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<br /> h2# <br /> wetted cross-section will be obtained using the hydraulic profiling method. Hydraulic <br /> profiling is accomplished by measuring independent point velocities at predefined <br /> coordinates within the wetted cross-section and then integrating them to produce the <br /> average velocity. At least 3 hydraulic profiles will be captured at each site. As <br /> prescribed by the data analyst, volumetric tests or weir tests may be required to <br /> augment the hydraulic calibration effort at any site. <br /> Rainfall Event Monitoring <br /> , - - <br /> Adequate rainfall will be necessary to establish the relationship between peak inflow <br /> and rainfall intensity. Generally a minimum of six non-surcharging storm events will be <br /> needed to develop such a relationship. To develop a relationship between recorded <br /> flows and rainfall events, it will be necessary to accurately record various storm <br /> intensities and durations. Field personnel will install a continuous recording rain gauge <br /> capable of measuring to an accuracy of 0.01 inches. Data from the rain gauge will be <br /> used to analyze' each storm event and establish the hourly intensity of rainfall and <br /> storm event duration. All data will be presented in the report. The rain gauge location <br /> will be approved by the CITY prior to installation. <br /> Meter Removal <br /> Upon completion of the flow monitoring phase of the project, all temporary flow meters, <br /> the rain gauge, and installation hardware will be removed. All data collected during the <br /> monitoring will be presented in the report. <br /> 8 Flow Data Analysis and Report <br /> The flow data will be routinely analyzed throughout the monitoring period. Weekly data <br /> processing provides a quality control measure to ensure that the data is accurate and <br /> that the field calibration process is complete prior to the removal of the monitors. The <br /> flow sites will be balanced throughout the network to enable discrete volumes of the <br /> flow components to be determined. The components of base flow, base infiltration, and <br /> rain induced inflow will be understood for later comparison and evaluation. Analysis of <br /> flow data includes tabular and graphical formats presented in one-hour increments. By <br /> plotting the flow data hydrographs against the rainfall hyetographs, a relationship can <br /> be developed and summarized. This summary will consist of day-by-day analysis of <br /> total daily flows under both dry and wet weather conditions. <br /> A report will be generated that will compare the III reduction estimates to the actual III <br /> removed. This report will indicate the success of the program and will make <br /> recommendations for a continued maintenance program in Sub-basin 10. <br /> G :\DALLAS\C 0 NTRACT\SAN MAR C.DO C June 25, 1996 <br />