RAIN WATER HARVESTING BY BANA

1. Urban Rain water Harvesting
By
Bana Consulting Pvt Ltd, Pune.
208, Amar Neptune,1/1/6 Baner Pune 411045
Email: banaconsulting@gmail.com
9970092866
Business Associate of
Furaat Earth Pvt Ltd

2. Rain Water harvesting is the deliberate collection and storage of
rainwater that runs off on natural or manmade catchment areas.
Catchment include rooftops, compounds, rocky surface or hill
slopes or artificially prepared impervious/ semi-pervious land
surface. The amount of water harvested depends on the
frequency and intensity of rainfall, catchment characteristics,
water demands and how much runoff occurs and how quickly or
how easy it is for the water to infiltrate through the subsoil and
percolate down to recharge the aquifers. Moreover, in urban
areas, adequate space for surface storage is not available,not
deep enough to accommodate additional rainwater to recharge
the aquifers, rooftop and runoff rainwater harvesting is ideal
solution to solve the water supply problems.
Rainwater Harvesting

3. This how water gets recharged in to the earth

4. Why Rainwater Harvesting?
 Conserve and supplement existing water resources
 Available for capture and storage in most global locations
 Potentially provide improved quality of water
 Supply water at one of the lowest costs possible for a supplemental
supply source.
 Capturing and directing storm water (run-off) and beneficially use it
 Commitment as a corporate citizen - showcasing environmental
concerns
 Public Mandate (India)
 Replenishing local ground water aquifers.
 To maintain green cover in the city (Urban area).

5. Why Not RWH?
 Not applicable in all climate conditions over the world
 Performance seriously affected by climate fluctuations that
sometimes are hard to predict
 Increasingly sophisticated RWH systems (ASR) necessarily
increases complexities in cost, design, operation,
maintenance, size and regulatory permitting
 Collected rainwater can be degraded with the inclusion of
storm water runoff
 Collected water quality might be affected by external factors
 Collection systems require monitoring and continuous
maintenance and improvement to maintain desired water
quality characteristics for water end-use
 Certain areas will have high initial capital cost

6. Urban rainwater harvesting
Urban centres in India are facing an ironical situation today. On
one hand there is the acute water scarcity and on the other, the
streets are often flooded during the monsoons. This has led to
serious problems with quality and quantity of groundwater.
This is despite the fact that all these cities receive good rainfall.
However, this rainfall occurs during short spells of high intensity.
(Most of the rain falls in just 100 hours out of 8,760 hours in a
year). Because of such short duration of heavy rain, most of the
rain falling on the surface tends to flow away rapidly leaving very
little for recharge of groundwater. Most of the traditional water
harvesting systems in cities have been neglected and fallen into
disuse, worsening the urban water scenario. One of the solutions
to the urban water crisis is rainwater harvesting - capturing the
runoff.

7. Why RWH in urban area?
 In areas where there is
inadequate groundwater
supply or surface resources are
either lacking or insufficient,
rainwater harvesting offers an
ideal solution.
 Helps in utilising the primary
source of water and prevent
the runoff from going into
sewer or storm drains, thereby
reducing the load on
treatment plants.
 Reduces urban flooding.
 Recharging water into the
aquifers help in improving the
quality of existing
groundwater through dilution.

8. Water harvesting potential (L) = Area (m2) X Rainfall (mm) X Runoff coefficient
COLLECTION AREA AND EFFICIENCY
AREA RUN OFF
COEFFICIENT
Roof Top 0.85 to 0.95
Paved Area 0.50 to 0.75
Bare Ground 0.10 to 0.20
Green Area 0.05 to 0.10
Rain water collection
1000 mtr2 area x 100 mm rain fall x 0.75
= 75000 ltrs of fresh water

9. Average rain fall record in India
Rain Fall

10. Quality Issues in rain water harvesting
Catchment
area
Pollution Control
Roof Top Bird dropping, Phenolic materials
leaching from the roofing
Keep the roof clean, flush off
first rains, Don’t use tar based
coatings on the roof.
Paved area Dust, mud, oil residuals, organic
waste (leaves debris),tar etc.
Keep paved area clean. Keep
oil or chemicals storage away
from the runoff area.
Bare Ground Mud, sand particles, oil organic
waste,
Control soil erosion by
hardening the surface. Keep
the surface free from plastic or
organic waste.
Green Cover Dust, Organic waste (grass leaves
debris), soil particles, chemicals
etc.
Remove the grass and leaves
waste from the green area.
Don’t use pesticides or
fertilizers.

11. Right way of Rain water recharging
👎 It was noticed that in normal course it take 20 years to percolate
water 100 feet
👍 With proper rain water recharge system water can percolate within
few weeks.

12. EFFECTIVE WAYS TO HARVEST RAIN WATER

14. Cross section of the System
Gravel
filtration
Graded
sand
filtration
CG
screen
filtration
Filtered
water
outlet
Rain
water
inlet

15. Conventional Well
Vs
Furaat Modular System

16. Visuals of Conventional & Furaat Modular System

17. Conventional System Vs Furaat Modular System
Conventional Well
• Considering the projects in urban
areas, size 4x4x4 rectangular or
round size occupies more area
and becomes expensive.
• In the season of monsoon, muck
is seen settled on filter head,
hence system gets choked.
• There is no back wash system
Furaat Modular System
• FMS is scientific and compact.
Systems rise vertically with
maximum diameter of 1.5
meters.
• Furaat has specially designed
primary module for controlling
the muck.
• Furaat system can be back wash
easily by domestic workers.

18. Conventional System Vs Furaat Modular System
Conventional Well
• Maintenance is expensive and
time consuming as it requires a
civil team.
• Unsafe in underground
operations and therefore needs
special preparation to enter
inside the system.
• Unhygienic conditions due to
ponding in filter pit.
Furaat Modular System
• Maintenance is easy and can be
done by 2 domestic or non-skilled
labors with the help of Furaat
service manual with a cleaning
time of 2 hours.
• Human safety is the prime
concern, therefore FMS is
designed with integral ladder in
the system.
• Furaat system have closed lids,
therefore protects contamination
in harvesting.

19. Conventional System Vs Furaat Modular System
Conventional Well
• Construction time and brick
masonry takes 20 to 30 days.
• Recharge wells with 6% to 8%
open area with metal slotted
casing pipe reduces percolation
due to corrosion.
• No control on corrosion affects
durability of recharge structure
Furaat Modular System
• FMS are installed in 3 hours by
readymade precast modular slabs
with the help of 3 non skilled
persons.
• Furaat installs efficient well with
low carbon galvanised screen
with 48% open area.
• Furaat provides on-site 2000 PSI
marine coating on casing pipes
for durability

20. Conventional System Vs Furaat Modular System
Conventional Well
• No scientific measurement of re-
charge.
• As the structure is non-
functioning, it becomes a national
waste.
• It is costly and stationery.
Furaat Modular System
• Furaat systems are scientifically
tested @ 30,000 litre per hour.
• Efficient functioning of FMS aims
to make India water positive.
• Furaat system are cost effective,
can be shifted to other site.

21. Installations

22. Installations

23. Installations

25. Bana Consulting Pvt Ltd
9970092866

26. Dr. Balajith B. Shetty
Bana Consulting Pvt Ltd.
208, Amar Neptune, 1/1/6 Baner,
Pune 411045.
91 9970092866
91 20 27290117
banaconsulting@gmail.com
Business associate of Furaat