Economic Design of Combined Gravity and Pumped Water Transmission Main

International Journal of Civil Engineering

© 2025 by SSRG - IJCE Journal

Volume 12 Issue 3

Year of Publication : 2025

Authors : Madhulika Sargaonkar, Laxmi Gangwani, Satyam Tiwari, Nikita Palod, Rajesh Gupta

10.14445/23488352/IJCE-V12I3P116

How to Cite?

Madhulika Sargaonkar, Laxmi Gangwani, Satyam Tiwari, Nikita Palod, Rajesh Gupta, "Economic Design of Combined Gravity and Pumped Water Transmission Main," SSRG International Journal of Civil Engineering, vol. 12,  no. 3, pp. 176-184, 2025. Crossref, https://doi.org/10.14445/23488352/IJCE-V12I3P116

Abstract:

A water transmission system is designed to supply treated water from the Water Treatment Plant (WTP) to the storage reservoirs located in the city's different zones in urban areas or different villages in a grouped water supply scheme. In the case of a grouped water supply scheme, the cost of the transmission network is quite high as the villages are generally located far from each other. Such a transmission system is planned as a direct pumping or a combined gravity and pumped type system. Recently, in the CPHEEO Manual, a methodology for the economic design of such systems is suggested that involves minimizing the cost of pipes, cost of pumps, Master Balancing Reservoir (MBR) cost (if required), and capitalized energy cost. A Linear Programming (LP) based model is suggested to design the network. The LP model provides two pipe sizes for some of the links, which is sometimes not favored by field engineers. Herein, a methodology based on a single pipe size for each link called the Modified Marginal Cost Increase Head Gain Ratio (MMCH) method, is suggested. The present work focuses on developing software using Python code. Initially, it is tested with a single-source, single-destination pumped transmission main, which is used to pump water from the sump of a WTP to MBR. Later, an economic analysis of a combined gravity and pumped transmission network is considered. The example network from the manual is considered, and it is observed that the overall difference in cost is 1.04 % when each link consists of a single size in the transmission network.

Keywords:

Transmission system, Pumped transmission main, MMCH method.

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