proposed integrated complex for delhi judicial academy

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Rapid Environmental Impact Assessment (REIA) Study for Proposed Integrated Complex for Delhi Judicial Academy, National Law School, and National Institute for Mediation & Conciliation at Dwarka, New Delhi • Day Time is from 6.00 am to 10.00 pm, Night time is 10.00 pm to 6.00 am • Silence zone is defined as area up to 100 meters around premises of hospitals, educational institutions and courts. Use of vehicle horns, loud speakers and bursting of crackers are banned in these zones. 4.7 Water Environment The study area, a part of South West District of Delhi, receives about 81.2% of the annual rainfall during the monsoon months June to September. On an average, rain of 2.5 mm or more falls on 38.3 days in a year in this region of Delhi. The annual average rainfall is about 792.8 mm based on 22 years of data (Source: IMD). 4.7.1 Ground Water Hydrology Delhi is situated on the banks of the river Yamuna. The river Yamuna flows from north to south. A hard rocky ridge running from the Southern border of NCT in the south west in a north easterly direction to the western banks of the river Yamuna near Wazirabad barrage forms the main watershed in NCT of Delhi. The topography created a drainage system that carries rain and storm water from the higher elevations of the West to the Yamuna. The eastern low-lying side was originally part of the flood plain of the river and considered unhabitable. Today however this Eastern wing, also known as the Trans Yamuna area, houses about 23% of the total population of Delhi. The hydro geological situation is characterized by the occurrence of alluvial and hard rock formations and controls the groundwater availability in the territory. The quality of the groundwater in the hard rock formation in Delhi is generally potable, whereas in the alluvial formation groundwater, the water quality deteriorates with depth. Hard rock formation is found to be in North East – South West to North North East – South South West with steep dips towards South East and East. During 1960 – 2001, ground water levels were observed to have declined by 2 – 6 m in most parts of the alluvium areas. A decline of 8 – 20 m is recorded in Najafgarh Block and in Mehrauli Block the decline is 8 – 35 m. Dwarka is located in the western part of the NCT Delhi, on older alluvial plains. Dwarka’s hydrology is characterized by the proximity of the Najafgarh Drain which forms the western limit of the sub-city, and constitutes an important source of groundwater recharge. In the Dwarka clay and kankar formation exists in the top layer upto a depth of 4m below ground level. This layer of clay is followed by kankar and silt upto a depth of 68 m below ground level. The thickness of the 70
Rapid Environmental Impact Assessment (REIA) Study for Proposed Integrated Complex for Delhi Judicial Academy, National Law School, and National Institute for Mediation & Conciliation at Dwarka, New Delhi alluvium is about 300 m in the area and potential aquifers can be found at depths up to 240 meters below ground level (Figure 4.6). As shown in Figure 4.7, the western part of NCT shows a rapid decline in water levels due to tapping of groundwater for domestic and agricultural uses. The depth of water tables increases from 5m to 12 m as we move away from the drain. A comparative study of water level map of 1960 and 2002 shows in Dwarka the water level which was at 2 to 5m below ground level has gone down to 5 to 10 mts below ground water level. There are number of deep tubewells in the area producing about 25,000 – 30,000 m 3 /day. The potable quality of water is mostly available at the depth of 15- 20 meters below ground level. The main problem in Dwarka, as far as groundwater resources are concerned is the occurrence of brackish and saline water in the deeper aquifers. In the Northern part of Dwarka, salinity occurs at all levels (Figure 4.8). High concentrations of fluoride have also been found in samples collected by the Central Ground Water Board. According to the calculation of the Central Ground Water Board, the total reserve of potable water is limited to 16 Million Cubic Meter (MCM) 2 . The requirement of the current population is considered to be 28 Million Liters per Day (MLD), for an available supply of 12 MLD. The annual gap represents 16 MLD (around 6 MCM). South Western district of Delhi are comparatively at a disadvantage situation in terms of providing piped water supply, as the water treatment plants are located in northern part of Delhi. The government is able to supply only 74 lpcd (litres per capita per day). The demand and supply gap in this district keeps on increasing high because of large scale development in the residential sector. To meet this demand supply gap, a new water treatment plant is being proposed which will reduce the dependency on the ground water fro potable purpose. 71
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