Computer Modeling of Water Distribution Systems by American Water Works Association

By American Water Works Association

Laptop versions of water distribution structures are instruments that experience advanced over the years to assist water approach designers, operators, and bosses carry secure, trustworthy water at inexpensive. This guide presents water pros the fundamentals of distribution process modeling, together with details on version training, method assessments and measurements, steady-state and extended-period simulations, and water caliber modeling. It additionally covers info assortment, version layout, calibration, and the various makes use of for distribution approach computing device versions.

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To calculate the node demand, first determine the consumption per area (gallons/acre) by dividing the remaining volume by the remaining area to be serviced. Each node is then Copyright (C) 2005 American Water Works Association All Rights Reserved PREPARING THE MODEL 31 assigned consumption values by multiplying its area by the calculated consumption per area value. Using additional information such as population counts and land use characteristics, further refines the process of allocating unmetered water loss within a zone.

The modeler will need to evaluate the modeling requirements, budget, and available data in order to select the most appropriate demand calculation and allocation method. Most hydraulic analysis programs assign the customer demand to the nearest node. Advances in the software and in GIS technologies allow assignment of demands directly to the applicable pipe, at an appropriate distance along the pipe. Allowing the steady state model to be adaptable to extended-time-period modeling, it is recommended that the input demands at each node be the average daily demands.

This map can be annotated with the locations of fire hydrants to be tested, temporary meter locations, areas with unlined pipe, and known problem areas. Some tests require valves to be closed or other operational changes, which are also noted on the map. Areas where flow or pressure monitors are placed are marked. When possible, it is often helpful to use pressure or flow monitoring points that are on the SCADA system to reduce the requirements for field monitoring equipment. All the parameters that need to be monitored are identified.

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