proposed integrated complex for delhi judicial academy

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
4.7.2 Drainage Pattern
Drainage has two aspects – flood protection and storm water discharge, which are interrelated. The
storm water and flood protection in Delhi are not local but have regional bearing including areas of
Haryana and Rajasthan. The main drainage system of Delhi is such that all water collected through
main drains, link drains and small rivulets is discharged into Yamuna. On the basis of topographical
characteristics and existing drainage network, NCT of Delhi has been divided into five drainage
basins namely Najafgarh, Alipur, Shahdara, Khushak nallah and Mehrauli. The major portion of
NCT – Delhi is being drained by Najafgarh drain leading to Yamuna River. Most of these drains
mainly carry the urban sewage and industrial effluents. Figure 4.9 shows the drainage system in
NCT Delhi. The relief and soil conditions cause localized stagnation during rainy season. During
high rains and high floods in Yamuna River, the drainage system becomes ineffective as the outlets
of rainwater blocked.
There is a natural surface storm water drain close to the proposed project site. This carries the
discharge to the Najafgarh drain. The wastewater is normally carried away by the sewer lines which
exist in the project area.
4.7.3 Ground Water Quality
Assessment of baseline data on water environment includes:
• Identification of ground water sources
• Collection of water samples
• Analyzing water samples collected for physico – chemical and biological parameters
Assessment of water quality in the study area was done to assess the parameters as per the Indian
standard IS 10500 (drinking water standard). Four ground water samples from borewells /
tubewells from various locations in and around the proposed project site within the core zone were
collected during summer season 2006 for assessment of the physico – chemical quality.
75