducing suitable techniques as below: I.In-situ storage / percolation within or around premises II.Storage of runoff in nearby pond / water tank III.Percolation of storm water inside / outside the drains along its stretch IV.Spreading water for recharge in low lying areas and parks / gardens etc. V.Disposal to reservoir / water body
In-situ storage / percolation
The design guidelines of RWH system is given in 9.3.1.1 of CPHEEO Manual
Conveyance System Conveyance system includes gutters and downpipes ending at common collection chamber.
Size of Rain Water Pipes for Roof drainage
The broad idea about the particular diameter of pipe which will be required to cater the certain roof surface area for given average rate of rainfall in mm/hr is shown in Table 9.2
Percolation of runoff into ground
Percolation pits
This method is suitable where a permeable stratum is available at shallow depth. It is adopted for buildings having roof area up to 100 sqm. Recharge pit of any shape is constructed generally 1-2 m wide and 2-3 m deep. The pit is filled with boulders, gravel, and sand for filtration of rainwater.
Percolation trenches
This method is used where permeable strata are available at shallow depth. It is suitable for buildings having rooftop area between 200 & 300 sqm. In this method, trench of 0.5-1.0 m wide, 1-1.5 m deep and of adequate length depending upon rooftop area and soil/subsoil characteristics should be constructed and filled with boulders,
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Urban Infrastructure and Network Study notes for M. plan Sem-III
Urban Infrastructures & Network.pdf
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