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<br />1) <br />2) <br />3) <br />4) <br />5) <br />6) <br />7) <br />8) <br /> <br />9) <br /> <br />7. <br /> <br />Low flow check structures and related erosion control measures. <br /> <br />In the discussion, pertinent literature reviewed during the project is presented. <br />References applicable to vanous topics are denoted. <br /> <br />Design guidance for the following basic categories IS presented: <br /> <br />l. <br />2. <br />3. <br /> <br />4. <br /> <br />5. <br /> <br />VRR - Vertical Riprap Drop <br />SLR - Sloping Large Riprap Drop <br />GSB - Grouting Sloping Boulder Drop <br />BC - Baffle Apron (Chute) Drop <br />VHB - Vertical Hard Basin Drop <br /> <br />This report presents economic evaluations for these five drop categories, as well as <br /> <br /> <br />the District's present sloping riprap drop design. These evaluations include both <br /> <br /> <br />capital costs and maintenance costs (based on the District's experience). Section <br /> <br /> <br />XI1J presents this information in a graphical form. Included is an economic efficiency <br /> <br /> <br />relationship which should be useful to designers. The efficiency relationships reflect <br /> <br /> <br />the economy of scale and economic considerations for various drop heights and desiqn <br /> <br /> <br />flow rates. <br /> <br />A Desiqn Considerations (or decision) Matrix is provided with special attention given <br />to the following subjects: <br /> <br />Soil and Foundation Precautions <br /> <br /> <br />Structures and Foundations <br /> <br /> <br />Hydraulic Phenomena <br /> <br /> <br />Suggest Hydraulic Anal ysis <br /> <br /> <br />Hydraulic Analysis Difficulty <br /> <br /> <br />Design Hints <br /> <br /> <br />Flow and Drop Height Suitability <br /> <br /> <br />Construction Concerns, including: dIfficulty, material quality and availability, <br /> <br /> <br />and suggested quality control measures including inspection. <br /> <br /> <br />Aesthetic Problems and Suggestions <br /> <br />1-2 <br /> <br />-- <br /> <br />II <br /> <br />II <br /> <br />II <br /> <br />II <br /> <br />II <br /> <br />II <br /> <br />II <br /> <br />II! <br />II <br /> <br />II <br />I <br />I <br /> <br />I <br /> <br />1 <br /> <br />I; <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br />