For proper implementation and management purpose, the area of Greater Mumbai limit is divided into seven sewerage zones.
* Colaba
* Worli
* Bandra
* Versova
* Malad
* Bhandup
* Ghatkopar
Zone 1 – Colaba covers an area of 574 ha. Contains six pumping stations and about 32 km of sewers leading to preliminary treatment and the short pipe outfall to Colaba Harbor.
Zone 2 – Worli covers and area of 3891 ha. Contains sixteen pumping stations and about 339 km of sewers leading to preliminary treatment and the new, three-kilometer long sea outfall at Worli, discharging to the Arabian Sea.
Zone 3 – Bandra covers an area of about 7730 ha. have sixteen pumping stations and about 326 km of sewers. Flow from the IPS will pass to Bandra preliminary treatment works prior to discharge via the EPS and a 3.5 kilometer long sea outfall to the Arabian Sea.
Zone 4 – Versova covers an area of about 2140 ha. There are only two stations, a final pumping station one small pumping station at Versova village. The 146 km. of sewers lead to preliminary and three stage aerated lagoon treatment discharging to Malad Creek.
Zone 5 – Malad covers an area of over 11500 ha. There are six pumping stations and about 300 km. of sewers. A final pumping station delivers flows from the interceptor to preliminary treatment, which discharges to Malad Creek.
Zone 6 – Bhandup covers an area of 4274 ha. There are three pumping stations and about 105 km of sewer leading to preliminary and single stage aerated lagoon treatment discharging to Thane Creek.
Zone 7 – Ghatkopar serves an area of about 7730 ha. There are 3 pumping stations and 136 km of sewers leading to preliminary and single stage aerated lagoons treatments discharging Thane Creek.
Though sewerage lines are laid in above zones, due to rapid expansion, development, dense population and non- accessibility etc sullage in some of the parts particularly in extended suburbs and slums is connected to storm channels , which is required to be segregated.
Sewage collection system comprising of gravity underground sewer network and online satellite pumping stations are grouped in such way that the entire quantity of sewage collected from that zone is delivered to the terminal point located in that respective zone.
All such terminal points of seven zones are provided with appropriate Treatment Facilities and main disposal pumping stations of adequate capacity for final disposal.
Statistical data of Sewerage network.
1. Area of the city 437 Sq.Km 2. Population of the city 1,20,00,000 3. Sewered area of the city 60%
4. Unsewered area 40%
5. % of population living in slum
60%
6. % of population served with sewerage facility
40%
Sewerage System Statistical data
1. Length of Sewer Lines 1400 Kms.
2. No. of Sewage Pumping Station 51 Nos.
3. No. of Waste Water Treatment Facilities
7 Nos.
4. No. of Outfall 3 Nos.
5. No. of Lagoons 3 Nos.
6. No. of Street Connections 2,65,000
7. No. of Manholes 53,000
8. Size of Smallest Sewers 6” dia.
9. Size of Maximum Sewers 6’ dia. Circular & 6’ X 9’
ovoid shape
10. Total sewage handled 1700 mld
Treatment Facilities
Zone
Average Dry Weather Flow (Million Liters per Day)
Treatment Facility
Colaba 41.10 Aerated Grit Chamber and Marine Outfall.
Worli 756.90 - do -
Bandra 796.80 - do -
Versova 180.00 Aerated Grit Chamber and Lagoons
Malad 280.40 To be decided in Phase – II
Ghatkopar 386.10 Aerated Grit Chamber and Lagoons Bhandup 230.00 Aerated Grit Chamber and Lagoons 5.19 Future scenario
The Consultant appointed under M.S.D.P. - I have carried out the feasibility studies and have prepared the master plan for sewerage system for the population growth by the year 2025. M.C.G.M. has accepted the report. The total cost of the project is Rs.55704 Millions and is proposed to be implemented in V stages. These works are critical and sensitive from environmental and health point of view. The works identified under phases I and II are most critical and are required to be attended on priority. M.C.G.M. has approached G.O.M. / G.O.I. / World Bank for financial assistance to implement Phase – I and II of the project. The phase- I and II is also proposed for the finance and under Urban Renewal Mission of Govt. of India.
The total cost of the project is Rs.55, 704 millions, out of that Sewerage works amounts to Rs.39, 451.5 millions and Slum Sanitation Project Works amounting to Rs.16, 252.3 million. These works are required to be carried out in V phases from 2005 to 2025. However, these works are not started so far.
Major components of M.S.D.P. - II are construction of Marine Outfall for Malad Zone, rehabilitation / upsizing of sewer lines, upgradation of pumping stations, provision of treatment plants, outfall, construction of new sewers and slums sanitation projects.
Brief details of the projects are as below:
5.19.1 Main components of MSDP Stage – II and its cost. (Cost in Rs. Millions)
Components Quantity Cost
Slum sanitation 3241ha 16252
New Trunk Sewers 58 km 600
Upsized Trunk Sewers 106 km 3824 Sewer Rehabilitation 363 km 11674
Illegal Connections 73
Area Sewers 3628 ha 4764
Pumping Stations 51 No 5476
Transfer Schemes 4 No 2465
Treatment Works 9 No 8153
Outfall 1 No 2423
Total 55704
5.19.2 Phasing of M.S.D.P. - II (Cost in Rs. Millions)
Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 Total 2002-05 2006-10 2011-15 2016-20 2021-25
Slum sanitation 18.6 4058.5 4058.5 4058.5 4058.5 16252.5 Upsizing of sewers 564.0 1436.7 1144.1 668.9 9.8 3823.6
New sewers 98.8 97.0 150.2 101.3 152.9 600.2
Rehab of sewers
Survey 252.9 286.4 0.0 0.0 0.0 539.3
Sewers 0.0 1798.2 3100.4 3100.4 3100.4 11099.3
Manholes 17.6 17.6 0.0 0.0 0.0 35.3
Area sewers 1664.1 760.7 591.2 1147.3 600.5 4763.9 Pumping stations 487.2 740.8 1493.5 661.3 1532.4 4915.3 Pumping Mains 160.5 114.5 243.4 16.7 25.4 560.5 Illegal connections 22.2 36.6 14.4 0.0 0.0 73.1
Outfall 121.2 2302.2 0.0 0.0 0.0 2423.3
Transfer 0.0 152.2 0.0 1307.7 1005.3 2465.2
WWTW 0.0 311.4 5741.7 144.3 1955.1 8152.5
TOTAL 3407.1 12112.7 16537.4 11206.5 12440.4 55704.0 5.19.3 M.S.D.P. Stage –II Priority Works
The works identified under Phase- I and II are priority works. The cost of this work is Rs.23, 760 millions, out of that Rs.18, 960.00 millions is for sewerage and Rs.4, 800 millions is for S.S.P. These works are to be carried out by the year 2010.
Major sewerage works proposed are in Malad and Versova Zones.
Major components of priority works are as below:
Proposed Works Quantum Cost Rupees.
In Million
New sewers 25 km. 195.8
Upsizing sewers 60 km. 2000.7 Sewer rehabilitation 75 km. 2372.7
Area sewers 1344 Ha. 2424.8
Pumping Station 17 Nos. 2122.3
Outfall 3.4 km. 2423.4
Treatment works 374.6
Others 519.5
Contingencies 6530.00
S.S.P. 4800.00
Total 23760.00
On execution of the priority works, disposal facility will be provided in each zone. Extra capacity will be provided in collection, conveyance, pumping and treatment. Hygienic sanitation facilities will be provided to the slum dwellers. Due to this, there will be less foul flow, less health hazards and beaches will be cleaned.
This will also result into extra breeding of fishes in the sea, good quality of the sea-shore and good health to citizens of Mumbai.
Slum population and sewerage facilities in slums
More than half of City’s Population live in SLUMS
There are 6.9 Million Slum dwellers in Mumbai.
SLUMS are un-planned and under served
Located in HIGH RISK and BARELY HABITABLE areas of city
Poorly equipped with Sanitation and Solid Waste collection facilities Sanitation in slums
Current sanitation scenario is as below:
Inadequate Public Toilets Infrastructure
Public Toilets over-burdened, long queues
Lack of Water, Electricity and Illumination
General Discomfort among Slum Dwellers
Forced to use open public places
Not connected to sewers
Near absence of sewerage system
Sullage connected to storm channels
Shorter life spans of Toilet Blocks
MCGM bearing all O & M Costs.
Health hazards and environmental degradation for the whole city M.C.G.M.’s Action
•
To Improve sanitation in Slums MCGM had taken up Slum Sanitation program as an integral part of MSDP-I/ MSDP- IISanitation facility explicitly for poorer segment
Based on the principles of community Driven demand
Treats slum dwellers as initiators, collaborators & resources to build on
Demand-driven and participatory approach
Sustainable investments by community members
Survey of sanitation facilities in slums of Mumbai.