Why is Delhi Water Logged It’s Drains and Sewers Clogged



Manohar Khushalani


A city like Delhi which draws its water from the river, follows a cycle similar to the Hydrological Cycle of Nature.  Water is supplied by the municipalities to the residents.  Some of the water is utilized for drinking purposes, some for watering the gardens and some for cleaning, washing and bathing and some for flushing the toilets.  The latter two ideally enter the sewage system.  The rain that falls over the city enters the storm water drains which empty into huge nullahs, which in turn empty into the river Yamuna.

This system can also enable rain water harvesting because the storm water drains can be utilized for water harvesting in an organized fashion.  But the storm water drainage system of Delhi is complex owing to a combination of natural and man made drainage systems – drainage basins which naturally drain, storm water drains along the roads and a new phenomenon of combined sewer cum storm water drains created as a bypass arrangement for blockage sewer lines.  It is this that has resulted in polluting the storm water drainage system.  As a result, the nullahs which used to run with rain water during monsoons now carry only sewage.

What is also being done, using Common Wealth Games as a shield, is to cover up the nullahs.  Now, this is really like putting dirt under the carpet.  This reminds me of a fable, in which, when a rabbit is confronted by pointing a gun at it, all it does is to cover its eyes with its ears.  The rabbit thus thinks that the threat no longer exists, but, it gets shot in any case! When you hide the threat you don’t necessarily solve the problem you only ignore it … until it becomes bigger.  Even if some sewage was reaching the nullahs, the rain water used to ensure that the viscous or solid waste content was appropriately diluted and thus the effluent reaching the river would not be as heavily polluted as it is today.

When residents cover or even fill up the storm water drains outside their houses to help park their cars or when the sarkari sweepers (employed by the municipality) also dump garbage into the open drains, it prevents rain water from reaching the nullahs and ultimately the river.  Blocking a drain should be treated as cognizable offence, because it is equivalent to sabotaging a public utility on which tax payers money has been spent. Historically it is said that the drainage system of Old Delhi was largely developed by the Mughals whereas of New Delhi by the British. It used to work fine until it was vandalized by us humans.

Often non working of a system is used as an excuse to reinvest in a new system which involves public expenditure. For example, a recent report tabled by the Committee on Petitions, Legislative Assembly of Delhi, while hearing a petition filed by a Delhi-based NGO, CHETNA, has highlighted the fact that the majority of the drains of Delhi have been settled and nothing can be done about it. It has also brought out the fact that in many cases even the design of the drains is faulty. The report suggests an urgent need for reconstructing the drains.

The other finding of the Committee, regarding resuscitation of the existing system makes interesting reading. While criticising the municipal authorities for indulging in cosmetic de-silting of drains, the Committee has observed that tenders were issued with the condition that payment would be released on the basis of actual quantity of silt removed. As a result, the contractors remove only just as much silt as is easily removable and leave the difficult and hardened part of it alone. According to the committee the tender document should clearly specify that the contractor’s payment will be released only after the bed level for each drain is achieved, for which work has been awarded to a given contractor. The bidder should be aware that he is not going to be paid for cosmetic exercise but actual de-silting which includes the stubborn silt. Moreover, the process of de-silting should be backwards from the outfalls towards colony drains. De-silting would of course be useful only when waste water actually finds its discharge into the outfalls.

The last Master Plan for storm water drainage of Delhi was prepared by the Master Plan Organization set up by the Irrigation and Flood Control Department during the period 1972-1976 (finalized in 1977). An Expert Committee was set up by the Delhi Administration to give guidance to this activity. This Master Plan took into account the urbanization limits up to the year 1981. However, while according approval, the Committee of Experts suggested that a fresh review of the drainage issues be taken while doing the Master Plan – 2021. Till date the Master Plan for storm water drainage of Delhi has not been revised.

The existing capacity of the sewage treatment plants in Delhi is under utilized due to of deficiency in the collection system and choking of existing sewerage, failure of pump connections and trunk sewers, internal sewers and peripheral sewers. The trunk sewers are 136 kms long and are heavily silted. The large network of (6000 km) peripheral sewers is very old and some of them are under sized and also in damaged condition. Central Pollution Control Board (CPCB) carried out inspection and monitoring of sewage treatment plants (STPs) in Delhi to verify the utilization of sewage treatment capacity and their performance during November-December 2003. They concluded that out of 3267 mld of sewage generated, treatment capacity exists for 2330 mld (71%), and actual treatment is given to only about 1478 mld which is just 45% of total sewage generated. Part of the wastewater generated is collected through underground sewers and transported to the treatment plants and balance flows into the river Yamuna through 22 drains. There are total 28 industrial estates in and around Delhi which contribute 218 mld wastewater (either treated or untreated) in to the open drains.

One also recalls that there used to be sewerage farms along with the river Yamuna where the sewerage system was providing water and nutrients to the crops and therefore the water reaching the river was cleaner.  Now if you travel along Mathura Road in Delhi you will find that the sewage farms have been sold off for development of Malls and other concrete structure.  The net result is that Yamuna itself has started looking and smelling like sewage canal.  Instead of cleaning the river is it not better to clean the effluent entering the river.  If the source of the problem is not tackled, it matters little how much money you pump into the river, you just cannot pump out the sewage.

Another interesting phenomenon, prevalent not only in Delhi but in most cities, is, that garbage is always dumped near the river.  Therefore, when the rains come, that garbage too finds its way into the river.  Now the river in Delhi does not spring out at the city itself but comes down from the Himalayas collecting water and effluent along the way.  For the river to flow smoothly, the unobstructed route through which it flows ensures how much water can pass.  Silting of course reduces the depth and the width of the river. But the problem is compounded by man. The tragedy of Yamuna is that when the city was faced with constraints of space, the authorities that be, allowed construction in the river bed, thus reducing the cross section of the river and creating the situation for future disaster.

Earlier in the river bed, during the non monsoon period, agricultural farming used to take place. This was in no way harmful; because when the rivers ran full during the monsoons; it used to leave a coat of fertile silt on the farm beds and the greenery thus grown also acted as a lung for the city.  Now, the infrastructure developments on the river front, with Akshardham temple and games village coming up, will encourage others to encroach into the river and ultimately destroy the hydrological cycle of the city.


August 4, 2010

copyright Manohar Khushalani and UnoUniverse.com



  • Irrigation Practice and Design, (Volumes I, II,III, IV & V) K.B. Khushalani & Manohar Khushalani Pub; Oxford & IBH (Sponsored by National Book Trust)
  • Control of Urban Pollution Series:CUPS/ / 2003-2004, CPCB
  • City Development Plan , Department of Urban Development, Govt. of Delhi / IL&FS/October 2006,

Manohar Khushalani

Prof. Manohar Khushalani is a former Visiting Faculty at Indraprastha Institute of Information Technology, Delhi. The courses he taught were: Animation & Graphics, Non-Linear Editing for Film and Radio and Theatre Appreciation.  He has won a total of nine Excellence in Teaching awards for all the courses he has taught at IIITD Earlier he retired from Government of India as Director Environment Management, Central Water Commission and held many senior positions in the Government Based on a Belief that Culture and Environment are the two keys to global sustainability , Manohar Khushalani has launched two portals: A Portal on Environment and Water called One Vorld at url: www.onevorld.org and two Ezines on Culture called Stage Buzz at url: www.stagebuzz.org He has taught extensively in varied subjects such as Dam Safety, Instrumentation, CAD, IT, Animation, Theatre, Newspaper Editing. He has conducted Courses on Environment Management, Water Shed Development, Team Building and Personality Development. He is an Expert Member of Prasar Bharti’s Committee for Grading & Short listing Films for Telecast on all channels of Doordarshan.  He is a Radio Anchor for All India Radio and has moderated several programs for the Rajdhani Channel He is a well-known Theatre Actor/Director and Critic, has been involved in theatre since 1977. He has worked as an actor in over 50 plays with almost every leading director/Actor in the Country including Badal Sircar, Feisal Alkazi, Amal Allana, M.K. Raina, Anuradha Kapoor, Maya Rao, Manohar Singh, Prasanna, Rati Bartholomew and Sushmita Mukherji. He has been active in the social sector as a street theatre activist. As a member of Workshop Theatre, Theatre Union and Prayog, Khushalani has participated in street plays taking up major social issues such as dowry, bride burning, Sati, banned medicinal drugs and communalism. Dario Fo’s Accidental Death of an Anarchist and Can’t Pay Won’t Pay, both directed by him, received rave notices from critics and audiences alike. Other plays directed by him include Badal Sircar’s, Sagina Mahato and Boris Vian’s Empire Builders for Ruchika Theatre Group. Khushalani has also acted in a few films such as Sudhir Mishra's Hazaron Khwaishen Aisi , Shoojit Sircar’s Madras Café and Pradeep Krishan's Annie Gives Those Ones. He is an Animator & Graphics Designer and has directed a number of documentaries. He also held a number of Honorary positions and was President of North India Films Association, He was the Chairman of  Jury for UGC CEC Educational Films Competition and has been on their Preview Committee since last many years. He was on the preview committee of Door Darshan Channel 3, was a visiting Professor at National School of Drama, New Delhi, and Film & Television Institute of India, Pune, AJKMCRR, Jamia Milia Islamia and Professor in Media at FICT, Delhi  He has judged a large number of Drama Competitions and conducted a number of Theatre / Management Games Workshops with Institutions such as AIIMS, NTPC, CWPRS, NWA, Karve Nari Prakshishan Sansthan, FICT, IIT, MAMC, Gargi College, KNC, Tagore International School and Vivekananda School. He is a Theatre Critic for IIC Diary, has also been a Columnist with Midday and Pioneer Daily and wrote Column's Called Culture Cocktail and Footlights Respectively. He was also the Guest Editor for an issue on Folk Theatre of ICCR Journal Horizons. He has written for Times of Indian, Hindustan Times, Blitz, Hard News, Hindu Business Line, Theatre India & Art Times. He has designed dams and hydraulic structures for the Government. He is a programmer and has developed Engineering design software in Fortran. He is a co-author of Irrigation Practice & Design (Vol 1 to5 - 1500 pages) published by Oxford & IBH and sponsored by National Book Trust. He has been a Director, Environment and Sociology, at the National Water Academy, Khadakwasla and Director, Environment Management Directorate, Central Water Commission and Member Secretary, National Environmental Monitoring Committee for River Valley Projects. He was also Director of Instrumentation Directorate in the Dam Safety Organisation. He was Chief General Manager and Head of Water Resources at Scott Wilson and is an accredited consultant with numerous other organizations He is a Delhi Public School, BITS Pilani, IIT Delhi and FTI Pune Alumini. He was also the President of BITS Pilani Alumni Association, Pune.

You may also like...