摘要:

In this letter, White comments that the conclusions reported by Ram and Malley in “Chlorine Residual Monitoring in the Presence of Norganic Compounds” (Journal AWWA, September 1984) may be misleading to operators at wastewater or reclaimed water plants. Ram responds that the study was designed to evaluate the monitoring of free available chlorine residuals in drinking water rather than wastewater or reclaimed wastewater.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05429.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

This article discusses future technological advances in water utility management and reviews technological advances that have affected management of the Denver Water Board in Denver, Colorado. Topics addressed include computerized budgeting and accounting, satellite monitoring of streamflow and snowpack data from remote locations that aids in planning, and computerized engineering applications, plant operations, and office systems.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05432.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

For purposes of determining the recoverable rates of a public utility, “operating expenses” can include prudently incurred rate‐case expenses, a Pennsylvania appellate court ruled.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05435.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

This panel discussed the parameters of safe drinking water at AWWA's annual conference in Dallas on June 13, 1984. Fred Elwell, chairman of the Water Utility Council and director and chief engineer of the Manchester, N.H., Water Works, served as moderator of the discussion. Participants were: Jean Auer, water director of the San Francisco Bay Area League of Women Voters; Foster S. Burba, president of the Louisville, Ky., Water Company; John Doull, professor of pharmacology and toxicology, University of Kansas Medical Center, Kansas City, Kan.; William C. Ford, director of the Public Water Program, Missouri Department of Natural Resources, Jefferson City, Mo.; and Victor Kimm, director of the Office of Drinking Water, US Environmental Protection Agency, Washington, D.C.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05437.x

出版商:Wiley    

年代:1984

数据来源: WILEY

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05438.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

Revised primary drinking water regulations are being developed by the US Environmental Protection Agency in response to the requirements of the Safe Drinking Water Act. National Interim Primary Drinking Water Regulations were established in 1975 with amendments in 1976, 1979, and 1980 for organic and inorganic chemicals, radionuclides, and microbiological contaminants. Development of the revised regulations will involve a comprehensive reassessment of the interim regulations and an examination of the experience gained from implementation of those regulations. This article describes these experiences and current considerations being evaluated for incorporation into the revised regulations.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05439.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

The principles and causes of water hammer are reviewed as a reminder that engineers, operators, and managers of water systems should have at least an intuitive understanding of this hydraulic phenomenon. Potential water hammer problems should be considered when any pipeline design is evaluated, and a thorough surge analysis should be undertaken in many instances to avoid costly malfunctions in a distribution system. The phenomenon of water hammer has not been widely understood, and this disregard cannot be considered good design practice.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05440.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

A description of the causes of postprecipitation is followed by a discussion of the effects of the phenomenon on distribution pipelines. In severe cases, the carrying capacity of mains can be reduced by half or water quality at the tap can be adversely affected, causing customer complaints. Since postprecipitation occurs often, operators should be aware of problems that exist and take preventive action through altering treatment practices. Distribution systems should be sampled periodically to determine if problems are present.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05441.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

The 114‐year‐old Kalamazoo, Mich., water utility has an accumulation of distribution system records, some of which were developed informally in the late 1800s from memory and continue to supply needed information. The utility now has a comprehensive record‐keeping system that is undergoing a transition from manually maintained index cards to computerized systems. Operator training must accompany the development of computerized record‐keeping systems if the new technology is to achieve its intended goal.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05442.x

出版商:Wiley    

年代:1984

数据来源: WILEY

摘要:

A study of stresses induced in ductile‐iron pipe by saddle supports is described in this article. Experimental data on strain were used to determine the distribution of stress in the vicinity of the saddle. Results indicate that the optimum saddle angle is in the range of 90–120 degrees. The maximum localized stress for pipe with R/t values ≥ 28 can be approximated by the formulaσ= k (P/t2) In (R/t), where k = 0.03 ‐ 0.00017 (β‐ 90) andβis the saddle angle in degrees.

ISSN:0003-150X    

DOI:10.1002/j.1551-8833.1984.tb05443.x

出版商:Wiley    

年代:1984

数据来源: WILEY