As
outlined in the previous chapter the storage
of run off of rain water is practiced in places
where there is copious rainfall spread over
throughout the year.
·
Rain water harvesting (Individual house)
· Rain water harvesting through
percolation pits (Individual house)
· Rain water harvesting through
pebble bed (Building complex)
· Rain water harvesting through
well - cum canal - cum percolation method
· Rain water harvesting through
open wells
· Rain water harvesting through
service cum recharge well method
· Rain water harvesting through
defunct borewell & openwell (Both domestic
and irrigation)
· Rain water harvesting through
broken brick method
· Rain water harvesting through
recharge wells & open ground
· Bathing water & store water
drains
· Stopping rain water rushing
out of the gate by the draft wall
· Regular repairs of compound
wall
· For agricultural lands, Farms,
etc
· Recharging of wells in agricultural
land
· Roof top water collection and
recharge
· Decentralized percoaltion through
water spreading and longitudinal trenches
· Centralized percolation through
pits
· Recharge through shafts
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STORAGE
(Groundwater Reservoirs)
|
Rooftop
rainwater collected may be recharged to Groundwater
reservoir through :
·
Abandoned dug well
· Abandoned / running hand pump
· Recharge shaft
· Defunct borewell
· Trench / pit with injection
well
Some simple methods of storage adopted in villages
are explained below :
|
Small
storages tank , ground level (Suitable
for individual houses)
|
A
simple roof top railn water harvesting as practiced
in some villages using split pipe or GI valley
sheets or Bamboo directing the flow from roof
top to a small drum or plastic tank
If there is a group of houses, the owners can
collectively lead the rain water into a sub
surface tank situated in a common place and
use later as per the illustration
Another
simple method of storage is letting the rain
water into the existing well through a filter
media consisting of the following
Layer 1: Layer of sand - fine to medium (150
mm to 300mm)
Layer 2: Layer of gravel (200mm)
Layer 3: Layer of medium pebbles bed (500)
There
are certain limitations in adopting storage
method, in places where the monsoon period is
only 3 to 4 months sa we require a large quantity
of storage tanks of bigger dimensions, and preservation
of water in the tanks for longer period is also
hazardous. Hence, we have to go in for recharging
method.
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