Potable water is not available in plenty and is increasingly becoming scarce in nature. More energy is required to pump water across long distances and from deeper depth in the ground. This is an alarming situation, and the ever-increasing population burden on scarce water bodies is a warning to everybody to conserve and optimally use the available water resources.
The Government of Maharashtra (GOM), which provides grant-in-aid and stands guarantee for loans to Urban Local bodies (ULBs) in the state for water supply schemes, decided to undertake a close review of urban town water supply schemes on an emergency basis. The purview of these potable water supply schemes revealed an unsatisfactory situation. In most of these schemes, the expenditure was mainly on establishment and activities like operation & maintenance, and billing recovery.
Improvements to the existing system had not been done properly, resulting in heavy water losses due to water leakage, illegal connections, theft of water and loss of revenue.
Jalgaon Municipal Council called for tenders to conduct audit of its system, to gauge the present technical and commercial efficiency of the existing water supply system. This includes various sub-works, i.e., carrying out consumer surveys, water audit, energy audit, providing and installing flow meters, Geographic Information System (GIS) development & mapping, hydraulic modelling and computerised water billing & collection system for towns in the state.
For this project, ADCC provided high resolution satellite imagery (World View-2) for digital data extraction. A photogrammetric technique was used to extract digital data from high resolution satellite imageries for the development of JMC’s water supply system. Topographical details were obtained with hydrological features along with roads and railway networks.
Image procurement was done through NRSC, Hyderabad. World View-2 (0.6m colour resolution) Stereo-Pair was supplied and distributed by Digital Globe, Singapore.
Achieving the accuracies needed for quality GIS records from 1 to 2 meters up to a few centimetres requires differential correction of the data to improve accuracy. The collected GCPs through DGPS survey is used for geo-referencing the satellite imagery data by JMC. The tie-points pattern is used to clear the relative orientation error or parallax. This will create a relation between all the images, reducing the Y-Parallax and X-Parallax. Out of 109 tie-points including 20 GCPs collected, the RMSE (pixel) was 0.0017. ADCC introduced the ground control points i.e. Absolute Orientation. This orientation will refine images from orbit information to the real assigned co-ordinate system.
Meanwhile, a survey was carried out for property details. The activity of the property survey involved door-to-door survey, thus there was interaction possible with the property owners/tenants. The survey data helped JMC in hydraulic modelling, water audit, and demand supply analysis. Data such as ward-wise connection details as per consumer connection use and size was gathered. After updating the survey data, it was matched with JMC details.
As per the observation from the extensive water programme, the following works have been envisaged for improving the service levels to consumers of Jalgaon. The project was designed considering 30 years as the design period.
The improvement programmes are under three phases:
* Immediate stage (Year 2018)
* Intermediate stage (Year 2033)
* Ultimate stage (Year 2048)
The sustainability of existing components has been checked for the year 2018, and suitable rehabilitation or augmentation has been proposed in a phased manner in the intermediate phase (year 2018-2033) and the ultimate phase (year 2033-2048).