While analysing a real network, the assumption of zero minimum pressure head as the elevation of demand node may lead to unrealistic results as some residual pressure is necessary to derive any outflow at the node. A more realistic minimum pressure head plays an important role for analysis of an existing or proposed network. The present study extends a novel method of pressure-dependent volume driven-analysis by investigating the effects of realistic minimum pressure heads. The novelty of the proposed method is to evaluate the practical impact of the zero minimum pressure head assumption under pressure-deficient condition in water distribution networks considering pipe isolation, fire demand, and altering total reservoir heads. The results obtained from the present method are compared with the results based on the more optimistic traditional assumption of zero minimum residual pressure-head. It is observed that time to fill the storage tanks under both normal and pressure-deficient conditions for non-zero minimum pressure head is higher. All the simulations were performed using graphical user interface of EPANET 2. Thus, the proposed approach can be used readily by researchers and practitioners without requiring any additional computational codes development.

在分析实际网络时，将零最小压头作为需求节点的高度的假设可能会导致不切实际的结果，因为需要一些残余压力来导出节点上的任何流出量。更为现实的最小压力头对于分析现有或拟议的网络起着重要的作用。本研究通过研究实际最小压力头的影响，扩展了一种新的压力依赖体积驱动分析方法。所提出方法的新颖性是在考虑管道隔离，消防需求和改变总水头的情况下，评估供水网络中压力不足条件下零最小水头假设的实际影响。将本方法获得的结果与基于最小残留压头为零的更为乐观的传统假设的结果进行比较。可以看到，在正常和压力不足的情况下，非零最小压力扬程下填充储油罐的时间更长。所有仿真均使用EPANET 2图形用户界面进行。因此，研究人员和从业人员可以轻松使用所提出的方法，而无需开发任何其他计算代码。