Rain Water Harvesting in Bangalore - A Report

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Written By Rithesh - 21 April, 2010

Bangalore BWSSB Water water supply RWH Borewells

Growth in the no. of buildings with RWH facilities over the last one year. 

 

 

Apr-09

May-09

Jun-09

Jul-09

Aug-09

No. of new installations

111

128

138

105

1145

MoM growth in the no. of new instalations

 

17

10

-33

1040

 

Sep-09

Oct-09

Nov-09

Dec-09

Jan-10

Feb-10

847

328

296

845

1462

1596

-298

-519

-32

549

617

134

 

 

A Comparison of number of buildings with BWSSB connection, bore wells and RWH facilities:

Zone

No of Borewells

No of Connections

% of buikdings with borewells

No of building with RWH

% of buildings with RWH

East

9346

81583

11.46

968

1.19

South

32593

124065

26.27

3407

2.75

South East

12555

67338

18.64

1340

1.99

Central

7206

49429

14.58

438

0.89

North

16126

89476

18.02

1610

1.80

West

27675

148156

18.68

2658

1.79

Grand Total

105501

560047

18.84

10421

1.86

 

 

 

Summary:

  1. Approximately 920 additional buildings are implementing RWH every month over the last year. Over the last three months the rate has increased to 1300 buildings per month.
  2. As of Feb around 10000 buildings had implemented RWH.
  3. At a rate of 1300 houses per month, it would take 35 years for all buildings with BWSSB connection to implement RWH.
  4. Roughly around 1.8% of buildings with BWSSB connection have implemented RWH.
  5. 1 in 5 buildings has a bore well, 1 in 55 buildings has RWH facilities.
  6. The rate of RWH installation might increase over the coming months with the govt making it compulsory.

 

Suggestions:

  1. Parks and open grounds are ideal for rain water harvesting.
  2. RWH at place like Cubbon Park and Lalbhag should be taken up as pilot projects.
  3. Corporators should take up RWH projects in local parks (we should move away from lawn/garden concept to mini forests).
  4. Thanks to ingenious brains for engineers at BBMP most storm water drains have now been concretized, leaving no scope for water to seep into the ground. Can these drains be re-modeled to have RWH pits at every few meters?
  5. It should be made mandatory for flyovers and underpasses to have RWH features.

 

Please see the attached documents provided by zenrainman for exact zone wise distribution. Thank you zenrainman for  sourcing and sharing the data. The data in excel sheet has not been fully verified (OCR of the pdf doc).

   

 

COMMENTS


@Ramesh

Rithesh - 27 April, 2010 - 08:24

I think zenrainman is the person who should respond to your question about the potability of harvested rainwater (last time i checked he was travelling). From the limited knowledge i have, one of the ways to preserve the water would be to add chlorine. Chlorine will take care of most of the biological issues.

My objection is  to the illegal, unauthorized,illogical  methods BWSSB is using for enforcement.

I have already implemented the RWH in principle- I donot want to pay the BWSSB engineer and his authorized contractor for a certificate. When things run on the basis of such certificates I am sure you know as well as I do that the RWH compliance will be only on paper.

Why not make it every house holder? why not club 2 site owners of smaller size? After all they also get rain water and infact it would encourage  the smaller houses to have atleast  a 3x3  open earth! everything is built up and concreted.

Why should not the meter reader who comes everymonth be permitted to certify compliance? Why burden the consumer?

Why have not rules been brought out for controlling the indiscriminate sinking of borewells which is one of the major causes for depletion of the water table after 25 years of the problem coming to their notice?

Are you one of the householders required to shell out for RWH or 30 percent educated, or 5 percent tax payer,  or  well off'  you  would  have many objections to  carry  all the ills  and ails of the other seventy percent.

They dont have to pay taxes, utilities, power, but get to live in an upscale address.  All the "benefits"  of "city" life they get is from your(?) and my hard earned money.  That goes to subsidize food, schooling and anything else government provides them in their name from your money.

After sixty years of giving "free" rides to the "unfortunates" slum dwellers and uneducated,

I object to hauling  the donkey cart, so they can have cell phones, radios cable TVs two wheelers, alcohol etc on your and my hard earned money.

Why should not the meter reader who comes everymonth be permitted to certify compliance? Why burden the consumer?

 Instead of creating awareness and cooperation. No one will have problems with prospective rules. But to selectively apply the rule to some 60000  old households arbitrarily, retrospectively is undemocratic and illegal. I dont know whether you have a porperty for which you have to make these alterations to "suit" BWSSB officials and the "authorized" contractors.
Have you any idea how much of BWSSBs revenue is drained by the illegal connections?

BWSSB should plug all the loop holes. How much can 60,000 houses save. Seeking voluntary compliance is always a better democratic way and supposed norm in a SIXTY years independent India.

They just sell their votes for a saree,drink, 500 rupees etc and tilt your democracy in their favor each and every time. Democracy becomes the mockery that you can see in every state every day.

Now a days you cannot get any of the villagers to do a day's honest work even by paying because under the Rozgar yojanas each household gets one job, which they get paid doing nothing.
That is why labor contractors are bringing employees from Bihar orissa west bengal etc.

All I want is democracy to be fair to one and all, not be based on the economic/educational status or the burden of the mass be borne by the educated or well off sixty years after independence.

RWH - plainly the way out

murali772 - 26 April, 2010 - 14:29

Including Cauvery 4th stage, BWWSB will be pumping close to 1000 MLD (million litres per day) into Bangalore. With an annual average rainfall of 970 mm, if we can harvest the entire rain falling over the 800 sqKm forming the extended BBMP, it will give us 776,000 ML in a year, or 2130 MLD.

If we can harvest a 50%, we would be getting more than the equivalent of the present pumping, and all for free.

Very clearly, increased RWH is the answer.

 

RWH issues.

rs - 23 April, 2010 - 08:34

Hi

I am a little sceptical about this RWH stuff. I've been planning to get RWH done but when I talk to people there are various aspects of the whole thing which are bothersome. For one, it seems like most people are just simply buiding a hole in the ground and allowing the water to go in there - to recharge groundwater. Apparently, according to one of the companies I dealt with - Farmland Rainwater - it seems like this is not good as the soil in Bangalore is not permeable enough - too clayey and so the water simply stagnates and that could lead to other problems - mosquitos etc. A solution to this is to connect the RWH to a borewell but then not everyone has borewells.

The other possibility is to connect the RWH to the sump system directly using a filter. The problem with this is whether the water is clean enough. At least in my place the trees could cause a problem as leaves are constantly falling on the roof so the roof has to be cleaned very regularly. Added to this the occasional monkey doing its job etc. The RWH company guy says that the filtre is good enough to make the water potable but one always has ones fears.

Finally, I think one problem with RWH is that the city water is too cheap. Even with a 200% increase the cost is negligible compared to other things - like cable TV or internet or electricity. So there is little incentive for some one to install RWH as even with the best estimates it takes about 20 years to recover the cost.

At the end of the day, there seems to be Rain Water Harvesting of different flavours. I fear that what the BWSSB has mandated will have no real effect as most people will do the `nam ke vaste' thing and this, while satisfying the mandate, will not really help.

 

Ramesh

 

What is the contribution

idontspam - 13 May, 2010 - 11:22

What is the contribution these unfortunate's can make for the bludgeoning city and its water problems?

Unfortunates owning 60x40 sites in Bangalore? Hmm... I wonder what they will call the hutment dwellers. Gifted?

 


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