PowerPoint Presentation

[Audio] Hi I am Dr Subhani, an Urban Infrastructure Designer working in designing of Water Supply and Under Ground Sewerage System Since 1998 that is more than Two Decades. This brief presentation is an outcome of hard effort of more than couple of years put by my colleagues to really say that the Shallow Depth Sewerage System is an alternate to Conventional Sewerage System. Before getting in to the technical aspects, our understanding of the present system is.

[Audio] India has More than 4000 ULBs More than 40 Crore Population is residing in these ULBs One lakh population is an average size of ULB Got about 800000 kilometres of road network in all ULBs Not less than 400000 kilometres are covered/paved with CC or BT Roads Not even 40000 kilometres are covered with under ground sewerage system till date.

[Audio] To meet Service Level Bench Marks that is SLBMs, there is no other option except digging these roads sometime or the other if UGS System is done with CONVENTIONAL SYSTEM To reconstruct of roads alone, it is going to cost about two lakh Crore alone for reconstruction of roads besides another three lakh crore required to lay sewer lines that is besides treatment facilities and O & M Cost. Will brief now how opting this shallow depth UGS is an advantage than the conventional system.

[Audio] Traditionally, sewerage system is designed for 80 percent of water supplied. Following ne manual, it is even more than 95 percent. Traditionally, sewer lines are laid in the middle of the road irrespective of whether these are lateral, sub mains or trunk mains. The sewage or sullage from households are connected to the manholes of sewerage system through Inspection Chambers which is constructed at property edge and the same will be connected with 100 or 150mm dia pipe lines to manhole which is called as house service connection. In the process of construction of sewer lines, manholes and house service connections, the entire road will be digged and there is no option except totally recarpeting of road to retain original status..

[Audio] Generally road will be digged in such a manner that hardly place is left for movement of public to reach their houses and they forced to park their vehicles at nearby unsecured place and with a great difficulty they reaches their houses. In general, the user is troubled for more than a week time that too if the agency is well performing one..

[Audio] and even after completion also the trouble continues. Even after relaying roads, this is how the status due to poor compaction. As a agency functioned as Independent Review and Monitoring Agency that is IRMA , we are observing this situation since a long time and the policy makers are almost taking a decision not to go for under ground sewerage system..

[Audio] If that is the case, the user is compelled to stay in the same unhygienic condition. The above picture in Nalgonda Municipality resembles the poor condition of drainage system in that area.This is the unhygienic situation in most of the colonies. With a special interest to create healthy infrastructure in sanitation sector, the Commissioner, Nalgonda has convinced members of municipal councils that is councilors, chairperson, MLA..

[Audio] To carry out a detailed study, the Commissioner has requested NCPE to come out with a highly economic, workable, maintenance free and least damage to the existing infrastructure and minimum disturbance to people of streets. This is how we came with this new proposal – that is No Digging of roads – Shallow Depth UGS . Now we will try to brief the technicalities of proposals and application of the same to identified zone in Nalgonda Municipality..

[Audio] It is worth while to mention here that, this system is very well suggested in new CPHEEO sewerage manual, but hardly efforts are put to bring to practice. It is in 2018, the Government of Andhra Pradesh has taken interest and successfully implemented in many areas and looking at comfort running only, we have proposed this system for Nalgonda Municipality. As suggested in manual, the lateral sewer lines will be constructed on both sides of the road ( parallel to the property line) and with a depth of 0.3 meters that is soffit level..

[Audio] The sewer lines itself will have inspection chambers and no need to go for traditional manholes. All lateral sewer lines can be done with this system and sub mains and trunk mains can be executed in traditional method. It is to mention here that the lateral lengths in any city ranges from 80 to 85 percent of total sewer network. That means minimum of 80 percent of sewer network can be constructed with half of the cost which is likely to incur in construction of lateral sewer lines in conventional method. On the above all, lot of ease to the user during construction and no major Now the details of Nalgonda Municipality.

[Audio] The Nalgonda Municipality is spread over an area of 105 square kilometres and is having about 2.25 lakh population at present. The drinking water is supplied @ 135 lpcd and water supply system is well established to meet requirement of prospective year that is 2037..

Upgradation of Infrastructure in Nalgonda – Under Ground Drainage Network.

Upgradation of Infrastructure in Nalgonda - Under Ground Drainage Network.

[Audio] A detailed exercise is done to understand the benefits of shallow depth UGS over conventional system. It is evident from the analysis that the monetary savings will be about 42% besides convenience in operation and maintenance of the system. On the above all, the inconvenience to the user is reduced to a large extent including hassle free shifting of existing services during execution of the system. Lets look at advantages at a glance.

[Audio] Low Capital Cost ; Minimum time required to construct ( takes less than 50 % of time required with conventional method) Minimum cost involved in Operation & Maintenance of the system No Digging of roads (laid all along property line only) Convenient to integrate with septic tanks / existing system On the above all, no inconvenience to the user Only the draw back is, it is not very convenient on heavy traffic roads – however, conventional system will be adopted for those streets..

[Audio] Thank You very much and hope to have shallow depth UGS in Urban Local Bodies of India in General and AMRUT Towns in particular..