| Water Source | Potential Yield * (MLD) | Distance from | Applications For Water Resource |
| 1. | | | |
| 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 | Applications For Water Resource |
| 2. | | | |
| T.G.Halli (average) | 100 | 25 | Municipal supply |
| Hessaraghatta | 4 | 17 | (potable quality) |
| | Total 104 | | |
| | | | |
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 | 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 | 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 | 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 | - | - |
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:
Interesting Saar...this info is worth more than a blog..shared doc (which tracks changes) might be good! anyway..keep it going. Best,
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.
It is really a good source of information about different water resources, uses pattern and establishment patterns. Thanks to the blogger and the author.
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