PREDICTING THE LOCATION AND DURATION OF TRANSIENT INDUCED LOW OR NEGATIVE PRESSURES WITHIN A LARGE WATER DISTRIBUTION SYSTEM

Surge modeling is a tool used by engineers and utility owners in determining the surge pressures or transients that may result from routine pump and valve operations. Recent surge modeling work has focused on low and/or negative pressures within water distribution systems and how those occurrences could lead to intrusions. Effective surge modeling is needed in order to determine if the intrusion potential exists and what mitigation is needed to prevent intrusions. This work focuses on the generally unexplored area of using surge models to predict the location and duration of transient induced low and/or negative pressures within large complex water distribution systems. The studied system serves 350,000 people in the southeast United States, has 65 MGD of pumping capacity at two treatment plants, over 1500 miles of main and 12 storage tanks. This work focuses on the correlation between field data and the surge model using the author\u27s extensive operational knowledge of the system, access to real-time SCADA data, and different celerity or wave speed values. This work also traces the steps taken by the author to locate areas within the system that experienced transient induced low and / or negative pressure

A commentary on recent water safety initiatives in the context of water utility risk management.

Over the last decade, suppliers of drinking water have recognised the limitations of relying solely on end-product monitoring to ensure safe water quality and have sought to reinforce their approach by adopting preventative strategies where risks are proactively identified, assessed and managed. This is leading to the development of water safety plans; structured ‘route maps’ for managing risks to water supply, from catchment to consumer taps. This paper reviews the Hazard Analysis and Critical Control Point (HACCP) procedure on which many water safety plans are based and considers its appropriateness in the context of drinking water risk management. We examine water safety plans in a broad context, looking at a variety of monitoring, optimisation and risk management initiatives that can be taken to improve drinking water safety. These are cross-compared using a simple framework that facilitates an integrated approach to water safety. Finally, we look at how risk management practices are being integrated across water companies and how this is likely to affect the future development of water safety p

Water Current, Volume 30, No. 2, April 1998

Blizzard Doesn\u27t Hamper Nebraska Water 2000 Conference From the Director: NIWR Meetings in Washington D.C.; Research Discussed; Summer Water Tour Of Boreholes, Bunyips and Boxing Day Water Stewards Receive Annual Awards at Water Conference in Kearney Summer Water Tour to Visit Arkansas and Republican River Basins in August AWWA Research Foundation RFPs Water News Briefs Wetlands ID Now Available How to Boost Your Golf Course Values EPA Restoration Website Community Outreach Kits Nebraska Range Shortcourse 1998 NIWR Executive Summary Available Free from N

Water Current, Volume 31, No. 2, April 1999

Defining Visions of Nebraska\u27s Water Future From the Director Jess, Harnsberger, Nebraska Plan Team Honored as Water Stewards at Kearney University of Nebraska Hires Jess Nebraska Forestry Shortcourse Managing Pesticides to Minimize Risk Water News Brief Free Drinking Water Week Packets AWWA Announces Research Project Funds TGF Memberships Nebraska Water Tou

Water Current, Volume 29, No. 4, August 1997

Fifth Annual Festival of Color Highlights Landscaping, Youth Activities Near Mead From the Director: Retirement, New Staff Welcomed, USGS Funds Nebraska Proposals Unicameral Moves Quickly on Changes to Instream Appropriations Process with LB877 Schulze One of Three Extension Staff Honored Native Plants Help Clean-Up Toxins Spalding Recognized for EPA Superfund Cleanup Technique Education and Action Join Forces Water News Briefs 42nd Annual Midwest Groundwater Conference Symposium Focused on Water Act and Groundwater Nineteen Attend Groundwater U Environment97 AWWA Research RFPs Ground Water Protection Council Annual Forum in Cleveland, Ohio National Drought Planning Center Headquarters at UN

Water Current, Volume 29, No. 4, August 1997

Fifth Annual Festival of Color Highlights Landscaping, Youth Activities Near Mead From the Director: Retirement, New Staff Welcomed, USGS Funds Nebraska Proposals Unicameral Moves Quickly on Changes to Instream Appropriations Process with LB877 Schulze One of Three Extension Staff Honored Native Plants Help Clean-Up Toxins Spalding Recognized for EPA Superfund Cleanup Technique Education and Action Join Forces Water News Briefs 42nd Annual Midwest Groundwater Conference Symposium Focused on Water Act and Groundwater Nineteen Attend Groundwater U Environment97 AWWA Research RFPs Ground Water Protection Council Annual Forum in Cleveland, Ohio National Drought Planning Center Headquarters at UN

Investigation of the Corrosion and Scaling Potentials of Raw and Treated Water and Its Effect on Concrete Tanks at Al-Tayyaraa Water Treatment Plant

تم إجراء هذه الدراسة لتقييم الامكانيات التآكلية وتكوين التكلس للمياه الخام والمعالجة  في محطة الطيارة لمعالجة المياه خلال فترة اثني عشر شهرا بدءا من يناير حتى ديسمبر 2016. تم النظر في ثلاثة مؤشرات للتآكل والقياس في هذه الدراسة بما في ذلك مؤشر ريزنار (Ryznar Index (RI))  ومؤشر لانجيلير للتشبع (Langelier Saturation Index (LSI)) والمؤشر العدواني (Aggressive Index (AI)). في هذا البحث تم قياس معاملات جودة المياه pH، Alk (Ca) ، درجة الحرارة، الكالسيوم متمثلا ﺒ (CaCO3)، و أخيرا المعامل TDS. واظهرت النتائج للمياه الخام ان قيم LSI  و RI  كانت على التوالي (0.14-0.504) و (0.03-0.4)  في حين كانت نتائج نفس المؤشرين للمياه المعالجة  هي (6.956 -7.62) و (7.02-7.7) على التوالي. وكانت نتائج المؤشر AI للمياه الخام والمياه المعالجة هي (11.77-12) و (11.67-11.948 ) على التوالي. وكشفت القيم المحسوبة  للمؤشر LSI أن المياه المعالجة والماء الخام كانت متوازنة أو ممكن تكون طبقة رقيقة جدا من الترسبات. أشارت قيم المؤشر RI إلى أن المياه الخام والمعالجة كانت مسببة للتآكل وأظهرت قيم المؤشر العدواني (AI) أن الماء كان  مسببا لتآكل معتدل وليس له تأثير واضح على الخزان الخرساني في محطات معالجة المياه.This study is conducted to evaluate corrosion and scaling potentials of raw and treated water at Al-Tayyaraa water treatment plant during a period of twelve months, starting from January to December 2016. Three indices of corrosion and scaling in this study are considered including Ryznar Index (RI), Langelier Saturation Index (LSI), and Aggressive Index (AI). Water quality parameters pH, Alk, (Ca), temperature, calcium as CaCO3, and (TDS) are measured. For raw water, the values of LSI and RI are (0.14-0.504) and (6.956 -7.62), respectively, whereas for treated water, the values of LSI and RI are (0.03-0.4) and (7.02-7.7), respectively. The values of AI are (11.77-12) for raw water and (11.67-11.948) for treated water. The calculated values of Langelier Saturation Index (LSI) reveal that the treated and raw water are balanced to some faint coating (light scale forming). The values of RI point that the raw and treated water are corrosive and values of aggressive index show that the water is moderate corrosion and no obvious effect on concrete tank at water treatment plants

Interagency Management Action Plan (I-MAP) for Quagga Mussels

Following the discovery of quagga mussels in Lake Mead, a variety of agencies, including National Park Service (NPS) Lake Mead National Recreational Area (LMNRA), Bureau of Reclamation (USBR), Southern Nevada Water Authority (SNWA), Nevada Department of Wildlife (NDOW), U.S. Fish and Wildlife (USFWS), Clean Water Coalition (CWC), and U.S. Geological Survey (USGS) have set up monitoring programs to evaluate and gain information to help minimize the impacts or potential impacts of quagga mussels to their facilities and lake ecology. Current monitoring activities and anticipated environmental impacts are depicted in Figures 1 and 2. While the agencies have worked closely and shared monitoring data and findings from the beginning of the infestation, there has been no documented comprehensive monitoring program to describe and record the various quagga mussel-related monitoring needs relative to interagency objectives for Lakes Mead and Mohave. Ad hoc interagency quagga mussel meetings attended by representatives of the above-listed agencies and others served as a springboard for gathering the information with which to establish this Interagency Monitoring Action Plan (I-MAP), which outlines agency objectives related to quagga mussel monitoring and provides approaches to realize these objectives. At the time of this document’s publication, the “I-MAP quagga mussel coordination team” included representatives from the following agencies: LMNRA, USBR, SNWA, NDOW, CWC, AZGFD, USFWS, MWD, UNLV, DRI, and UNR (Figure 3). I-MAP team members and their respective agencies provide technical, logistical, and financial support in monitoring quagga mussels and their environmental impacts to Lake Mead. The purpose of the I-MAP team is to coordinate monitoring relevant to the I-MAP