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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.

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.

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 user with both general and technical information to aid in design, procurement, installation, and maintenance of PVC pipe and fittings. Topics covered include general properties of polyvinyl chloride pipe; testing and inspection; hydraulics; and design factors related to external forces, internal pressure, and thrust.

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.

Provides technical information to aid utility managers and engineers in making informed decisions. The manual covers the benefits of condition assessment, how to plan for and build a condition assessment program, methods of condition assessment, strategies for economical assessments, and how information can be best used by utilities.

As desalination technologies advance and the availability of conventional freshwater sources decreases, inland water users are increasingly turning to desalination. This manual presents the key issues and challenges of developing inland desalination facilities, including concentrate management and disposal methods.

Presents a comprehensive description of the issues related to applying membrane technologies in water reuse projects.

Presents an all-hazards approach for principles, practices, and guidelines in water utility emergency planning.

Application, design, operation, control, and optimization of ozone facilities in drinking water treatment plants.

Explains pipe rehabilitation techniques, including cleaning, lining, and trenchless replacement.

Provides information about the most common large flowmeters used in water treatment and in custody-transfer applications.