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Stevens Point, CO, United States

Barnett T.C.,Innovyze | Venayagamoorthy S.K.,Colorado State University
Journal - American Water Works Association | Year: 2014

Transitions in flow regimes that can occur in drinking water contact tanks may significantly affect the disinfection efficiency of the system. To demonstrate these effects, the authors investigated the internal velocity fields and flow regime of a drinking water contact tank located in Jamestown, Colo. The baffling factor (BF) of the system fluctuated annually between 0.5 and 0.6 because of a shift in flow regime caused by changes in the flow rate of the system. The authors studied the effects of the regime change from laminar to turbulent flow (or vice versa) using computational fluid dynamics (CFD) models and physical tracer studies. Several inlet modifications were then investigated using CFD to determine which alteration would be most beneficial. Key findings showed that with proper inlet modification, the BF of the system could be stabilized at 0.6 during periods of high or low flow. 2014 © American Water Works Association

Huang X.,Innovyze | Niemann J.D.,Colorado State University
GSA Reviews in Engineering Geology | Year: 2014

Gullies are common features throughout the southwestern United States including Army training facilities such as the Piñon Canyon Maneuver Site. These gullies have depths up to several meters, which can restrict the mobility of troops and vehicles during training exercises. They also have the potential to grow in size, which can degrade training lands. At the upstream end, gullies usually begin with an abrupt headwall, and in the downstream direction, gullies also tend to terminate abruptly. In this paper, we hypothesize that the small extent of convective storms and significant transmission losses in channels promote the downstream disappearance of gullies. The role of these factors is tested by applying a geomorphic model in which storms occur within circular portions of the simulation domain and channel flow is lost to seepage up to a specified infiltration or seepage capacity in each grid cell. The net effect of these processes is to reduce the sediment transport capacity in the downstream direction relative to the case with an infinite storm size and no channel losses. The reduced sediment capacity alters the relationship between slope and drainage area for topographies at equilibrium. In addition, limited storm sizes can also produce disconnected areas of incision within generally depositional portions of the landscape. © 2014 The Geological Society of America. All rights reserved.

Harpham Q.,HR Wallingford | Pearce G.,HR Wallingford | von Christierson B.,HR Wallingford | Harper A.,Innovyze
Urban Water Management: Challenges and Oppurtunities - 11th International Conference on Computing and Control for the Water Industry, CCWI 2011 | Year: 2011

The paper describes the FluidEarth platform for integrated modelling. FluidEarth is a technical and managerial framework for integrated modelling utilising the OpenMI (Open Modelling Interface) standard. This standard was initially developed for use in the water domain but is finding applications in other fields. Following a brief description and motivation for OpenMI itself, the FluidEarth implementation is given: a technical framework comprising of a Software Development Kit and a GUI (Pipistrelle) and also a managerial framework including an internet portal and a catalogue of compliant models for use by the community of users and practitioners. An urban drainage case study (Oxford) is also briefly mentioned.

Filion Y.,Queens University | Jung B.S.,Innovyze
Urban Water Management: Challenges and Oppurtunities - 11th International Conference on Computing and Control for the Water Industry, CCWI 2011 | Year: 2011

Water distribution systems (WDSs) are designed and operated to consistently and economically deliver water from source to consumer in sufficient quantity, of acceptable quality, and at appropriate pressure. One important source of uncertainty in network design is in the estimation of needed fire flow. The paper offers a critical assessment and comparison of two previously developed risk-based methods that characterize uncertainty in fire flow and fire risk in the optimization of branched and looped water distribution networks. The first approach combines an analytical probabilistic model of fire risk with a non-dominated multi-objective genetic algorithm to size pipe diameters in branched water distribution networks. The second approach combines a quasi-analytical integration-based method to estimates fire damages with a Particle Swarm Optimization algorithm. The paper discusses the advantages and disadvantages and limitations and assumptions of each approach. Both approaches are demonstrated by way of case studies on branched and looped water networks.

Madin B.,GHD | Austin R.,Innovyze
BHR Group - 11th International Conferences on Pressure Surges | Year: 2012

Field test validation of pressure transient models is often confined to crude comparison of peak pressures, providing only a weak test of model performance and tending to foster use of the model as a 'black box' for predicting such pressures. Conversely, detailed comparison of model results with the dynamic behaviour observed during field tests can be of great value in improving both the model and the engineer's understanding of the system. This is illustrated by a case study of the correction and validation of a pressure transient model of a water transfer system located in Northern Queensland, Australia. ©BHR Group2012 Pressure Surges 11.

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