Hatirjheel Integrated Project: A Multi-purpose Urban Amenity

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Presentation transcript:

Hatirjheel Integrated Project: A Multi-purpose Urban Amenity M. Shah Alam Khan Professor, IWFM, BUET Institute of Water and Flood Management. Bangladesh University of Engineering and Technology

Project Objectives Stormwater detention Extending east-west road connectivity Preserving urban water ecosystem and environment Domestic wastewater management Water-based recreation and green corridor Water taxi

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Composite satellite photo of the area (Nasrin, 2014)

Catchment Boundary and Sub-catchments (Nasrin, 2014)

Land Use Pattern (Nasrin, 2014)

Demography Landform and Land Use Climate Stormwater Management Practices Function of detention basin: retain storm runoff temporarily and gradually discharge downstream as gravity flow Hatirjheel-Begunbari detention basin: largest stromwater detention basin in Dhaka Hydrologically linked to Dhanmondi, Gulshan and Banani lakes, and Mohakhali khal (box culvert). Combined flow discharged through Rampura regulator, gravity drainage through Begunbari Khal to the Balu river Catchment area: about 27.468 km2 Regulator constructed after 1988 flood

Stormwater detention capacity and function of the Hatirjheel basin reduced significantly because of encroachment, solid waste dumping, etc. Hatirjheel Integrated Project => Mainly to restore the detention area and for improved stormwater management Hatirjheel Integrated Project Hatirjheel lake: 0.774 km2 area Implementation partners: RAJUK, DWASA, LGED, BUET, BD Army Corps of Engineers Major Construction Work: Service road, Express road, 11 SSDS/CSO, 4 Bypass sewers, and bridge, culvert, viaduct, etc.

Water Level and Rainfall Water level hydrograph and rainfall for 1998 Mean water level hydrograph and 1:5 year rainfall (Nasrin, 2014)

Present Gate Operation Rule Maximum Allowable water level in the system: +5.5 m PWD Gravity-drainage (gates open) maintained until the external water level rises to +5.0 m PWD Gates are closed normally in early July & temporary pumping is required to maintain the maximum water level below +5.5 m PWD Gates are opened again when external water level falls below +5.5 m PWD & internal water level > external water level During two ‘critical periods’ (July 10 – 20 & September 10 – 25), gates are closed when external water level is +5.0 m PWD instead of +5.5 m PWD In a ‘normal’ flood year, the gates are closed from July to September

Inundated area at different inundation depths Inundation depth (m) Area (km2) Area (%) 3 0.14 9.2 4 0.25 16.12 5 0.41 26.8 6 0.74 47.9 Total 1.54 100 (Nasrin, 2014)

Flood Damage (Residential) Tangible damage Annual income and overall flood damage Income and flood damage for pucca households (Nasrin, 2014)

Flood duration and flood damage Flood depth and damage Flood duration and flood damage (Nasrin, 2014)

Intangible damage Intangible damage based on respondents’ perception Impact Increase (+) Decrease (-) Remains Same (0) Unsure (x) Employment opportunities 0% 88.6% 11.4% Income 77.1% 22.9% Consumption of food items 85.7% 14.3 Purchase of industrial items 82.9% 17.1% Prices of food items 100% Prices of industrial items 91.4% 8.6% Wage rates in industrial activities (Nasrin, 2014)

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