kumar Tyagi, Dharmendra, Mrinmoy Majumder, Chander Kant, and Ashish Prabhat Singh. 2018. “Estimation of Hazen williams’s Constant for a Residential Water Distribution Network; GMDH and PSO Approach”. International Journal of Engineering & Technology 7 (2.1): 92-99. https://doi.org/10.14419/ijet.v7i2.1.11051.