Thursday, March 29, 2007

Summary of Water Resources for Bangalore from AUSAID Report, 2001

Water Source

Potential Yield * (MLD)

Distance from Bangalore (km)

Applications For Water Resource

1. Cauvery River

Stages I, II and III (existing)

540

Source Options:

Municipal supply

Stage IV Phase I (under construction)

270

99 (Shiva Anicut)

(potable quality)

Stage IV Phase II Part 1

258

126 (KRS Dam)

Stage IV Phase II Part 2

257

175 (Hemavathi)

Stage V

686

205

Total 2011

(Netra/Hemavathi)

1. Allocation for Stage V is subject to CWDT ruling.

2. Seasonal storage capacity must be developed for BWSSB use.

3. Interim arrangements for flow regulation prior to storage are needed.

4. Most economic source development is from Shiva Anicut and KRS Dam.

5. Complete reliance on this resource exposes BWSSB in event of conflict.

6. Bulk of Cauvery resource proposed for irrigation (398 out of 465 TMC).

Water Source

Potential Yield * (MLD)

Distance from Bangalore (km)

Applications For Water Resource

2. Arkavathi River

T.G.Halli (average)

100

25

Municipal supply

Hessaraghatta

4

17

(potable quality)

Total 104

1. Sources are strategically located close to Bangalore.
2. Declining yield is a major co ncern for T.G.Halli and Hessaraghatta. Potential
for Hessaraghatta was 36 MLD and is estimated to be 4 MLD under present
catchment conditions.
3. Catchment management measures are needed to control yield reductions.
4. Large area of tanks leads to decreased runoff and increased evaporation.
5. Water quality problems may arise due to development within catchments.

Water Source

Potential Yield * (MLD)

Distance from Bangalore (km)

Applications For Water Resource

3. Groundwater

190

Within City limits

Municipal supply

(potable quality)


1. No current legislative regulation on access to, or use of, groundwater.
2. Current usage exceeds sustainable yield in the BMA (falling GW levels).
3. Estimate of sustainable yield for BMA is 480 MLD (>50% to irrigation).
4. Artificial recharge could be used to improve situation.
5. High nitrate levels are a common problem (and increasing).
6. Improved monitoring (water level, quality) is essential to manage resource.

Water Source

Potential Yield * (MLD)

Distance from Bangalore (km)

Applications For Water Resource

4. Rainwater Harvesting

20-50

Within City limits

Small scale supply

(commercial,

households)


1. Large seasonal variations in rainfall necessitate storages and supplementary
supply.
2. Some potential where no piped WS available.
4. Potential yield (20 -50 MLD) is a broad estimate only, subject to costs.
5. General intended use is for washing water and non-potable uses.

Water Source

Potential Yield * (MLD)

Distance from Bangalore (km)

Applications For Water Resource

5. Treated Effluent Re -use

170 -220

Within City limits

Non-potable supply

(from BWSSB

(industrial/non -

STP’s)

domestic)

TOTALS

2730

-

-

1. Primary purpose is to reduce demand on freshwater sources.
2. Extent of usage wi ll depend on regulations, pricing and level of service.
3. Distribution likely to be viable within a limited radius (3 km) of STP’s.
4. For non -potable applications only.
5. Groundwater recharge (via tanks) is an option for effluent re-use.

3 comments:

Sastry said...

Interesting Saar...this info is worth more than a blog..shared doc (which tracks changes) might be good! anyway..keep it going. Best,

sas said...

It is interesting to know from the table that BWSSB plays and will play a major role in getting water to city contrary to what in the last NIAS meeting where speakers were talking that most people get water from private sources and role of BWSSB has to be looked into. It was as if BWSSB itself was not needed.

Also it's interesting to note >50% of GW goes to irrigation.

veerender kumar said...

It is really a good source of information about different water resources, uses pattern and establishment patterns. Thanks to the blogger and the author.