Laserfiche WebLink
<br />3. <br /> <br />Determine Land Uses hrllewer Subareas <br /> <br />'....I <br /> <br />3.1 Delineate subareas that drain to points along the modeled sewers, and digitize their <br />boundaries. Consider the sewer service areas identified in the 1993 Sewer Master Plan <br />Update when delineating subareas. The size of the subareas wiIl be kept reasonably <br />consistent to improve modeling accuracy. To accomplish this consistency, some smaller <br />areas discharging to different manholes along a modeled sewer will be combined into a <br />single subarea discharging at a single manhole. <br /> <br />3.2 Convert the City's AutoCAD General Plan map to a GIS format to allow spatial processing. <br />Add land uses in neighboring cities that contribute flows to Santa Ana's sewer system to <br />the GIS map. Use the GIS to determine the acres in each land use category for each sewer <br />subarea. <br /> <br />3.3 Estimate the population and employment corresponding to the City's general plan using <br />factors provided by the City planners. Compare these buildout estimates to the actual and <br />projected populations in census tracts based on the City's 2000 census data and the Orange <br />County Projections 2000 data. Identify sewer subareas in which the existing land uses and <br />densities are significantly different from the general plan. Develop an "existing percent <br />developed" factor for each subarea for use in modeling existing conditions. <br /> <br />3.3 Request water sales data from the City for major water users and totals by land use <br />categories. Determine which users should be modeled as point loads. Establish <br />percentages of flow by land use category to be used in establishing design criteria. <br /> <br />4. Perform Flow Monitoring and Flow Analvsis <br /> <br />4.1 Review the flow monitoring conducted during the 1993 Master Plan Update. Determine <br />appropriate locations for up to 20 temporary flow monitors to provide information for <br />model calibration and an infiltration/inflow (VI) study. Considerations for monitor siting <br />shall include the locations ofthe OCSD long-term monitors in the City, age ofsewers in <br />different parts ofthe City, areas suspected of having high III, areas having special land <br />uses, and locations where flow data may be useful for sizing of projects that are likely to be <br />included in the CIP. Prepare a monitoring plan summarizing the recommended monitoring <br />program, including the number and location of monitors, the reason for each monitor, and <br />the procedure to be used to determine when the monitors should be installed and removed. <br />In addition, provide a Microstation map showing the proposed monitor locations and the <br />sewer subareas. <br /> <br />4.2 Upon approval of the monitoring plan by the City, install and maintain up to 20 temporary <br />depth-velocity flow monitors for up to eight weeks. Obtain calibrated NEXRAD rainfall <br />data for the monitoring period for use in the III analysis. Provide depth, velocity, and flow <br />in IS-minute increments in electronic form and as flow hydro graph plots. <br /> <br />4.3 Analyze the flow and rainfall monitoring data to estimate the dry weather flow, rainfall- <br />dependent III, and groundwater infiltration for each of the temporary monitors and the <br />OCSD monitors. The analysis of the flow monitoring data shall consist of comparing <br />flows recorded during significant storm events to typical dry weather flows on an hour-by- <br /> <br />CS ~87 FORM: C:\DOCl.rME~ l\cleeshaw\LOCALS-l\TemplAi'"eemenl Package for city Altoml:y-.doe <br />