Application of GIS and Hydraulic Model for Energy Reduction-A Case study of Gravity Main of Hetwane Dam

摘要

Presently, 100 MLD water is supplied from the Hetwane dam to Navi-Mumbai. Water from the dam is supplied by gravity to the sump located at the foot-hill of the hillock, and then it is pumped to the Water Treatment Plant (WTP) located on the hillock. The size of the Prestressed Concrete Pipe (PSC) line is 1500 mm for a length of 11.90 km and 1200 mm for a length of 6.9 kms. Gravity main also supplies water to the 35 enroute villages. The objective of this case study to re-design the gravity main so that it can supply 150 MLD (50 MLD additional) water from the dam to WTP directly by gravity saving electric energy and the cost. The existing raw water gravity main is analyzed by most advanced technology of GIS and water network simulation technology of EPANET. This paper describes the GIS based hydraulic model which has been used to analyze the flow. The case study involves computation of the enroute village water consumption and head losses over the various tapping points on gravity main. This case study helps to know the Hydraulic gradient level and water pressure as respective village tapping point. Analysis made by the hydraulic model resulted into seven alternatives and ensures that 150 MLD water can be supplied by gravity after deepening of the pipeline in the two reaches. Thus using hydraulic model, CIDCO could save huge amount of pumping cost of raw water.