Overview of revised design and estimate of Kamarpara RPWSS under Bangladesh Rural Water Supply & Sanitation Project.

Kamarpara Rural Piped Water Supply Scheme, Jhikargacha Upazila, Jessore district was proposed to consist of three villages namely Kamarpara, Fatepur and Jafarnagar village under feasibility study (BETs) . But considering technical and financial point of view as per report submitted by the team (PMU team including technical consultant of WB visited the site), Kamarpara (288 HHs) village has not been considered for implementation of the scheme and decision has been taken to implement the proposed scheme in the two villages (Fatepur -366 HHs) and Jafarnagar- 466 HHs) instead of three villages.

Total households in Fatepur and Jafarnagar village are 832. But during preparation of road net work map for designing the distribution pipe line for the scheme, only 641 number households are found technically feasible to connect under this distribution net work. Remaining 191 number households are located in scattered area and far away (some cases there are no road to reach) from the distribution net work.  So, these 641 number households are considered as potential for the scheme. But as per previous experience and field visit report, it is revealed that maximum 70% of these existing households would take the house connection from the scheme in the first year of operation. So, 450 numbers (70%) house connection are included in the estimate of the scheme. Remaining connections would be done gradually in the following years of operation of the scheme. But, for design purpose projected population based on the existing 641 households are considered.

Calculation of water demand

Present HHs = 641 nos.  Population per HH (assume) = 5 nos.  Present populations = 3205 nos.

Considering population growth rate of 1.4% and 20 years project period, projected populations = 4232 nos. (Equivalent to 846 HHs)

Present water demand per day = 3205x65x1.15=239573.75 liters (Assume LPCD=65 liters, L&W=15%)

Projected (20years) water demand per day = 4232x65x1.15=316342.00 liters

Supply Hours

Considering availability of electricity, intermittent water supply in the scheme would be feasible. Total supply of water is considered 8 hours in a day (3+3+2).

Design of Over Head Tank

Capacity of the Over Head Tank has been considered 1/3 of the projected water demand in a day which would be very much adequate for the scheme.

Soil investigation report provided by the consultant has been followed during designing of the foundation of OHT. But, for technical reliability and soundness of the structure another soil investigation has been kept in the estimate of OHT. Before construction, soil investigation of the selected site would be carried out and based on the soil report foundation of OHT will be re-designed if required.

 

Production Well design

As per bore log and design provided by the consultant, production well has been designed. But, installation of another test tube well (TTW) has been kept in the estimate of the scheme to explore and know the actual sub surface formation of the site. Based on the report of TTW, final design of production well including pump will be done and accordingly will be installed.

Distribution Pipeline Network

Distribution pipe line network has been designed considering the projected water demand of the scheme.

Other components such as pump house, boundary wall, power supply, land development etc. have been designed as per requirement of the scheme.

The cost (capital) for different components of the scheme is shown in the following table.

SL #	Description of items		Quantity	Unit	Cost in Taka
1	38 mm dia. Test Tube Well (300 meter depth)		1	No.	60,490.00
2	200mmx150mm Production Well		2	No.	25,11,980.00
2	Submersible Pump		2	No.	10,78,364.00
3	Pump House including Office		1	No.	7,80,000.00
4	Over Head Tank (Capacity = 100 m3 )		1	No.	26,41,170.00
5	uPVC Distribution Pipe Line including all relevant fittings	150 mm dia.(B class)	62	meter	37,42,682.00
		100 mm dia. (B class)	1897	meter
		75 mm dia.  (C class)	5409	meter
6	House Connection		450	No.	18,00,000.00
7	Water Meter (wall mounted vertical type) including meter box chamber		450	No.	22,50,000.00
8	Boundary Wall including one MS Gate of        4 ft x7 ft size (Double leaf)		60	meter	2,41,100.00
9	Electric Connection (Electric poll, 3 phase transformer, energy meter, demand charge circuit breaker etc.)		1	item	5,40,000.00
10	Land Development		1	item	10,00,000.00
	Total capital cost=				1,66,55,686.00
11	Social Development Officer for 18 months		15000.00/month		2,70,000.00
12	Formation of Community Based Organization		LS		30,000.00
	Grand total=				1,69,55,686.00

Monthly Operation and Maintenance cost (O&M)

Following minimum cost (monthly) are considered to operate and maintain the scheme at sustainable manner.

SL#	Area of O&M cost	Unit	Nos.	Cost / month (TK.)	Amount in Tk.
1	Scheme Manager cum Accountant	Person	1	6,000.00	6,000.00
2	Pipeline mechanic cum bill collector	Person	1	5,000.00	5,000.00
3	Pump operator cum plumber	Person	1	5,000.00	5,000.00
4	Peon / MLSS	Person	1	3,000.00	3,000.00
5	Electricity bill	LS		20,000.00	20,000.00
6	Repair & maintenance including material and labour	LS		2,000.00	2,000.00
7	Testing of water quality	LS		1500.00	1500.00
8	Transportation	LS		1000.00	1000.00
9	Stationeries	LS		1000.00	1000.00
10	Depreciation	LS		4,000.00	4,000.00
	Total cost per month =				48,500.00

Projection of House Connection

Through out 20 years of project period total number of house connections would be 841 nos. The scheme will be operating with 450 house connection from the first year of operation. It is assumed that within 10 years of operation 100% house holds would be connected under the pipe line distribution network of the scheme.  Tentative projection of house connection during the project period is shown below.  

	Year of Operation
	1	2	3	4	5	6	7	8	9	10
House Connection	450	500	550	600	650	700	750	800	841

Assessment of Community Contribution and Tariff Structure

A sample survey regarding willingness to pay has been conducted by PMU team. Pattern of community contribution as well as tariff has been analyzed and stated in the report which is attached herewith for ready reference.