Spillways Articles

  • Establishment and application of three-dimensional realistic river terrain in the numerical modeling of flow over spillways

    We present an integrated three-dimensional (3D) spillway model where the realistic and complicated river terrain is implemented by the platform CATIA (Computer Aided Three Dimensional Interactive Application). This integrated 3D spillway model allows for complicated topographic and geomorphic conditions and describes the spatial distribution of the spillway dam (upstream reservoir, downstream ...


    By IWA Publishing

  • Rock Island adult fishway extension - Case Study

    Rock Island Dam is located on the Columbia River, approximately 15 miles south of Wenatchee, WA. The development of a crack in a spillway of Wanapum Dam, downstream of Rock Island Dam necessitated a 25 foot drawdown of the tailrace. This created a significant obstacle for the fish migrating upstream; they would not have access to the original fish ladder. With the arrival of the ...

  • Case study - Reservoir Aabach Germany - Continuous monitoring of contact pressure

    With a total volume of approximately 20 million cubic meters of water and a length of 450 meters, the reservoir supplies drinking water for 200.000 people in the area and fulfils also an important  function in the flood protection there. With the new monitoring solution it was possible to reduce the workload and cost for collecting, reading out and transmitting of data significantly. An ...


    By The OTT Hydromet Group

  • Distribution of mean flow and turbulence statistics in plunge pools

    When the capacity of the spillway of a dam is exceeded for a given flood, overtopping occurs; in such cases potentially dangerous hydrodynamic actions and scour downstream of the dam need to be foreseen. Detailed studies of jets impinging in plunge pools from overflow nappe flows are scarce. This work addresses plunge pool flows, and compares numerical results against our own experiments. The ...


    By IWA Publishing

  • Modeling scour depth downstream of grade-control structures using data driven and empirical approaches

    Local scour occurs in the immediate vicinity of structures as a result of impinging on a bed with a high velocity flow. Prediction of scour depth has an important role in control structure management and water resource engineering issues, so a study of new heuristic expressions governing it is necessary. The present study aims to investigate different methods' capabilities to estimate scour ...


    By IWA Publishing

  • 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 ...


    By IWA Publishing

  • Case study - One-pass-trencher used to repair Tyler Dam

    Greg DeWind takes pride in his one-pass trenching machine. With a smile on his face, he watches Wednesday as it is used to dig a trench at the Lake Tyler Dam. The 225,000-pound, 3,000-horsepower machine mixes soil, cement and bentonite clay as it cuts a trench that is 2 1/2-foot wide and about 70 feet deep, according to Steve Richards, with ETTL Engineers and Consultants. It burns about 100 ...

  • Experimental study on improvement effect of guide wall to water flow in bend of spillway chute

    In order to improve water flow in a bend of a spillway chute using a guide wall, modeling experiments with or without a guide wall under conditions of three different bend axial radii, three chute bottom slopes and three flow rates were carried out in this study. Two indexes were calculated, which are the improved water surface uniformity and the reduced rate of water surface difference in ...


    By IWA Publishing

  • Meshless particle modelling of free surface flow over spillways

    A meshless Lagrangian (particle) method based on the weakly compressible moving particle semi-implicit formulation (WC-MPS) is developed and analysed for simulation of flow over spillways. To improve the accuracy of the model for pressure and velocity calculation, some modifications are proposed and evaluated for the inflow and wall boundary conditions implementation methods. The final model ...


    By IWA Publishing

  • ROMAG storm water screen system for the CSO works La Maladière in Neuenburg

    With the RSW-K high-capacity storm water screen and a emergency shut-off valve, the volume of the upstream sewerage system is optimally utilized and the receiving body ideally protected against contamination. The storm water screen removes visible solids from the sewage water before the water is discharged into the receiving body. At the La Maladière surplusing works, the ROMAG RSW-K ...


    By ROMAG aquacare ag

  • Four free surface algorithms for the 3D Navier–Stokes equations

    Four algorithms are described for computing a steady free water surface with the solution of the three-dimensional (3D) Navier–Stokes equations. The numerical methods are used in hydraulic engineering cases, typically spillways and river modelling. The algorithms were tested against a laboratory experiment of a v-shaped broad-crested weir. The complex geometry of the weir introduced ...


    By IWA Publishing

  • Cox creek spillway improvements access road, Baltimore, MD - Case Study

    GEOTERRA® mats were employed for site access roads to an outfall from a dredge material containment facility. Because the outfall is located on the bay side of a containment dike, it is considered an environmentallysensitive area and lies within Maryland’s Critical Area—the naturally vegetated area within specified boundaries of the state’s tidal waters. Low Impact ...


    By Presto Geosystems

  • Rocky reach spillway apron underwater concrete repair - Case Study

    We were contracted to preform an underwater concrete repair to the spillway baffle under spill gate 3, and preform an inspection of the spill way and dentate from spillway 2-8 and 9-12. The spillway was separated into two sections by a fish ladder between Bays 8 and 9. The perimeter of the eroded areas were delineated using an U/W track creating a key way, ensuring a minimum depth of repair, ...

  • Prediction of cavitation damage on spillway using K-nearest neighbor modeling

    Cavitation is a common and destructive process on spillways that threatens the stability of the structure and causes damage. In this study, based on the nearest neighbor model, a method has been presented to predict cavitation damage on spillways. The model was tested using data from the Shahid Abbaspour dam spillway in Iran. The level of spillway cavitation damage was predicted for eight ...


    By IWA Publishing

  • Comparison of water supply dams’ spillway performance in Malaysia

    This paper compares the risk of dam overtopping of two rolled compacted concrete (RCC) dams in Malaysia. Uniform methodology was carried out by selecting an appropriate probable maximum precipitation (PMP) series, performing a catchment PMP/PMF (probable maximum flood) rainfall runoff routing and finally, routing the inflow hydrographs through the reservoir water body. The critical PMP/PMF ...


    By Inderscience Publishers

  • Simulation of overflow nappe impingement jets

    Rectangular jets constitute one of the energy dissipation methods in the overtopping of dams. The high turbulence and aeration phenomena that appear in falling jets and dissipation basins make it difficult to carry out studies based only on classical methodologies. There are studies modelling spillways with computational fluid dynamics which produces accurate results. However, the study of ...


    By IWA Publishing

  • Case Study: Laurel Bed Dam

    Background Froehling & Robertson Inc were engaged by the Virginia Department of Game and Inland Fisheries to remediate seepage paths at the Laurel Bed dam. The dam had been leaking in excess of 500 gpm with water leaking in multiple locations. This water supply feeds a popular trout stream. If the dam failed, homes in the valley below the dam could be flooded. Q: ...


    By Willowstick Technologies LLC

  • Nakoma Brook flood & hydraulic analysis & engineering study Sloatsburg, New York

    Performed Hydrologic Studies and Hydraulic Engineering Investigations and Designs for the Nakoma Brook Watershed located in Western Rockland and Southeastern Orange Counties, encompassing over 8 square miles. The study area focus was in the Village of Sloatsburg, NY at the intersection of Route 17 and Eagle Valley Road. Flood Control analyses were conducted using USACOE's HEC-1 and HEC-2 computer ...


    By GEA Engineering PC

  • Beneficial effects on water management of simple hydraulic structures in wetland systems: the Vallevecchia case study, Italy

    Conflicting water uses in coastal zones demand integrated approaches to achieve sustainable water resources management, protecting water quality while allowing those human activities which rely upon aquatic ecosystem services to thrive. This case study shows that the creation and simple management of hydraulic structures within constructed wetlands can markedly reduce the non-point pollution from ...


    By IWA Publishing

  • Ballymeade Homes & Town homes, Wilmington, Delaware - Case study

    Project Name: Ballymeade Homes & Town homes Product: Slopetame2  Application: Slope Stabilization City: Wilmington State/Province: Delaware Install Date: October 1996 Install Size: ...


    By Invisible Structures, Inc.

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