Rice is by far the most important crop and accounts for approximately 78 percent of the agricultural area. But the actual assignment arp.a of the project was far below the design value. To conduct field research on the technical issues related to the poor performance of the project;
Yunus (1977) found that about one-third of the Deep iubewells in the Chittagong Division did not work in the. Mean annual precipitation increases from 2032 rnm in the north to 2794 rnm in the south of the project area. The depth of water diverted during the study period (Wd) was estimated based on the discharge and operating hours of the low riser.
The initial stock of water in the stream (Vi) was calculated from the water level, cross-section and length of the streams. The amount of pumped water (Vp) into the stream was determined from the flow and operating time of the primary pumps. Stream irrigation efficiency of study primary pumps, Barisal Irrigation Project, Phase I, during the 1984-85 dry season.
As shown in the table, the annual loss of stream storage capacity ranged from 10 to 30 percent with an. An attempt was made to evaluate the performance of each of the participating agencies responsible for the operation and maintenance of the project. Digging streams during the irrigation season causes a delay in the commencement of irrigation.
The majority of the managers interviewed reported that the supply of irrigation water is not sufficient. Most of the managers answered that the low duration of primary pump was due to lack of Majority of the managers interviewed reported that BADC's services for distribution and maintenance of LLPs are satisfactory.
Summer; the pump outlet walls are raised up to the design level of the proposed embankment. A pipe outlet is proposed for each location of design capacity 1,1,1'• 'of the outlet pipe which is assumed to be 2 cusec. The benefit of the improvement work ':is determined by the cost of the LLP field and its operation and maintenance.
The benefit-cost ratio was obtained from the ratio of the present value of the accumulated benefits to the present value of the total cost of the improvements. Since the improvements mainly included the raising of the embankments, the pump house and the sluice gates, the economic lifetime of the renovation works can be considered to be 20 years. For this economic life, the cost-benefit ratio of the improvement ranged from 0.564 to 0.729.
In order to reduce water losses, it is necessary to ensure regular and adequate maintenance of streams and timely operation of dams. It was found that the annual loss of the storage capacity of streams is quite high. As reported by pump group managers, the maintenance services offered by BWDB were focused only on re-dredging streams.
But most of the managers believed that the interval for the re-excavation work should be reduced. Bos, M.G., "Standards for Irrigation Bfficiencies of ICID," Journal of the Irrigation and Drainage Division, ASCB, Vol. Dastane, N.G., "Effective Rainfall," Irrigation and Drainage Paper No.25, Food and Agricultural Organization of the United Nations, Rome, Italy, 1974.
Irrigation and Drainage Document No. 24, Food and Agriculture Organization of the United Nations, Rome, Italy, 1977. Jensen, rJ.E., "Evaluating Irrigation Efficiency;" Journal of the Irrigation and Drainage Division, ASeE, Vol.93, No. Engineering, BUET, Dhaka, Bangladesh, in 1981, in partial fulfillment of the requirements for the degree of Master of Science in Engineering.
Sattar, ~1.A., "Water Management Profile of the Thakurgaon Tubewell Project in Bangladesh," thesis presented at the University of the Philippines, Los Banos, Philippines in 1983, in partial fulfillment of the requirements for the degree of M.Sc. Evaluation of the Effectiveness of Integrated Management Approach in ~arisal Irrigation Project, Phase - 1.
1 BWDB!
J Yes
The primary pump is out of order .. iv) BADC feels that the field placement of LLP is not sufficient to justify more pumping.. i) Duration of P.P. operation is not sufficient ii) The stream is stained. iii) Excessive losses. iv).
I BRDB I
1st class masonry in cement mortar of preparation 1:4 in abutment, wing wall including cost of all materials and transportation there from 1000 ft - 0 inch. Supply of clear fresh water and if necessary cleaning the stones and immersing stones in clear water, hardening of masonry etc. 106 Construction cost for raising sluice gates (2 vents) under pumping unit No. KP9, BIP, Phase-I.
Supply of pure fresh water and cleaning of bricks when necessary and immersion of bricks in pure water, curing brick works etc. according to the direction of the responsible Engineer. Earthwork with soil carried by manual labor beyond normal borrow pit areas, but not less than 200 ft. First class brick work in cement mortar of 1:4 preparation in abutment, wing wall including cost of all materials and carriage there of 1000 ft. to 0 ins.
~application of clear fresh wateraHand cleaning of the bricks when necessary and sinking of bricks in clear water, curing of brickwork etc. as directed by Incinerator-in-charge. Earthwork in excavation in foundation trenches of Hydraulic Structure/. Bridge in all types of Ground with all leads and lifts including fixing if necessary, removal of. spoiled at a safe distance as per direction of.
