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1 2 3 4 5 Unit-11: Sherpur Platform Bogra Fairly thin (not exceeding 10m.) Average thickness Semi-confined. (1546). Barind and lower surface clays and silts sorted 30m. or more. Jamuna floodplain highly sequence of sands to depth of 30m. or Range : 15-60m. dissected uplifted area in the more followed by gravels. Basal clay Average : 30m. Barind and ridges and basin of 30m. thick occurs to a depth of in the flood plain 106m. Unit-12: Ganges (3152). Rajshahi Silty clay bands occur to over 30m. Average thickness Semi-confined. Ganges floodplain broad Pabna in places thin sand lenses common 70m. ridges and basin. with small aquifer potential. Below Range : 10-70m. 30m. coarser sediments with 70m. or more thickness. Average : 35m. Unit-13: Natore (1783) Rajshahi Surface clays 12-24m. thick Unknown but could Semi-confined. Ganges flood plain, ridges Pabna underlain by silts and fine sands to be 30 m. or more. and basins about 30m. this is followed by Range: 10-70m. coarser materials forming an aquifer. Average: 30m. Unit-14: Tarash (1301) Pabna 10m. of clays overlie a silty unit to Aquifer thickness not Semi-confined. Lower Jamuna flood plain and 18m. below which medium to coarse proven. typified by ridges and basins II. NE REGION: Unit-15: Eastern piedmont Bogra grained sands Range: 10m. or 50m. (1690) Jamalpur Surface clays 15 25m. thick with Limited thickness Dominantly Generally slopping and sands and silt leases overlying inter and extent semi-confined. piedmont alluvial plains, Mymen- calculated coarse sands and cays to considerable sandy near the hills but singh 50m. Sand aquifer coarsening reduction in aquifer becomes clayey down slope. downwards 40 to 75m with materials within Unit-16: Brahmaputra significant clays again 75m. to 110m. 100m. because of presence of extensive aquiclude clays. Range : 16-80m. Average : 40m. Floodplain (116) Jamalpur Thin surface clays and silts which Estimated aquifer Semi-confined to Old Brahmaputra flood plain overlie a rapidly coarsening series of thickness 30 m. or unconfined with ridge and basin relief sediments containing fine sand bands. 50m. predominating in the Sediments are coarsest is the west Range: 5-50m. meander flood plain, soil are and become finer in the east with Average: 20m. well. thickening of surface clays. Unit-17: Old Brahmaputra Jamalpur 3 to 9m. surf ace clays overlying Aquifer thickness Generally Channel (1048) Mymen- micaceous, silty fine sands ranges from 30 – unconfined Active flood plain typified singh coarsening downwards to uniform 50m. by ridges and basin with and medium sands. Range: 15-80m. silts in the ridges and clays Kishore- Average: 40m. in the basins. gonj Unit-18: Palaeo Mymen- Generally 10-15m. of surface clays Thickness of aquifer Unconfined to Brahmaputra (2011) singh overlying uniform medium to coarse not ascertained fully mainly semi- Old and oldest Brahmaputra and sands, sub-divisible into two sub but exceeds 100m. confined flood plain characterized by Kishor- units one with inter- mediate Range: 15-80m ridges and basins. gonj aquiclude absent and the other with present. Average: 40m Unit-19: Sylhet Basin Sylhet Very little in known about sub- Not known Not known but (4056) and surfaces geology sedimentary survey probably semi- Sylhet Basin a subsided area Mymen- indicates total sedimentary thickness confined to subjected to deep flooding singh over 10 m. the areas is actively subsiding with the risibility that large thickness of silts and clays being deposited. confined. Unit-20: Surma Basin Sylhet Deep subsurface geology known Not known Not ascertained (9222). seismic survey which indicates total but probably Eastern Surma basin: sediments exceeding 10 .. few tube semi-confined to smooth relief with broad, wells drilled in the northern fringe of confined. almost level, ridges and the unit indicate varying thickness of basins. Grey silty soils silts and clays over lying a reasonable occuron the ridges and clay in the basins. aquifer. Continued next page A-20 PDF created with FinePrint pdfFactory trial version http://www.fineprint.com
1 2 3 4 5 Unit-21: Madhupur Transition (1944). Old Brahmaputra and lower Jamuna floodplain with broad ridges and basins. Unit-22: Madhupur Dhaka (4394). Madhupur tract a fault bounded zone distinguished by poorly drained level highland areas and well drained highland areas. The landscape is dissected in places. Unit-23: Mymensingh Trough (3008). Old and oldest Brahmaputra floodplain and part of Madhupur tract. Unit-24: Old Meghna floodplain and Sylhet basin. Unit-25: Eastern Hills (3194): Eastern hills NS and EW trending Dupi Tilla sediments; deep red brown terraces soils; southern piedmont deposits having a lower proportion of basin clays and a higher silt content. Unit-26: Padma (2366). Lower Jamuna and Ganges floodplains with broad ridges and basins. Unit-27: Young Meghna (3211). Young Meghna floodplain with ridges and predominating and old Meghna floodplain with dominantly level surface. III. SW REGION: Unit- SW-1: Old Gangetic Floodplain. Part of Gangetic moribund delta with linear ridges comprising of level to very gently undulating levees, inter ridge depressions and stream beds of dominant topographic elements. Unit SW-2: Young Gangetic Floodplain. The unit comprises meander floodplains landscape of ridges, young channels and widespread development of past basins. Tangail and Dhaka Tangail and Dhaka Mymensingh and Kishor- ganj. Sylhet, Comilla and Dhaka. 10m. or so surface clays overlie gray fine sands followed by brown sands of various grain sizes to various depths. Madhupur clay with thickness up to 20m. or over occurs extensively throughout the region. Under the clay, medium to coarse sands with this hands of the fine waterfalls are encountered. Part of place Brahmaputra Unit, but down faulted resulting in 40-50m. of recent fine sands over Pleistocene sands and gravels. Unit is a southern extension of the Sylhet Basin Limited data do not allow assessment of lithology in the north, but existing wells in the south indicate a thin (ca. 3m.) layer of surface clay/silt overlying a sequence of fine sands which coarsen with depth. Sylhet Unit consists of folded tertiary sediments- Dupi Tilla sandstones constitute surface sediments. Tangail and Dhaka Dhaka and Comilla. Kushtia, Jessore, Faridpur and Khulna. Faridpur, Khulna and Barisal. Very little is known about the subsurface geology. Limited data indicate that the unit is similar to the Atrai basin and presumed that relatively thick occur, underlain by a sandy aquifer. Little data exists on the subsurface geology. Limited data indicate that clays, 3 to 20m. thick are underlain by a mixture of sands and silts. Predominantly medium to coarse grained, well sorted sand grading upward to fine sand to silty sand and clay with distinct fining up sequences. Capped by 10 to 60m. stlty/sandy surface clay. Medium to fine grained sand constitutes the suffer materials. 30- 60m. of surface clay with abundant peat layers covers the aquifer. A-21 Not known Range: 10-70m. Average: 45m. Aquifer thickness could be as such as 60 m. 0r more. Range: 15-90m. Average: 40m. Thickness not ascertained but could be over 50m. Range: 15-90m. Average: 40m. Thickness of aquifer not ascertained. Range: 20-80m. Average: 45m. Aquifer thickness not ascertained. Not known Not known. Range: 10-75m. Not known. Range: 16-100m. Average: 60m. Aquifer thickness is around 100m.; base rarely reached. 10 to 60m. with an average of 30m. Aquifer thickness average 55m. Depth to the main aquifer averages 40m. PDF created with FinePrint pdfFactory trial version http://www.fineprint.com Semi-Confined to unconfined Semi-Confined Semi-Confined Semi-Confined to confined Semi-Confined to confined multiple Unknown, but probably semiconfined to confined. Unknown, but likely to be semiconfined to confined. Extremely unconfined, locally semiconfined and confined. Semi-confined to unconfined, locally multiple. Continued next page
Page 1 and 2: Government of the People’s Republ
Page 3 and 4: Presentation of the Report Abbrevia
Page 5 and 6: A-44 ANNEX I MINISTRY OF LOCAL GOVE
Page 7 and 8: PDF created with FinePrint pdfFacto
Page 21 and 22: CONTENTS INTRODUCTION 1 GEOMORPHOLO
Page 23 and 24: The Flood plain and the Bengal Delt
Page 25 and 26: composed of alternating beds of san
Page 27 and 28: Lalmai Hills area is considered as
Page 29 and 30: C E N O Z O I T E R T I A R Y N E O
Page 31 and 32: Upzilas Partially Covered by Safe A
Page 33 and 34: A-15 Annex- 6 Upzilas Completely an
Page 35 and 36: Fig 2. Map showing the area of arse
Page 37: Table 4.2 Aquifer Types and Charact
Page 41 and 42: Table 4.3 The Main Aquifers in Bang
Page 43 and 44: 19 Kushtia 709.85 2500 0.0072 0.252
Page 45 and 46: Table 4.11 Estimates of Flow and Ti
Page 47 and 48: Table 4.16 Approximate Wet Season R
Page 49 and 50: Table 5.3 Summary of Pre-Existing L
Page 51 and 52: Table 5.5 Arsenic Results of Repres
Page 53 and 54: Table 5.16 Arsenic Statistics for t
Page 55 and 56: Sl # DIVISION DISTRICT UPAZILA As C
Page 57 and 58: Sl # DIVISION DISTRICT UPAZILA As C
Page 59 and 60: Geological Survey of Bangladesh\ Ge
Page 61 and 62: Upazila: Akhaura, Brahmanbaria Sada
Page 63 and 64: Dumuria Upazila, Khulna District #
Page 65 and 66: information to write such a report.
Page 67 and 68: 2.1 Introduction CHAPTER II Physiog
Page 69 and 70: Fig. 2.2 Physiographic Map of Bangl
Page 71 and 72: 2.3.3 The Pleistocene Uplands cover
Page 73 and 74: winter when the volume of water pas
Page 75 and 76: country. The central part represent
Page 77 and 78: Fig. 3.2b. Schematic Crustal Cross
Page 79 and 80: 3.1.6 During the Pleistocene and Ho
Page 81 and 82: Fig. 3.5 Lithologic Column Showing
Page 83 and 84: microfossils have been assigned Upp
Page 85 and 86: 3.4 late Pleistocene-Holocene in Be
Page 87 and 88: marine and fresh water peat. After
Page 89 and 90:
Organic matter from the uppermost p
Page 91 and 92:
3.4.4 Proposed Divisions of the lat
Page 93 and 94:
3.4.4.4 Late Pleistocene -Early Hol
Page 95 and 96:
4.1 Introduction CHAPTER IV Aquifer
Page 97 and 98:
Fig. 4.1 Groundwater Development Zo
Page 99 and 100:
Fig. 4.3 Revised Hydro-geological M
Page 101 and 102:
Quaternary. Due to neo-tectonic act
Page 103 and 104:
4.7.2 The sediment from the surface
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4.10 Recharge of the aquifers 4.10.
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4.10.5 The regional hydraulic gradi
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Fig. 4.11 Geological Cross Section
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(centrifugal) pump. BADC defines th
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5.4.2 From 1993 different organizat
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5.4.6 NGO Forum and Grameen Bank ha
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These areas are as follows. 1. The
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5.6.3 BGS-DPHE (2001) shows that wa
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continually replenished with a resi
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5.7.2 Some test results of ground s
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CHAPTER VI CONCLUSIONS ♦ Arsenic
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The JICA report mentions that, "The
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working on ground water under one u
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sections of the sediments of the de
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♦ Soil arsenic analyses in the ar
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Bhattacharya, A. and Banerjee S.N,
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Ministry of Women and Children Affa
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Aquifer Systems of Bangladesh 4.1 I
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Fig. 4.3 Revised Hydro-geological M
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Table. 5.4 Summary of Regional Arse
Page 145 and 146:
As Arsenic List of Abbreviations Us
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EXECUTIVE SUMMARY 1. Ministry of Lo
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9. The exact number of hand pumps u
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areas ground water can still play a
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