FARMER MANAGEMENT OF GROUNDWATER IRRIGATION IN ASIA: HYDROG OGICAL POTENTIALITY OF INTENSIVE FARMER-MANAGED TUBEWELL IRRIGATION SYSTEMS IN BANGLADESH: A CASE STUDY

M Sattar and K Haq

No 302007, IWMI Conference Proceedings from International Water Management Institute

Abstract: A FIELD STUDY was conducted in IO farmer-managed deep and shallow tubewell irrigated areas of Barind Tract Groundwater Basin, Bogra, Bangladesh. This had the specific objectives of: (i) assessing the groundwater recharge in the study area, (ii) evaluating the fluctuation of groundwa­ter table of aquifers and its response on rainfall and river water levels in the vicinity, (iii) evaluating the aquifer characteristics and properties, and (iv) recommending the safe utilization of tubewells based on discharge-drawdown relationship and well spacing for sustainable groundwater man­agement in crop production. The study indicated that the intensity of tubewells at present are 5 per square kilometer (km2) with an average discharge capacity of about 56 liters per second (lps). The average irrigated acreage of all the tubewells was 0.83 hectare/lps under the rice crop which was much above the national average (0.40 ha/lps). During the JO years from 1977 to 1986, the groundwater table was lowered indicating the highest lowering upto 7 .87 meters (m) in the month of March. This was below the operation level of shallow tubewells. A multiple regression relationship with groundwater table (Y) as dependable variable, and rainfall (XI) and river stage (X2) as independent variables was accomplished. The study revealed that there is a significant direct relationship among rainfall, groundwater table fluctuation and stream flow. The lithological investigations indicated that 100 percent screenable materials were available from a depth of 12 m and beyond. The average transmissivity and storage coefficient values were4,388 square meters per day (m2/day) and 0.000587, respectively, which indicated that the study area has potential for tubewell utilization. A model for safe well spacing was developed between discharge versus spacing of wells. The findings indicated that for shallow wells with a discharge rate from 11 to 20 lps, the spacing was in the range of 122 to 250 m. However, for deep tubewells with discharge capacities of 47 to 54 lps the spacing was in the range of 300 to 390 m for safe and sustainable utilization of groundwater.

Keywords: Environmental Economics and Policy; Resource/Energy Economics and Policy (search for similar items in EconPapers)
Pages: 15
Date: 1994
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Persistent link: https://EconPapers.repec.org/RePEc:ags:iwmicp:302007

DOI: 10.22004/ag.econ.302007

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