Design and Construction Method for Deep Tubewells Considering Different Hydrological Parameters
DESIGN AND CONSTRUCTION METHOD FOR DEEP TUBEWELLS CONSIDERING DIFFERENT HYDROLOGICAL PARAMETERS
Sajal Kumar Dutta
Shankar Kumar Debnath
Achinto Kumar Chakrabortty
DEPARTMENT OF CIVIL ENGINEERING
BANGLADESH INSTITUTE OF TECHNOLOGY, RAJSHAHI
September, 2001
ABSTRACT
Surface water is abundant in the wet season in Bangladesh. But during dry season, ground water ought to be the principal dry season source of water available in many areas in Bangladesh having agriculture potential. It is generally utilized where irrigation from surface source is difficult or impossible and water demand is high. Ground water pumping was, therefore, eminent and drilling and construction of deep tubewell were getting popular in almost all the areas except few spots because of either suspected or controversial lithological characteristics.
Although groundwater in Bangladesh is said to be abundant, a considerable areas of the country faces scarcity of groundwater within suction limit in the dry season. Due to the setting up tubewells in unplanned manner and over-exploitation of groundwater for irrigation purposes, the water level declines, rendering thousands of suction modes of shallow tube wells and deep-set hand pump tubewells inoperable. This project work deals with the design of deep tubewell with reasonable specific drawdown to overcome hazardous situation for more groundwater for irrigation in the dry season.
The important aspects of the work is to describe the formation samples and designing the tube well in order to minimize the amount of head loss due to movement of water through the aquifer. The lower the head loss, the smaller the drawdowns, less fuel have to be used to pump the water. We introduced a design system, which would make the specific drawdowns of the tubewells lower and more uniform than the existing deep tubewells by giving a logical flexibility in determining screen
Sajal Kumar Dutta
Shankar Kumar Debnath
Achinto Kumar Chakrabortty
DEPARTMENT OF CIVIL ENGINEERING
BANGLADESH INSTITUTE OF TECHNOLOGY, RAJSHAHI
September, 2001
ABSTRACT
Surface water is abundant in the wet season in Bangladesh. But during dry season, ground water ought to be the principal dry season source of water available in many areas in Bangladesh having agriculture potential. It is generally utilized where irrigation from surface source is difficult or impossible and water demand is high. Ground water pumping was, therefore, eminent and drilling and construction of deep tubewell were getting popular in almost all the areas except few spots because of either suspected or controversial lithological characteristics.
Although groundwater in Bangladesh is said to be abundant, a considerable areas of the country faces scarcity of groundwater within suction limit in the dry season. Due to the setting up tubewells in unplanned manner and over-exploitation of groundwater for irrigation purposes, the water level declines, rendering thousands of suction modes of shallow tube wells and deep-set hand pump tubewells inoperable. This project work deals with the design of deep tubewell with reasonable specific drawdown to overcome hazardous situation for more groundwater for irrigation in the dry season.
The important aspects of the work is to describe the formation samples and designing the tube well in order to minimize the amount of head loss due to movement of water through the aquifer. The lower the head loss, the smaller the drawdowns, less fuel have to be used to pump the water. We introduced a design system, which would make the specific drawdowns of the tubewells lower and more uniform than the existing deep tubewells by giving a logical flexibility in determining screen
References: Johnson and Johnson (1983), “Ground Water and Wells”. Jain Brothers, India. Todd, D.K. (1980), “Ground Water Hydrology”, 2 nd ed., John Wiley and Sons, Inc. Punmia, B.C. (1994), “Soil Mechanics and Foundations”, Laxmi Publication, New Delhi, India. Sir M. MacDonald (1984), “Well Design and Construction Manual– Guide to Supervisory Stuff”, BADC, Dhaka. Linsley, R.K., Kholer, M.A. and Paulhus, J.L.H. (1982), “Hydrology for Engineers”, 3 rd ed., Mcgraw-Hill Book Company, New York, USA. A. Feroze and R. Mujibur (2000), “Water Supply and Sanitation”, ITN-Bangladesh, Dhaka.