Discharge Monitoring Articles

  • Calculation method for steady-state pollutant concentration in mixing zones considering variable lateral diffusion coefficient

    Prediction of the pollutant mixing zone (PMZ) near the discharge outfall in Huangshaxi shows large error when using the methods based on the constant lateral diffusion assumption. The discrepancy is due to the lack of consideration of the diffusion coefficient variation. The variable lateral diffusion coefficient is proposed to be a function of the longitudinal distance from the outfall. ...


    By IWA Publishing

  • Case study - Discharge measurement at the river

    Due to the seasonally strong weed growth and low flow during low water periods the measurement of water level and flow at the measurement site "Kleinraschuetz“ was rather distorted. It had to be corrected by putting in additional manpower for manual measurements. Therefore it was decided to modernize the station completely and to install a stationary discharge measuring system. The ...


    By OTT HydroMet

  • Case study - Discharge measurement deep within a cave

    Research is currently being conducted in the Hessenhau cave, located in southern Germany. The cave is the deepest known within the Swabian Alps at 144m (472 ft) and has a stream running through it that connects it to other caves within the area. Discharge measurements were taken in different parts of the cave with the OTT MF pro electromagnetic current meter. Reaching the bottom of the cave ...


    By OTT HydroMet

  • Similarity, difference and correlation of meteorological and hydrological drought indices in a humid climate region – the Poyang Lake catchment in China

    Based on the estimation of standardized precipitation–evapotranspiration index (SPEI) and standardized runoff index (SRI), this study investigated the variability and correlation of hydrological drought and meteorological drought in a humid climate region – the Poyang Lake catchment in China. Results indicate that the occurrences of hydrological droughts in the catchment are different from ...


    By IWA Publishing

  • Cam correlation analysis using Acoustic discharge measurement

    The low head hydro power plant in Wettingen, Switzerland, is in operation since 1933 and no effective cam optimization has been carried out up to now. The goal of the measuring campaign was to provide data enabling an economic study for a retrofit and upgrade project of the plant and the measurement of the efficiency improvement of turbines after refurbishment. The contribution discusses cam ...


    By HydroVision GmbH

  • Development of ultrasonic streamflow monitoring system using an existing low head broad-crested agricultural small dam

    In this study, we developed a system of continuous accurate monitoring of streamflow, which is composed of a pair of ultrasonic Doppler velocity sensors installed on an existing low head broad-crested agricultural small dam. In case of using this dam, errors in computing area are minimized due to stability of it, so that discharge can be accurately measured. In addition, by direct measurement of ...


    By HydroVision GmbH

  • Comparing grey formulations of the velocity-area method and entropy method for discharge estimation with uncertainty

    Two methods, namely the velocity-area method and the entropy method, for assessing with uncertainty discharge measurements at gauged river sites are analysed and compared; uncertainty is represented through the grey number technique. Two different approaches for the ‘greyification’ of both methods are presented. In the first approach, the uncertainty affecting each measurement used ...


    By IWA Publishing

  • Eastern Municipal Water District Proactively Expands EMIS to Maximize DMR Reporting Accuracy and Efficiency

    It wasn’t gold but a more valuable resource that the county of Riverside, California sought back in 1950. The droughts of the late 1940’s were hard on the community and farms – the situation was grave. Local leaders knew they needed access to the Colorado River Aqueduct and soon established the Eastern Municipal Water District (EMWD). This new agency negotiated an agreement with ...


    By IHS Markit

  • A grey-based method for evaluating the effects of rating curve uncertainty on frequency analysis of annual maxima

    A grey-based technique for characterizing the rating curve uncertainty due to discharge measurement errors and its effect on flood frequency analysis is here presented. On the basis of river stage and discharge measurements, the grey parameters of the rating curve are estimated by using a grey non-linear regression. Commencing with this grey rating curve and a set of annual maximum stages, we ...


    By IWA Publishing

  • Lobsterman’s wharf

    Lobsterman’s Wharf is a seasonal restaurant serving seafood and meat dishes. Fried as well as grilled food is on the menu. There is also a 14-room inn as part of the property. All kitchen wastewater flows through an automatic grease removal unit prior to entering an existing grease trap. Sanitary and kitchen flow enters a pump station that pumps the influent to the treatment plant located ...


    By Walden, Inc.

  • Discharge Measurements In Low Flow Conditions With ADC p t echnology – First Experiences In Nepal

    Low flows prevail during about nine months of the year in Himalayan rivers as a result of the influence of the monsoon climate. They account for a large portion of the annual water balance and accurate information about these flows is therefore critical for water resources planning, development, management and hydropower design. Issues that occur with the neighbouring country India are often ...


    By Teledyne RD Instruments

  • Online discharge measurement with OTT SLD

    Background For the economic management of the waterways between Elbe and Oder it is essential to know the discharge of these rivers at defined locks. The authority for water and navigation (WSA) in Lauenburg operates hydrological stations for the measurement of water level and discharge to effectively regulate the water flow at the locks in Plau and Malliß ...


    By OTT HydroMet

  • Online discharge measurement with horizontal doppler-flow sensor

    Background The regional authority responsible for the barrages in the Free State of Saxony is in charge of the water management of the Rötha. Reservoir. This reservoir is situated close to the river Pleiße, from which the water is led over a weir into the reservoir.. Knowledge about the inflows of the reservoir is important for the water management there. So far, the ...


    By OTT HydroMet

  • MCerts: The Fuller Picture

    The introduction of MCerts for self-monitoring of discharge flows focused attention on areas of flow measurement that had been long overlooked. But the story is far from complete. WRc’s Andy Godley reports. It is more than two years since the Environment Agency’s MCerts scheme for self-monitoring of discharge flows became mandatory. This meant that those discharging treated water to the ...


    By WRc plc

  • Estimating Potential EH&S Benefits

    Gaining acceptance and funding for implementing an Environmental Management Information System (EMIS) within an organization often depends on whether the Environmental, Health & Safety (EH&S) department has a “seat at the table.” If EH&S does not have a “seat at the table,” as is the case in many, many organizations, conducting an accurate and accountable estimate of potential system benefits ...


    By E2 ManageTech

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