Piezometric error derived from some demand lumped models in water distribution

Abstract

Allocation of the internal demand in a line to the end nodes of the line may help reduce the size of the mathematical model of a water distribution network (WDN). Such a reduction is desirable as it allows hydraulic simulations at a lower computational cost. Moreover, this reduction is inevitable in the case of WDN models of large cities, due to its size, which require huge amounts of computational resources. However, such simplified models are not at zero cost, since they produce various errors in the calculations. In this contribution we provide a calculation mechanism that allows the engineers responsible for the hydraulic model of a WDN to know the errors in terms of piezometric head produced by allocating the internal demands of a line to the end nodes of the line.