Abstract
Irrigated agriculture has been playing a vital role for the growth in crop production in Bangladesh. Minor irrigation comprising of shallow tubewells (STWs), deep tubewells (DTWs), hand tubewells (HTWs) and low-lift pumps (LLPs) is a major irrigation system in the country. Poor performance of irrigation is an issue for the expansion of irrigated area. The present study was carried out to examine the conveyance efficiency and rate of irrigation water loss in DTW schemes in Bogra, Thakurgaon and Godagari zones of Barind Management Development Authority. There were various types of water distribution identified in these schemes with including Poly Venyl Chloride (PVC) buried pipe, cement concrete (CC) rectangular, Ferro trapezoidal, Ferro semicircular and rectangular earth drain. The average conveyance efficiency of PVC buried pipe for Bogra, Thakurgaon and Godagari zones ranged from 94.46% to 95.37% and rate of water loss ranged from 5.45% to 9.55% in three study zones. Average conveyance efficiency of CC rectangular for Bogra and Godagari zone ranged from 91.20% and rate of water loss from 6.58% to 9.93%. Average conveyance efficiency of Ferro trapezoid for Bogra and Godagari zone ranged from 87.80% to 90.06% and rate of water loss ranged from 9.94% to 12.21%. Average conveyance efficiency of Ferro semicircle for Bogra and Godagari zone ranged between 88.13% and 86.82% and rate of water loss between 11.59% and 11.68%. Average conveyance efficiency and rate of water loss of rectangular earth drain Godagari zone was 58.66% and 42.29% respectively. About 80% farmers recommended buried pipe irrigation system and about 20% semi-circular channel. The study suggests that the improved water distribution system as developed by BMDA is sustainable to increase productivity of irrigation systems in Bangladesh. DOI: http://dx.doi.org/10.3329/jbayr.v1i2.10032
Highlights
Ggrowth in crop production in the country primarily depends on the irrigation development
The present study evaluates performance of irrigation water distribution system developed by BMDA in the northwest region of Bangladesh
Iii) Godagari Zone Table 3 shows that the conveyance efficiency of Poly Venyl Chloride (PVC) buried pipe, CC rectangular, ferro trapezoidal, ferro semi-circular and rectangular earth drain system for Fazilpur and Sormongla is 94.46%, 89.1%, 87.8%, 86.82% and 58.66% respectively
Summary
Ggrowth in crop production in the country primarily depends on the irrigation development. The irrigation area covers about 30 ha This scheme is located at about 20 km south of RDA, Bogra and l7 km from Sherpur upazila headquarters under Bogra district. The area under irrigation is approximately 76 ha This scheme is located at about 30 km north from RDA, Bogra and 13 km from Kotowali thana headquarters under Bogra district. The area under irrigation is approximately 19 ha It is located at about 4 km north-east from Thakurgaon town. The area under irrigation is approximately 22.7 ha It is located at about 5 km north-east from Godagari town. There are four types of open channel and underground pipe namely, pre-cast ferro-cement semi-circular, trapezoidal, cast in-situ CC rectangular, rectangular earth drain and underground buried pipe (PVC) of 381 m, 762 m, 810 m, 854 m and 915 m respectively which were constructed in 2004.
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