Khulna Water Supply Project (KWSP)

Project Location: The KWSP proposes a surface water system sourced from the Mollarhat intake point on the bank of Modhumati River in Bagherhat District approximately 33 km from the Khulna City. The raw water from the Modhumati River will be stored into an impounding reservoir (IPR) and then transmitted to a surface water treatment plant (SWTP) at Village: Samonto Sena with the purified water to be distributed through a system of 5 reservoirs and 10 overhead tanks (OHTs) and delivered to consumers in the Khulna City Corporation (KCC). Another source of water is ground water from the DTWs of the KCC. The project is located in Bagerhat (UZ: Mollarhat & Fakirhat) & Khulna (UZ:  Rupsha & KCC). 

Project Components: Physical infrastructure to be developed and financed by the Project includes the following:

(i) JICA Components:

•     Water Intake Facility (capacity 110MLD): total area A=2.5acres
•     33 km long Raw Water Transmission Mains (RWTM);
•     Impounding Reservoir (capacity 775,200m3); and 
• SWTP (110 MLD): total area of IPR & SWTP, A= 64 acres.

(ii) ADB Components:

•     Clear Water Transmission Main - 25 km pipeline including a Rupsha River crossing;
• Distribution Pipe Network –  281 km primary and secondary mains, 275 km service connection mains; replacement of 227 km of existing distribution pipe (no replacement is now planned and will be all new pipework);
• Ground Reservoirs and Overhead Tanks – 5 Reservoirs (now revised to 7), 11 overhead tanks (OHTs) (now revised to 10), and 5 pump stations (now revised to 7);
• Installation of pumps, electric transformer, and diesel electric generating units;
• KWASA offices – design of ten story headquarters building with initial construction to six storeys and three two story zonal offices;
• Deep Well Rehabilitation Program; and
• Metering and service connections – 65,000 (approximately).

1.    Water Intake Facility: The water intake site was selected at Mollarhat located 0.10 km downstream from the Mollarhat Bridge. A total of 2.52 acres of private agricultural land is required. All land acquisition and resettlement issues are addressed in the Project’s Resettlement Plan. 

2.    Route of Raw Water Transmission Pipe: The routes of raw water transmission pipes are proposed to be installed in the Gopalganj-Khulna Road and Bahirdia-Baghmara Road. This pipe is for construction under the existing roads. The Ductile cast iron pipes (DIP) will be used for raw water transmission, considering durability, pipe joint work, soft soil conditions, and cost. The diameter of the proposed raw water transmission pipes is 1,350 millimeters (mm).

3.    Impounding Reservoir: The location of proposed impounding reservoir is at Samanto Sena near Bahirdia-Baghmara Road. A total of 67.73 acres of land is required for the combined impounding reservoir and SWTP. Design Condition for Impounding Reservoir is below: 

•     Effective Water Depth- 12.0 meters
•     Required Land Area- 67.73 acres 
•     Area of Impounding Reservoir- 24.7 acres
•     A single pipe of 1,100 mm diameter and of about 100 m long will be installed for the project flow (110,000 m3/d) from the impounding reservoir to the SWTP. 

4.    Surface Water Treatment Plant (SWTP): The proposed SWTP is at Samanto Sena. The Ground level of the SWTP is set at +4.10 m PWD considering the road level (+4.059 mPWD) near the SWTP and the highest flood level (+3.360 mPWD) based on past records. The layout plan (Fig. 8) considers a future expansion plan for the sludge drying bed. Since the administration building and power receiving facility are near the entrance gate, the sludge drying bed is located near most of the SWTP site, and the clear water reservoir will be constructed near the clear water transmission pipe route considering water flow.Clear Water Transmission Facility: The clear water transmission pipeline will be 24.6km. The “pipe jacking method” has been selected as river crossing method taking into account environmental impact, simplified temporary work, and construction cost. The clear water transmission facility will send clear water from SWTP to the distribution reservoir. 

5.    Water Distribution System: The water distribution system includes storage, transmission, distribution, and supply for clear water. It consists of distribution reservoir, overhead tank, distribution pipe network, pumps, valve, and other equipment. 

6.    Distribution Reservoirs and Overhead Tanks: water level of the distribution reservoir and overhead tanks, which are utilized for the water distribution system.

7.    Water Distribution Zones: The adjoining zones are connected to ensure the water distribution network can supply a certain volume of water in an emergency.

8.    Khulna Water Supply and Sewerage Authority (KWASA) office buildings: There will be a 15000 sq feet office building for KWASA with a zonal office. 

Share this page via