Prototype measurements made at Beltzville Dam were of special interest in that (a.) the prototype is very similar in design to the model (which received extensive testing prior to prototype construction); (b.) the long, straight conduit (approximately 178 diameters) lent itself to the development of a uniform gradient; and (c.) a slug-type flow known as "burping" had been experienced at the project. Tests were conducted in the 7-ft-diam flood-control conduit and in the water-quality control intake structure. Measurements included : (a.) hydrostatic pressures at seven piezometer pairs along the conduit, (b.) pressure fluctuations in the conduit transition zone and downstream of the water-quality control gate, (c.) air demand downstream of the control gates, (d.) impact pressures in the water intake tower, (e.) pressures in the converging vertical bend at the base of the wet well, and (f.) high-speed motion pictures of the slug flow at the outlet portal. Good agreement was found between the comparable model and prototype data. Intake and conduit resistance loss coefficients were consistent with those at similar projects. Exit portal pressures were approximately equal to those recorded at other projects. Air demand-gate opening relationships for the flood-control system were similar to those predicted in hydraulic design criteria. No serious pressure fluctuations were recorded, including the period during slug flow. The burping condition did, however, create some erosion in the downstream channel.


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    Titel :

    Outlet Works for Beltzville Dam, Pohopoco Creek, Pennsylvania: Prototype Tests



    Erschienen in:

    Erscheinungsdatum :

    1975


    Format / Umfang :

    4975300


    Medientyp :

    Report


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :


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