HYDRAULIC SIMULATION OF EXISTING WATER SUPPLY AND DISTRIBUTION NETWORK IN MINNA USING WaterGEMs MODEL

Abstract

A steady state simulation for the hydraulic parameters of existing Minna Water supply and distribution Network was carried out using water GEMs Model. With a total nodes of 459, 530 pipes and a length of 188 km after skelelotonization and accumulated fluid volume of 7,067m3 which represent 67% of total pipe network used for the simulation. The results revealed 4 pressure zones throughout the existing network, with single zone occupying 99.3% of the entire Network, with maximum pressure head of 588m, which causes more than 90% of the network to have a very low velocities of 0 -1.5m/s and as high as 6m/s. Suction pressure were detected at PAIDA and SHIRORO tanks as a result of higher pressure from direct line. Pressure head of over 50m were detected at Dutsen Kura Hausa, Government House and F-layout Areas. Poor networking, lack of proper urban planning and hydraulic design, unauthorized connection to the transmission lines, was identified as factors responsible for the existing poor distribution system. The water balance Method was used to estimates the NRW of 84% of Water loss. The study concluded by recommending zoning the system in to 5 Hydraulic DMAs (District metered areas), and Installation of Valves. Findings revealed that water GEMs Modelling approach is a promising alternative for the prediction of hydraulic parameters and optimal design of water distribution system. The study also recommend disconnection of all pipes on transmission lines, and to provide proper hydraulic design for newly developed areas to be served and Restrenghtening of the existing network.