1. Urban flooding
Groundwater Depletion
Whatis a RechargeWell
Howdoesrechargewelllookincommon areas
1 2
Recharge well in parks Recharge well in storm-
water drain with concrete
cover slab
Recharge well outside the drain with
leaves trap and grill
3 4
Howdoesrechargewellincommon areas
Park
Overflow water
from storage tank
to Stormwater
drain
Club House
Filter
House
Stormwater
runoff
Stormwater drain
Paved surface
Overflow water
and stormwater
runoff to recharge
well
Filter
Storage Tank
For more information please visit
the site www.bengaluru.urbanwaters.in
BestPracticesforWaterManagement
1. Know your water source like Wells, Borewells, lakes and Rivers.
2. Keep tracking water quality.
3. Don’t use more water than you need.
4. Adopt Rainwater harvesting for Rooftop and Surface runoff.
5. Ensure proper treatment of wastewater, reuse where possible
and ensure responsible discharge of the same.
6. Share your data with the city and remember that the plumber,
well digger and the mason are your partners.
Well
Lake
Recharge Well
Storm Water Drain
Fractured Zone
Bed Rock
Bore Wells
Top Soil
Unconfined Shallow Aquifer
Deep
Aquifers
Rainwater harvestinginLayouts
WHATISRAINWATERHarvesting?
Rainwater Harvesting (RWH) is the process of collecting and
storing rainwater falling on our rooftops for future use.
The surface runoff from the paved and unpaved areas can
be used for groundwater recharge through recharge wells.
Rainwater Harvesting helps address
1. Recharge groundwater
2. Reduce flooding
1. Plots / Individual household
• Each house can store rooftop water or can create recharge well
at the Plot / household level
2. Rainwater Harvesting in common areas:
• Rooftop RWH for Clubhouse
• Community recharge wells in storm water drain and common
area like parks
A recharge well is a big hole in the ground through which rainwater
goes into the earth and becomes part of groundwater. Over a
period of time recharge wells can start yielding water. If the wells
has water, this water should be tested and used appropriately
based on water quality. Wells with water can also be used as
recharge wells.
TwinProblemin a layout
Supported by Implemented by
ITC MISSION SUNEHRA KAL

2. Plan of Layout
Howmuchwatercanbeharvested
RainwaterHarvestingfor
Layouts
Dos andDon'ts
1. The recharge wells can be located in or close to storm water drain
and borewells.
2. While locating the recharge wells, sufficient distance should be
maintained from the sewage chambers, transformer yard, electrical
and cable lines.
3. It is better to locate the recharge wells away from driveways,
where there is no heavy vehicle movement. Concrete rings and
concrete cover slabs need to be reinforced, to take care of smaller
vehicle movement.
4. Ideally, between 2 recharge well edges, there should be a distance
of 1.5 times the depth of the well. (E.g. for a 20 feet deep well, gap of
30 feet should be maintained)
5. In-drain filters and check dam can be constructed before the water
enters the recharge well. Else the recharge well can get silted up
quickly.
5 6 7 8
The soil is excavated
to the required depth
Concrete rings are lowered in
one by one into the well
Aggregate or jelly
stones line the gaps
between the rings
This reinforces the
well structure
Howtodig a rechargewell howmanyrechargewells
Maintenance
Recharge wells need to be desilted once in 3- 5 years.
Howmuchdoes a Rechargewellcost
Well of 3 feet dia and 20 feet
dia can cost around Rs.
35,000/- to Rs. 50,000/-
(as of march 2021)
The cost increase as the diame-
ter and the depth
of the well increases.
Recharge Well
3 Feet
20 Feet
• 2,50,000 litres of surface runoff is generated from the road and
paved areas of a 10 acres layout
• 42 recharge wells of 3 feet dia and 20 feet depth are required to
recharge the runoff from the road and paved areas of a 10 acres
layout
• Each recharge well can hold around 4,000 liters of water
Breakupof Area
Sample layoutof10 acres
Different areasinlayout Area size Percentageof area
Plots area
Club house area
Park area
Roads and Paved area
Total area
22,034 sqm
2,003 sqm
4,006 sqm
12,018 sqm
40,063 sqm
55%
5%
10%
30%
100%
Park Area
Roads and Paved Area
Club House
Plot Area