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«URBAN FLOODING AND ITS MANAGEMENT 1.0 INRODUCTION Flooding in general and urban flooding in particular is not a un- known event in world and in ...»

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8.0 Conclusions Mindless urbanisation, encroaching upon and filling up natural drainage channels and urban lakes and water bodies to use the high-value urban land for buildings, illegal colonies and industries, increase in paved area, heavy downpours over Delhi and heavy discharges in Yamuna and Sahibi river. Delhi has suffered heavy floods in past. Planning has been thrown to the winds. The flooding has several impacts /effects on human-lives, animals, trees, plantations, eco-system of the area. If not taken seriously, it may cause a great set back to civilizations. The preventive measures like improvement of drainage efficiency, construction of flood–protection structures, increasing areas around the city to serve as retention basins, adopting rain water harvesting system, water recharging of channels, etc are some of the preventive measures to curb urban flooding. The main responsibility in curbing the Delhi flooding rest with Irrigation and flood control department of the Delhi Govt which has taken many steps in this regard like strengthening of embankments of river Yamuna, c/o supplementary drain and its deepening and lining to increase its carrying capacity to 5000 cusecs. The carrying capacity of Najafgarh drain has also been increased from 5000 to 10000 cusecs by deepening and lining in city area. The NG drain has also been used for water retention.

Check dams, recharge well, creation and revival of water bodies has also been under taken by I &FC dept. Besides this, I&FC dept is also working out a fresh Drainage plan of Delhi associating DJB, MCD, DDA, PWD etc to further take action on curbing the flooding in Delhi. The political will is also of prime importance to curb/reduce urban flooding by enacting legislations and getting it implemented faithfully. A lot of experience has been gained with recurring floods in Delhi. A proper authority under head of the state should look after the flood control measures with implementation in time bound manner as nothing is costlier than a life in the world.

Er. M C T Pareva, Chief Engineer, Irrigation and Flood Control, Govt of N C T Delhi.

Pareva, areva Setup central control rooms by MCD and NDMC, Police, Transport, Health, Home Guards & Civil Defence, Food & Civil Supplies, Flood Control Deptt., Delhi Development Authority, Education Department, P.W.D., Govt. of Delhi, BSES, NDPL, Delhi Jal Board The territory of Delhi has been experiencing floods mainly from Sahibi Nadi (passing through Najafgarh Drain in Delhi) and Yamuna River. Moreover, local drainage system has also been, at times, found to be inadequate to meet the requirement, when there is heavy rain fall or during floods.

The functions of Central Flood Control Room:

to receive flood warnings and to submit Flood situation reports to the Chief Minister, Chief Secretary, Divisional Commissioner and Secretary (I&F) every evening, to issue necessary Flood warnings and directions for evacuation, to arrange necessary food articles and relief supplies, to maintain Liaison with Upper Yamuna Division of C.W.C., R.K. Puram, New Delhi and Army/Air Force, when required. To maintain a fleet of vehicles needed for mobility of staff and the relief measures (Relief Camp) shall assist the Sector Officer in the process of evacuation and rehabilitating the affected persons in the relief camp. He shall maintain record of the persons/ families in the camp and make arrangements for providing items of daily use and to ensure adequate health, sanitation, water supply and street light facilities.

Total DJB’s Pumps-installations are 70 Nos. with capacity of 1000cusec.

The floods of the years of 1924, 1947, 1955, 1956, 1967, 1971, 1975, 1976, 1978 are the main examples of the flooding in River Yamuna when the normal lives of the residents of Delhi were either disturbed or threatened, badly.

Years: 1967, 1971, 1975, 1976, 1978, 1988, 1995 and 1998

Flood of 1978 Out of the above the flood of 1978 has been the highest recorded in the available history of River Yamuna which was recorded as 207.49 m (680.75 ft.) on 5/6 September, 1978 at Delhi Old Railway bridge, with a discharge of 7175 cumecs (2,53,350 cusecs). The right marginal bund between palla village and Bawana Escape out-fall also breached which caused a very large area of Alipur block and urban colonies like Adarsh Nagar, Model town, Mukerji Nagar submerged under deep water. Apart from the damages estimated at nearly Rs. 10 crores, eighteen lives were lost and thousands of people were rendered home less. On the left bank also Shahdara marginal bund reached the point of distress but could be saved by raising its heights in certain reaches with earth filled bags.

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