Journal•ISSN: 0145-0743
Journal of the Water Resources Planning and Management Division
American Society of Civil Engineers
About: Journal of the Water Resources Planning and Management Division is an academic journal. The journal publishes majorly in the area(s): Water resources & Water supply. It has an ISSN identifier of 0145-0743. Over the lifetime, 174 publications have been published receiving 1628 citations.
Papers
More filters
TL;DR: In this paper, the economic implication of various replacement strategies and the effect of water quality (corrosivity) on water loss and system cost are examined. And a repair frequency analysis has been completed for distribution system maintenance events (leaks and breaks).
Abstract: Problems associated with maintaining and replacing water supply distribution systems are reviewed. Some of these problems are associated with public health, economic and spatial development of the community, and costs of repair and replacement of system components. A repair frequency analysis has been completed for distribution system maintenance events (leaks and breaks). The economic implication of various replacement strategies and the effect of water quality (corrosivity) on water loss and system cost are examined. This analysis is based on the data acquired from tne large (260 mgd; 11.39 m³/s) and one smaller (20 mgd; 0.88 m³/s) water utility. As this study shows, once a length of pipe begins to require maintenance, its maintenance rate increases exponentially. Maintenance costs soon exceed the costs of replacement. Therefore establishing a timely maintenance and replacement program is extremely important from an economic and public health viewpoint.
181 citations
TL;DR: A measure of the information transmission by the hydrologic network, in conjunction with spatial estimators, is derived using Shannon's information theory, which confirms that the network information transmission is dependent upon the joint entropy of the network station output but independent of the spatial estimations.
Abstract: A hydrologic data collection metwork is considered to be a component of a communication channel conveying regional hydrologic information. A measure of the information transmission by the hydrologic network, in conjunction with spatial estimators, is derived using Shannon's information theory. The resulting measure confirms that the network information transmission is dependent upon the joint entropy of the network station output but independent of the spatial estimators. Maximum information transmission is proposed as a criterion for the selection of station locations for a permanent network. A numerical example, involving the selection of station locations for various sizes of optimal information transmission hydrologic networks, is given.
105 citations
TL;DR: An optimization model has been developed for determining the minimum cost, size, and location of detention basins for urban watersheds and it can handle any arbitrary arrangement of candidate detention basin locations and sizes.
Abstract: An optimization model has been developed for determining the minimum cost, size, and location of detention basins for urban watersheds. This model is based on dynamic programming and can handle any arbitrary arrangement of candidate detention basin locations and sizes. The detention system representation uses the concept of iso-drainage lines. Flood routing procedures for channel routing and detention basin routing are incorporated into the dynamic programing model. An example application is given for illustration of the model.
59 citations
TL;DR: In this paper, the effects of metering, water-saving devices and price increases on residential water demand are explored for some typical communities, and secondary effects of conservation on revenue production and return flow are also discussed.
Abstract: Severe pressures on many urban water utilities are the result of water shortages, high treatment costs, scarce supplies and rapid growth. Various water-conservation techniques can be used to reduce the demand for water by urban customers. These include restrictions on use, installation of water-saving devices, metering, horticultural changes, pressure reduction, reuse, and public education. The effects of metering, water-saving devices and price increases on residential water demand are explored for some typical communities. Secondary effects of conservation on revenue production and return flow are also discussed.
50 citations
TL;DR: In this article, a simulation model of the reservoir system guided by an optimization method based on dynamic programing is presented for reservoir system planning and long-range operational studies, where the optimal solution is associated with minimum system operation cost for the planning period.
Abstract: A mathematical model is described that was developed as a tool for reservoir system planning studies and long-range operational studies. It consists of a simulation model of the reservoir system guided by an optimization method based on dynamic programing. The objective function represents total system operation cost. This function consists of the weighted sum of cost functions representing the major operating purposes of the system. The model determines end-of-week storage levels for 52 weeks or shorter planning periods for 19 storage reservoirs. The optimal solution is associated with minimum system operation cost for the planning period. The model is deterministic. It uses a set of power-system data and hydrologic data and finds the least cost solution for this input by considering the entire planning period. Specific operating constraints can be included. However, the model has the capability to find the minimum cost guided by the objective functions while it is constrained only by the design limits of the system.
50 citations