Christensen S.,HDR |
Russo M.,Southern Nevada Water Authority |
Kodweis G.,Las Vegas Valley Water District |
Pipelines 2012: Innovations in Design, Construction, Operations, and Maintenance - Doing More with Less - Proceedings of the Pipelines 2012 Conference | Year: 2012
Southern Nevada receives 90% of its water supply from the Colorado River and Lake Mead, located 20 miles east of the Las Vegas Valley. To convey this water from Lake Mead to the Las Vegas Valley, a substantial infrastructure of pumping stations, water treatment facilities, laterals and metering stations is utilized. To ensure the reliability of water deliveries to member agencies, as well as the conveyance system itself, Southern Nevada Water Authority (SNWA or "Authority) has developed contingency and emergency plans to address unforeseen outages that might interfere with the conveyance of this water supply. In January 2011, a drill rig penetrated a large diameter lateral. Of course, the lateral was in the middle of major arterial (6 travel, 1 turning lanes) roadway, with businesses lining both sides of the street. With the emergency at hand, and once the utility owner was determined and notified, Southern Nevada Water Authority (SNWA) initiated their emergency plan and response. This paper will examine the preparation of SNWA's emergency plan, the plan implementation during the January 2011 interruption, and a "post mortem" examination of what parts of the plan worked, or didn't (and why) and how their iterative process helps the Authority better prepare for such incidents in the future. © 2012 American Society of Civil Engineering.
Solomon D.K.,University of Utah |
Cole E.,Las Vegas Valley Water District |
Leising J.F.,Molasky Corporate Center
Hydrogeology Journal | Year: 2011
The Las Vegas Valley Water District in Nevada, USA, has operated an artificial recharge (AR) program since 1989. In summer 2001, observations of gas exsolving from tap water prompted a study that revealed total dissolved gas (TDG) pressures approaching 2atm with a gas composition that it is predominantly air. Measurements of TDG pressure at well heads and in the distribution system indicated two potential mechanisms for elevated TDG pressures: (1) air entrainment during AR operations, and (2) temperature changes between the winter recharge season and the summer withdrawal season. Air entrainment during pumping was investigated by intentionally allowing the forebay (upstream reservoir) of a large pumping station to drawdown to the point of vortex formation. This resulted in up to a 0.7atm increase in TDG pressure. In general, the solubility of gases in water decreases as the temperature increases. In the Las Vegas Valley, water that acquired a modest amount of dissolved gas during winter artificial recharge operations experienced an increase in dissolved gas pressure (0.04atm/°C) as the water warmed in the subsurface. A combination of air entrainment during AR operations and its amplification by temperature increase after recharge can account for most of the observed amounts of excess gas at this site. © 2010 Springer-Verlag.
Kodweis G.,Las Vegas Valley Water District
Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability - Proceedings of the Pipelines 2014 Conference | Year: 2014
On July 1, 2013, a wildfire was started by a lightning strike in the Spring Mountains, located west of Las Vegas, Nevada. Two small water systems were affected by the fire, Trout Canyon and Kyle Canyon. The fire burned more than 27,800 acres and by July 15, 2013 the fire was 70% contained, allowing the evacuated residents to return to their homes. The fire was not 100% contained until September 17, 2013. The NvWARN system was activated to repair the Trout Canyon Water System utilizing materials from water systems throughout Nevada and crews from the Las Vegas Valley Water District. Repairs, from the fire damage, on the Trout Canyon Water System were completed on August 30, 2013. Heavy rains over the Labor Day weekend, dating from August 30, 2013 to September 2, 2013, caused massive debris flows that completely destroyed the Trout Canyon Water System and damaged the Kyle Canyon Water System. This paper describes the damage that occurred to both the water systems and shows more damage to water systems can occur after a forest fire than during the actual fire event. This paper also discusses how emergency agreements that are in place will assist smaller communities, but the smaller communities still need emergency plans and funding sources before a disaster occurs. Finally, the paper contrasts the damage to an upgraded modern water system versus an older system, showing how the modern system withstood the storm with less damage. © 2014 American Society of Civil Engineers.
Claassen D.,Las Vegas Valley Water District |
Ames M.,Chapman Engineering
Materials Performance | Year: 2015
In April 2013, the Las Vegas Valley Water District attempted to install a 500-ft (152-m) deep anode bed for an impressed current cathodic protection system. This depth was required to minimize stray current effects on nearby utilities. Before the anodes could be installed, ground water began fowing out of the top of the hole at ∼50 gal/min (189 L/m). This article describes the problems en countered and the solutions developed. © 2015, National Assocation of Corrosion Engineers International. All rights reserved.
Sun Y.,University of Cincinnati |
Tong S.T.Y.,University of Cincinnati |
Fang M.,Las Vegas Valley Water District |
Yang Y.J.,Office of Research and Development
Environment, Development and Sustainability | Year: 2013
The Las Vegas Valley metropolitan area is one of the fastest growing areas in the southwestern United States. The rapid urbanization has presented many environmental challenges. For instance, as population growth and urbanization continue, the supply of sufficient clean water will become a concern. In addition, the area is also experiencing the longest drought in history, and the volume of water storage in Lake Mead, the main fresh water supply for the entire region, has been reduced greatly. The water quality in the main stem of the Las Vegas Wash (LVW) and Lake Mead may also be significantly affected. In order to develop effective sustainable management plans, the very first step is to predict the plausible future urbanization and land use patterns. This paper presents an approach to predict the future land use pattern at the LVW watershed using a Markov cellular automata model. The multi-criteria evaluation was used to couple population density as a variable depicting the driving force of urbanization in the model. Moreover, landscape metrics were used to analyze land use changes in order to better understand the dynamics of urban development in the LVW watershed. The predicted future land use maps for the years 2030 and 2050 show substantial urban development in the area, much of which are located in areas sensitive to source water protections. The results of the analysis provide valuable information for local planners and policy makers, assisting their efforts in constructing alternative sustainable urban development schemes and environmental management strategies. © 2013 Springer Science+Business Media Dordrecht.