Lok Sabha Question No. 2550 (UNSTARRED), answered on 2022-12-22
Subject: Storm Water Management in Delh
Ministry: JAL SHAKTI
Asked by: Parvesh Sahib Singh

## GOVERNMENT OF INDIA

## MINISTRY OF JAL SHAKTI, DEPARTMENT OF WATER RESOURCES, RIVER DEVELOPMENT & GANGA REJUVENATION

## LOK SABHA

## UNSTARRED QUESTION NO. 2550

ANSWERED ON 22.12.2022

## STORM WATER MANAGEMENT IN DELHI

## 2550 SHRI PARVESH SAHIB SINGH VERMA

Will the Minister of JAL SHAKTI be pleased to state:-

(a) whether the Government has prepared any plan or project for Storm Water Management in Delhi and if so, the details thereof;

(b) whether the Government has carried out any study about the effect of storm Water management on ground water of Delhi and if so, the details thereof;

(c) whether the Government is aware of sewage entering storm water drains and causing environmental issues and if so, the steps taken by the Government to address this issue; and

(d) whether the Government has directed Delhi Jal Board to deal with the problem of encroachment of storm drains and if so, the details thereof?

## ANSWER

## THE MINISTER OF STATE FOR JAL SHAKTI (SHRI PRAHLAD SINGH PATEL)

(a) The  Master  Plan  for  Artificial  Recharge  to  Ground  Water  -  2020  has  been  prepared  by  Central Ground Water Board (CGWB) jointly with State Governments including the Government of NCT, Delhi. The  master  plan  is  a  macro  plan,  formulated  to  work  out  the  feasibility  of  various  structures  for  the different terrain conditions of the country and respective estimated costs, providing a broad outline of the project and expected investments.

The Master Plan inter-alia is meant to manage storm water flows in Delhi. As per the Master Plan, in Delhi, out of 175 Million Cubic Meters of estimated rainfall runoff including storm water, 24 MCM can be utilized for artificial recharge to ground water.  To utilise the surplus runoff, 12 nos. of Check Dams, 22,706  nos.  of  Recharge  Shaft/Recharge  Trench  and  3,04,500  nos.  of  Roof  Top  rain  water  harvesting structures  were  envisaged.  The  Implementation  has  to  be  done  through  existing  schemes  of  State Governments  and  no separate scheme/fund has been envisaged for implementation by Central Government.

(b) CGWB has  carried  out  various  demonstrative  artificial  recharge  projects  in  Delhi  under  Central Sector Scheme during VIII & IX Plan period. The details are as follows- i. In JNU and IIT comprising 5 microsheds, 0.46 MCM storm water was utilized for recharge to ground water through the construction of four check dams with a storage capacity of 49,000 cubic meters. The impact of upto 4 m rise in water level in the area has been observed.

- ii. The Kushak Nala, Delhi has a catchment of 3.5 sq. km. and about 1,42,000 Cubic meters of unutilized runoff from the Nala has been utilized to recharge the ground water through two gabion bunds and 2 Nala bunds which resulted in 20cm rise in water level in the area.
- iii. The Lodhi Garden, Delhi spreads over an area of 36 ha and about 25,000cubic meters of water from the garden and its adjoining area during precipitation have been utilized for recharge through the construction of three lateral shafts and three recharge pits. Due to this rise in ground water level of about 35 cm in the area has been observed.

CGWB also monitors ground water quality in the vicinity of major drains in Delhi. The ground water quality data so generated is attached at Annexure.

(c) As informed by Delhi Jal Board, at present 81% of the Delhi is covered under Sewerage system.  In the  remaining  19%  of  the  area  including  1799  unauthorised  colonies,  network  is  being  extended  in  a phased manner.

It  is  possible  that  in  unsewerd  areas,  sewage  would  be  entering  the  storm  water  drains.  The  steps taken for providing sewer network in 1799 unauthorised colonies is as under:-

I. Sewer network has been extended to 725 unauthorized colonies.

II. Works are in progress for laying sewer network in 572 unauthorized colonies.

III. Works of laying sewer network in 341 unauthorized colonies are being taken up in phased manner depending  on  availability  of  land  for  construction  of  Sewage  Treatment  Plants  and  Sewage  Pumping Stations from land owning agencies i.e DDA and Revenue Department, Govt. of Delhi. Matter is being followed up with land owning agencies for early allotment of land parcels.

IV. There are 161 unauthorized colonies where NOC is awaited as these fall under O-zone/under forest area/ ASI area etc.

(d) All the natural drains needs to be kept obstruction free. Ideally, the storm water should flow through its designed natural drainage system. Accordingly, NGT and NMCG has issued directions to keep some drains like Subhash Nagar etc. uncovered, to avoid encroachments on it and to ensure its regular cleaning.

## ANNEXURE

## ANNEXURE REFERRED TO IN REPLY TO PART (b) OF UNSTARRED QUESTION NO. 2550 TO BE ANSWERED IN LOK SABHA ON 22.12.2022 REGARDING 'STORM WATER MANAGEMENT IN DELHI'.

| Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021        | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   | Ground Water Quality 2021   |
|-----------------------------|-----------------------------|----------------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|-----------------------------|
| S.No.                       | Drain Name                  | Location of the PZ               | Sour ce                     | pH                          | ECin µS/cm at 25 0 C        | CO 3                        | HCO 3                       | Cl                          | SO 4                        | NO 3                        | F                           | PO 4                        | Ca                          | Mg                          | Na                          | K                           | SiO 2                       | THas CaCO 3                 |
|                             |                             |                                  |                             |                             |                             | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        | mg/l                        |
| 1                           | Barapulla Drain             | Sunder Nursery                   | TW                          | 8.68                        | 619                         | 28                          | 327                         | 35                          | 5                           | 9.9                         | 0.45                        | <0.01                       | 12                          | 29                          | 105                         | 2.8                         | 19                          | 150                         |
| 2                           | Najafgarh Drain             | Majnu ka Tila                    | DW                          | 8.05                        | 2554                        | 0                           | 256                         | 542                         | 238                         | 115.56                      | 0.51                        | <0.01                       | 80                          | 71                          | 310                         | 120                         | 19                          | 490                         |
| 3                           | Drain No.8                  | Bhalaswa Lake                    | HP                          | 7.87                        | 4744                        | 0                           | 171                         | 1334                        | 361                         | 1.6                         | 0.71                        | <0.01                       | 224                         | 168                         | 561                         | 11                          | 21                          | 1251                        |
| 4                           | Najafgarh Drain             | Najafgarh                        | TW                          | 8.24                        | 269                         | 0                           | 99                          | 27                          | 62                          | 3.3                         | 0.44                        | <0.01                       | 32                          | 15                          | 8.87                        | 3.7                         | 17                          | 140                         |
| 5                           | Shahdara Drain              | Gazipur Crossing                 | TW                          | 8.43                        | 704                         | 28                          | 212                         | 124                         | 18                          | 6.6                         | 0.42                        | <0.01                       | 28                          | 34                          | 95                          | 8.8                         | 15                          | 210                         |
| 6                           | Drain No.8                  | Sanjay Gandhi Transport Nagar Pz | Pz                          | 7.42                        | 12780                       | 0                           | 312                         | 3800                        | 870                         | 0.2                         | 0.44                        | <0.01                       | 629                         | 314                         | 1700                        | 17                          | 22                          | 2812                        |

| Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   | Ground Water Quality (Heavy metals), 2021   |
|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|---------------------------------------------|
| S.No.                                       | Drain Name                                  | Location of the PZ                          | Source                                      | Chromium                                    | Manganese                                   | Iron                                        | Nickel                                      | Copper                                      | Zink                                        | Arsenic                                     | Selenium                                    | Silver                                      | Cadmium                                     | Lead                                        | Uranium                                     |
|                                             | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per million (ppm)                     | Parts per billion (ppb)                     | Parts per billion (ppb)                     | Parts per billion (ppb)                     | Parts per billion (ppb)                     | Parts per billion (ppb)                     | Parts per billion (ppb)                     |
| 1                                           | Najafgarh Drain                             | Majnu ka Tila                               | DW                                          | 0.003                                       | 0.055                                       | 0.029                                       | 0.005                                       | 0.002                                       | 0.009                                       | 0.641                                       | 0.239                                       | BDL                                         | 0.042                                       | BDL                                         | 9.599                                       |
| 2                                           | Barapulla Drain                             | Sunder Nursery                              | TW                                          | BDL                                         | 0.061                                       | 0.028                                       | BDL                                         | BDL                                         | 0.019                                       | 0.243                                       | 0.083                                       | BDL                                         | 0.067                                       | BDL                                         | 10.900                                      |
| 3                                           | Drain No.8                                  | Bhalaswa Lake                               | HP                                          | BDL                                         | 0.252                                       | 3.392                                       | BDL                                         | BDL                                         | 1.575                                       | 0.134                                       | 0.085                                       | BDL                                         | 0.035                                       | BDL                                         | 4.543                                       |
| 4                                           | Najafgarh Drain                             | Najafgarh                                   | TW                                          | BDL                                         | 0.006                                       | 0.020                                       | BDL                                         | BDL                                         | 0.260                                       | 1.179                                       | 0.034                                       | BDL                                         | 0.106                                       | BDL                                         | 1.690                                       |
| 5                                           | Shahdara Drain                              | Gazipur Crossing                            | TW                                          | BDL                                         | 0.074                                       | 0.016                                       | BDL                                         | BDL                                         | 0.290                                       | 0.387                                       | 0.012                                       | BDL                                         | 0.081                                       | 0.227                                       | 7.209                                       |

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