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Prospects of Artificial Recharge for Augmentation of the Upper Dupi Tila Aquifer in Dhaka City, Bangladesh

Workshop on ACTION RESEARCH ON GROUNDWATER BUFFERING IN BANGLADESH 24 February, 2011. Prospects of Artificial Recharge for Augmentation of the Upper Dupi Tila Aquifer in Dhaka City, Bangladesh. Sarmin Sultana Department of Geology, University of Dhaka. Presentation Outline.

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Prospects of Artificial Recharge for Augmentation of the Upper Dupi Tila Aquifer in Dhaka City, Bangladesh

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  1. Workshop on ACTION RESEARCH ON GROUNDWATER BUFFERING IN BANGLADESH 24 February, 2011 Prospects of Artificial Recharge for Augmentation of the Upper Dupi Tila Aquifer in Dhaka City, Bangladesh Sarmin Sultana Department of Geology, University of Dhaka

  2. Presentation Outline • What is AR & what are the techniques • Why AR in Dhaka city • What is the source of water for AR • Objectives of this study • Results and discussion • Conclusions • On going research

  3. The Megacity Dhaka Needs no introduction Water Demand and Supply

  4. Why AR in Dhaka city Uniqueness of Dhaka in terms of GW problem • GW Dependant City • No imported water • Big Gap between supply and Demand • Heavy GW abstraction and well deepening • Rate of water table decline 3.5 m/y • Aquifer dewatering No GW management !

  5. Cone of depression 1970 1980 1995 2007 GW hydrograph of Upper Dupi Tila demonstrates a steady down ward slope. Water Table Elevation Contour for dry season as on 2008

  6. Is going Deep a sustainable Solution?

  7. Rainfall in Dhaka Mirpur (GT-2648010) Dhaka station (R009} GW hydrographs and corresponding 7-day rainfall are plotted for 1977 and 1993.

  8. Objectives • To estimate the current open space available for natural recharge to take place; • To delineate potential zones for implementing site-specific artificial-recharge techniques using GIS analysis; and • To assess suitability and applicability of Artificial Recharge in Dhaka.

  9. Natural Recharge Area Map Bar Diagram of Recharge Area Classes Area in %

  10. Infiltration Test at the pond of Institute of Fine Arts Status of the pond immediate after rain Status of the pondafter 3 days from raining

  11. Potential Zones Rules for selecting prospective zones of artificial recharge

  12. Volume of Rainwater Available in Dhaka city (Sources: BBS) If 30 % of this water can be collected, then more than 100 MLD water will be available to recharge the aquifer artificially. Number of abandoned wells of DWASA. Production well Production well Other Options Dredging and re-excavation of khals Avoid construction along faults River dredging and Bank filtration Systematic Clay Mining Abandoned well

  13. Site Specific Artificial Recharge Technique Map Rules for selecting sites of definite artificial recharge methods • Dhaka has high potential for Artificial Recharge

  14. THANK YOU Workshop on ACTION RESEARCH ON GROUNDWATER BUFFERING IN BANGLADESH 24 February, 2011

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