Bøger udgivet af American Water Works Association,US

Manual M73, Groundwater Management, is the culmination of efforts by members of AWWA's Groundwater Resource Committee to identify and demonstrate the value of using computer modeling tools to help utilities better manage their groundwater resources in light of greater competition for water and dwindling supplies in many parts of the world. In North America, we see acute issues developing in the Plains states, Rocky Mountains, desert Southwest, and even along parts of the Eastern Seaboard. In many of these cases, deep and often confined aquifers are being tapped for irrigation and potable supplies, but there is little hope these aquifers can recover their supplies in our lifetime. That creates the potential for serious economic and social consequences later in the 21st century for communities whose wells may run dry and have no backup options. To this end, this manual includes a discussion on the sustainability of groundwater supplies; overdrafting; and the need for groundwater protection, planning, and evaluation efforts that have evolved in the past 10 years. While groundwater management was incorporated to a small degree in the 2014 version of M21, Groundwater, the committee felt the topic has developed considerably over the past 10 years and that a more detailed and focused manual for groundwater management was timely. M21 will now focus primarily on operations.

Contents include the importance of gas transfer operations in water treatment including a definition of aeration; the physical mechanism of gas transfer, including Henry's Law Constants and information regarding blower selection; the principles and applications for gas addition; and the principles and applications for gas removal.

This manual provides comprehensive global guidance providing the relevant information required to develop a Climate Action Plan (CAP).

Pass your wastewater certification exam the first time! This study guide is specially developed to give wastewater operators practice answering questions that are similar in format and content to the questions that appear on certification exams.

This manual describes the design, specification,installation, and maintenance of polyethylene (PE) water pipe.

Make sound salary decisions for your utility. Compare your utility's salaries to those of similar utilities by filtering data. Reference salary range minimum, mid-point, and maximum levels for each position as well as 50th percentile, company-weighted average pay, and employee-weighted average pay.

Make sound salary decisions for your utility. Compare your utility's salaries to those of similar utilities by filtering data. Reference salary range minimum, mid-point, and maximum levels for each position as well as 50th percentile, company-weighted average pay, and employee-weighted average pay.

Make sound salary decisions for your utility. Compare your utility's salaries to those of similar utilities by filtering data. Reference salary range minimum, mid-point, and maximum levels for each position as well as 50th percentile, company-weighted average pay, and employee-weighted average pay.

This manual provides distribution engineers and operators with information on developing and using computer hydraulic models of water distribution systems.

Covers planning and designing distribution systems for treated, reclaimed, (nonpotable) water.

This manual will help water managers facing water shortages by illustrating how to employ tried-and-true strategies and tactics of drought mitigation, as well as new tools and methods.

This manual of practice covers public water utility management, designed for new managers, accountants, and supervisors.

Presents the history and general application of elastomers in waterworks pipes, valves, and fittings. The manual provides guidance on available elastomers and products and their application. The information presented is useful for operators, technicians, and engineers for gaining a basic understanding of the use and selection of elastomers.

This standard describes cold-water multijet meters in sizes 5/8 in. (15 mm) through 2 in. (50 mm) for water utilities' customer service and the materials and workmanship employed in their fabrication. These meters register by recording the revolutions of a rotor set in motion by the force of flowing water striking the blades.

Provides the minimum requirements for propeller-type meters for waterworks applications. This standard can be referenced when purchasing and receiving propeller-type meters for waterworks applications, and can be used for manufacturing this type of meter.

Provides the minimum requirements for cold-water meters-fire-service type. This standard can be referenced in specifications for purchasing and receiving cold-water meters-fire-service type and can be used for manufacturing this type of meter.

Reviews magnetic inductive flowmeter (magmeter) principles of operation, calibration, and selection. The performance and the reliability of these meters with no moving parts is discussed. The meters require less maintenance and are more accurate than mechanical meters in use today.

Defines the minimum requirements for the disinfection of water-storage facilities, including the preparation of water-storage facilities, application of chlorine, procedures for disinfecting underwater inspection and cleaning equipment, and testing for the presence of coliform bacteria, chlorine residual, and acceptable aesthetic water quality.

Prestressed concrete cylinder pipe is used principally in the transmission and distribution of water in municipal, industrial, and irrigation systems. It is also used in plant piping systems, seawater cooling systems, sewer force mains, and gravity sewers. Other applications include inverted siphons and liners for pressure tunnels.

Provides the minimum requirements for transit-time flowmeters, including components, performance, calibration, and verification. Transit-time flowmeters are used in a variety of applications, including raw water, treated water, and different stages of the treatment process, such as settled water, supernatant, backwash, and chemical lines.