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National Low Impact Development (LID) Atlas

This Low Impact Development (LID) Atlas was created for the National Nonpoint Education for Municipal Officials (NEMO) Network by the Connecticut NEMO program and the California Center for Water and Land Use to highlight innovative LID practices around the country. Its goal is to encourage and educate local officials and others about low impact development practices by providing specific, local examples of their use. The 31 member programs of the National NEMO Network have compiled the projects highlighted on this site and will continue to add new projects as they become available. Each project balloon contains project specifics, a summary of the project, photos (when available) and links to more information. Read More

Nonpoint Pollution for Municipal Officials (NEMO): Tools and Resources

Basic NEMO (Nonpoint source pollution Education for Municipal Officials) presentations, fact sheets, and soap box articles regarding the link between land use and water quality. NEMO has come to stand for outreach programs that provide resources that allow for good land use planning and site design that balances growth AND environmental protection. Read More

Comparison of Maintenance Cost, Labor Demands, and System Performance for LID and Conventional Stormwater Management

The perception of the maintenance demands of low impact development (LID) systems represents a significant barrier to the acceptance of LID technologies. Despite the increasing use of LID over the past two decades, stormwater managers still have minimal documentation in regard to the frequency, intensity, and costs associated with LID operations and maintenance. Due to increasing requirements for more effective treatment of runoff and the proliferation of total maximum daily load (TMDL) requirements, there is a greater need for more documented maintenance information for planning and implementation of stormwater control measures (SCMs). This study examined seven different types of SCMs for the first 2-4 years of operations and studied maintenance demands in the context of personnel hours, costs, and system pollutant removal. Read More

Treatment System Hydraulics

Library Holdings. Treatment System Hydraulics addresses the nuts-and-bolts of treatment systems, examining typical variables and describing methods for solving the problems faced by practitioners on a daily basis. The book begins with an introduction to treatment systems and hydraulics and explains the basic concepts of fluid properties, fluid statics, and fluid flow. Then Bergendahl discusses the factors that shape engineering decisions: friction in closed conduits, pumps and motors, granular media, valves, instrumentation, materials and corrosion, effects of transient conditions, and open channel flow. Each chapter presents fundamental concepts and applications in diverse situations, along with worked examples and problem sets. Suitable for undergraduate and graduate courses, Treatment System Hydraulics is also an useful reference for environmental, mechanical, civil, and chemical engineers designing or managing water treatment facilities. Read More

Guidelines for Quality Assurance of Installed Fine-Pore Aeration Equipment

Library Holdings. This EWRI/ASCE Standard guideline provides several techniques and guidance for use in developing quality assurance requirements for specifying fine-pore aeration equipment. Three methods for specifying compliance testing are described, including information on appropriate applications, advantages and disadvantages of each method, and the procedures to be followed. Two methods are based on conducting oxygen transfer shop tests, and the third is based on conducting full-scale oxygen transfer testing. The basis for compliance testing includes oxygen transfer testing of selected individual diffusers or two reference tests-dynamic wet pressure and effective flux ratio. A description of test procedures and diffuser sampling is included. Quality assurance benefits all parties involved in the manufacturing, specification, and use of aeration equipment by providing quality diffusers delivered at the site at a reasonable cost. Table of Contents 1. Scope 2. Summary of Method 3. Considerations for Quality Control Testing 4. Quality Assurance Compliance Testing Methods Read More

History of Drinking Water Treatment

Ancient civilizations established themselves around water sources. While the importance of ample water quantity for drinking and other purposes was apparent to our ancestors, an understanding of drinking water quality was not well known or documented. Although historical records have long mentioned aesthetic problems (an unpleasant appearance, taste or smell) with regard to drinking water, it took thousands of years for people to recognize that their senses alone were not accurate judges of water quality. Read More

Alternative Water Supplies and Treatments

Local incidents, such as spills and treatment problems, can lead to short-term needs for alternative water supplies or in-home water treatment. In isolated cases, individuals have needed to rely on alternative supplies for the long term because of their individual health needs or problems with obtaining new drinking water supplies. Read More

Solving our Water Problems

Now that we have established the need for something to guarantee our water quality, what are the alternatives? There are so many water systems being sold that it seems confusing. Let’s identify the various processes which are available to us and see what each one’s strengths and weaknesses are. Read More

Common Water Problems

Otherwise harmless contaminants like chlorine, sulfur, iron, and manganese that cause taste, color, and odor problems. Read More

Water Pollutants

The EPA released to the news media Dec.14, 1988 information that stated there is some kind of toxic substance in our ground water no matter where we live in the US! We have all heard some reference to problems resident in our drinking water in past decades. Even materials added to our drinking water to “protect” us (such as chlorine) are linked to certain cancers, and can form toxic compounds (THM’s) which adversely affect us. The old adage “If you want something done, do it yourself” applies to our drinking water also. Read More


EERL's mission is to be the best possible online collection of environmental and energy sustainability resources for community college educators and for their students. The resources are also available for practitioners and the public.


EERL is a product of a community college-based National Science Foundation Center, the Advanced Technology Environmental and Energy Center (ATEEC), and its partners.

Contact ATEEC 563.441.4087 or by email ateec@eicc.edu