Design and Construction Method for Deep Tubewells Considering Different Hydrological Parameters

18168 Words Aug 26th, 2009 73 Pages
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
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alizes 50 6.3 Verticality 51 6.4 Straightness 52 6.5 Gravel Pack 53

Chapter 7 Development of Well 58

7.1 Introduction 58 7.2 Preliminary Operation 59 7.3 Conventional Methods of Development in Bangladesh 60 7.3.1 Over Pumping 60 7.3.2 Back washing 61 7.4 Recommended Methods 63 7.4.1 Combination of Over Pumping and Back Washing 63 7.4.2 Positive Backwash Airlift Development 66 7.5 Commencement and Duration 67 7.6 Checking the Sand Content 68 7.7 Additional Gravel Pack 68 Page

Chapter 8 Pumping Test 69

8.1 Introduction 69 8.2 Equipment 69 8.3 Commencement 70 8.4 Details of the Test 70 8.5 Pumping Test Procedure 72 8.6 Water Samples, pH and EC Measurements 74

Chapter 9 Construction of Tubewell House and Discharge Box 75

Chapter 10 Details of the Project Work 76