open channel flow Articles | Environmental XPRT

Open Channel Flow - The use of Level sensors for open channel flow measurement

Open Channel Flow - The use of Level sensors for open channel flow measurement Level sensors from SolidAT are implemented in Open Channel Flow applications. In these types of applications, the level sensor is installed above a special water flow structure and accurately measures level of flowing water or wastewater. The sensor then calculates flow through the structure ...

Jun. 27, 2012

By Solid Applied Technologies Ltd. (SolidAT)

Prediction of flow resistance in a compound open channel

Flooding in a river is a complex phenomenon which affects the livelihood and economic condition of the region. During flooding flow overtops the river course and spreads around the flood plain resulting in a two-course compound channel. It has been observed that the flow velocity in the flood plain is slower than that in the actual river course. This can produce a large shear layer between ...

Jan. 20, 2014

By IWA Publishing

Case study - Flowmeter troubleshooting at the township of North Glengarry - Case Study

The Problem... The forcemain meter at the pump station read five times higher than the open channel flowmeter at the lagoon 2 km away. The Township needed to determine which of the two flow meters was reading incorrectly. Troubleshooting Forcemain Flow... First step was to evaluate performance of the 12” magmeter at the sewage pump station. The cost ...

Sep. 8, 2011

By Greyline Instruments Inc.

Analyzing the turbulent flow on steep open channels

In channels with steep slopes, the flow is supercritical and the formation of roll waves is expected. In order to evaluate the flow behaviors in steep open channels, the Azad dam spillway is simulated numerically and its flow characteristics are compared with the physical model tests. In this study, the hydraulic variables including hydraulic depth and water surface profile are studied along ...

Mar. 21, 2016

By IWA Publishing

ANFIS-based approach for the estimation of transverse mixing coefficient

Understanding of the fate of pollutants, disposed of in streams, is a matter of concern in recent years for the effective control of pollution. Transverse mixing of the pollutants in open channels is arguably more important than the longitudinal mixing and near-field mixing. Several attempts have been made to establish the relationship between the transverse mixing coefficient and bulk channel ...

Feb. 28, 2011

By IWA Publishing

Prediction of end-depth ratio in open channels using genetic programming

In this paper, genetic programming (GP) is used as an effective model induction tool to solve a classic problem in open channel flow: the free overfall. By applying GP to experimental data of circular channels with a flat bed and employing a model selection procedure, a reliable expression in the form of hc = AheeBvs0 is found for calculating the critical depth (hc) and end-depth ratio (EDR). ...

Dec. 31, 2010

By IWA Publishing

Open Channel Flow Monitors retired after 16 years continuous service - Case Study

Long Sault WWTP Influent Flow Monitors Greyline Open Channel Flow Monitors were installed at the Wastewater Treatment Plant in Long Sault, Ontario when the SBR plant was originally commissioned in 1995. But after 16 years of continuous service, components for the old models became obsolete. Plant operators Caneau Water and Sewage Inc. decided to replace the instruments and new Greyline OCF ...

Aug. 10, 2017

By Greyline Instruments Inc.

Improving flow distribution in influent channels using computational fluid dynamics

Although the flow distribution in an influent channel where the inflow is split into each treatment process in a wastewater treatment plant greatly affects the efficiency of the process, and a weir is the typical structure for the flow distribution, to the authors' knowledge, there is a paucity of research on the flow distribution in an open channel with a weir. In this study, the influent ...

Aug. 3, 2016

By IWA Publishing

Closed vessel or open channel UV disinfection systems

Ultra violet disinfection is now a standard feature in most waste water disinfection systems. UV has also been adopted by the drinking water community, as a barrier against the chlorine tolerant species such as Cryptosporidium and Giardia. The technology is widely favored due to its non- chemical nature, the fact that no subsequent de-chlorination process is required, and its ability to be ...

Dec. 31, 2010

By atg UV Technology

What is Cross Flow Velocity?

Q: What is Cross Flow Velocity? A: Cross flow velocity (CFV) is the linear velocity of the flow tangential to the membrane surface and is reported in [m/sec] or [ft/sec]. CFV affects fouling rate and formation of concentration polarization at membrane surface and is calculated by dividing the volumetric flow rate [lpm or ...

May 25, 2017

By Sterlitech Corporation

GP approach for critical submergence of intakes in open channel flows

This technical paper presents the genetic programming (GP) approach to predict the critical submergence for horizontal intakes in open channel flow for different bottom clearances. Laboratory data from the literature for the critical submergence for a wide range of flow conditions were used for the development and testing of the proposed method. Froude number, Reynolds number, Weber number and ...

Sep. 24, 2012

By IWA Publishing

OCF 5.0 open channel flow monitors - monitor infulent at Long Sault WWTP plant - Case Study

Greyline Open Channel Flow Monitors were installed at the Wastewater Treatment Plant in Long Sault, Ontario when the SBR plant was originally commissioned in 1995. But after 16 years of continuous service, components for the old models became obsolete. Plant operators Caneau Water and Sewage Inc. decided to replace the instruments and new Greyline OCF 5.0 Open Channel Flow Monitors were installed ...

Sep. 8, 2011

By Greyline Instruments Inc.

Optimization of water distribution for open-channel irrigation networks

Water distribution for open-channel irrigation networks is more and more complex due to increasing constraints on water resources and changing demand patterns, whereas the performance of such systems is expected to increase. In this regard, an optimization approach is developed in order to schedule a fair scenario of water distribution among different users, where water demand is formulated in ...

Mar. 25, 2014

By IWA Publishing

Application of entropic approach to estimate the mean flow velocity and Manning roughness coefficient in a high-curvature flume

The entropy-based approach allows the estimation of the mean flow velocity in open channel flow by using the maximum flow velocity. The linear relationship between the mean velocity, umax, and the mean flow velocity, um, through the dimensionless parameter Φ(M), has been verified both in natural rivers and in laboratory channels. Recently, the authors of ...

Dec. 4, 2016

By IWA Publishing

Ayalon concrete channel, Tel-Aviv, Israel - Case Study

In Israel, the long, dry summer is followed by a short rainy winter season causing high-flow, high-velocity streams and flooding often occurs. Serving as the divider for the north and south lanes of the Tel-Aviv Freeway, the Ayalon channel was designed to handle the surging waters of the Ayalon River during Tel-Aviv’s winter rainy season. Since the channel's original design, the city has ...

Jun. 9, 2009

By Presto Geosystems

Accurate management of waste water flow case study

SmartScan 50O provides an accurate ultrasonic solution for flow measurement of waste water in a nation-wide advanced treatment plant. This wastewater treatment plant is located just outside a pop. 1 Million City. The plant provides wastewater treatment services for the municipality since 1999. The plant utilizes the latest technology of wastewater treatment that enables purification of ...

Jan. 11, 2012

By Solid Applied Technologies Ltd. (SolidAT)

Kinematic wave computation using an efficient implicit method

The kinematic wave theorem is the simplest and widely employed distributed routing method used in practical applications for the computation of flood wave propagation in overland and open-channel flows with steep topography. In this paper, an efficient finite-difference implicit MacCormack scheme is developed for the simulation of one-dimensional kinematic wave flows. Simulated results are ...

Jun. 30, 2010

By IWA Publishing

Effective monitoring improves sewage flow management case study

SmartScan 50 introduces an effective solution for flow measurement of sewage water in one of Poland's municipal waste water treatment plant. The city of Zblewo, Poland provides waste water treatment services to its inhabitants. The plant sought an ultrasonic measurement solution for monitoring the raw sewage flow during the treatment process. The problems When entering the ...

Jan. 5, 2003

By Solid Applied Technologies Ltd. (SolidAT)

Computational modeling of ultraviolet disinfection

The efficient design of ultraviolet light (UV) systems for water and wastewater treatment requires detailed knowledge of the patterns of fluid motion that occur in the disinfection channel. This knowledge is increasingly being obtained using Computational Fluid Dynamics (CFD) software packages that solve the equations governing turbulent fluid-flow motion. In this work, we present predictions of ...

Sep. 30, 2010

By IWA Publishing

Longitudinal dispersion in open channel flow with suspended canopies

Suspended canopies can cause flow disturbances such as reducing velocities within the canopy, and increasing flow beneath the canopy. Flow modifications by canopies dramatically affect the fate and transport of sediment, nutrients, contaminants, dissolved oxygen, and fauna in aquatic systems. A three-zone model is presented here to predict the longitudinal dispersion coefficient by simplifying ...

Jun. 5, 2016

By IWA Publishing

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