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Exploration of Pressure Driven Method in Hydraulic Modelling of Water Distribution Network

Abstract: A water supply network is assessed on its efficiency and capability to cater to the demand of consumers. There are two approaches for analysing a network viz. Demand Driven Approach (DDA) & Pressure Driven Approach (PDA). It assumes that the demands at all nodes are always satisfied, irrespective of the available nodal pressure. But many a times, in an operational network, certain situations such as pipe burst, pump failure, fire demand, supply shortage etc. arise. These situations cause pressure deficiency or even negative pressures. Such lower pressures cause water shortage at delivery points or sometimes even supply disruption. This is where DDA fails. PDA is comparatively a new approach. But it is capable of simulating pressure deficient conditions and analysing their effects on the network. Though, not for designing, but it can be efficiently used to simulate different conditions, analyse their effects and determine solutions to mitigate hazards. This paper compares DDA & PDA by analysing a looped network.