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It is recommended that the total net recharge that occurs via the canal be prorated to the <br /> various canal segments based on the percent representation of the segment (see Table <br /> 2). <br /> For both recharge ponds and canal segments, the estimated SDF factors should be <br /> used to determine when recharge water reaches the South Platte River (see Tables 1 <br /> and 2). Daily net recharge values should be summed on a monthly basis and be lagged <br /> to the river using the SDF View computer model. <br /> Accounting <br /> To adequately quantify recharge to the South Platte River that will result from the <br /> operation of the recharge project, it will be necessary to standardized measurement <br /> collection and reporting methods. This standardization will also be important for <br /> purposes of leasing any excess credits that the project may produce. <br /> The following list summarizes data collection that should be made in the operation of this <br /> recharge project: <br /> • Union Ditch river headgate diversions (recorded daily). <br /> • Inflow to recharge ponds (recorded daily). <br /> • Staff gage readings at recharge ponds (recorded at least monthly). <br /> The following list summarizes calculations that should be made on a monthly basis from <br /> the data collected in the recharge project: <br /> • Evaporation and evapotranspiration at each recharge pond and canal segment. <br /> • Net recharge at each recharge pond and canal segment. <br /> • Stream accretion in river using SDF values for recharge ponds and canal <br /> segments. <br /> Recommended example accounting forms are included in Appendix B. <br /> Recommended Implementation Plan <br /> This section recommends a general plan for implementing the recharge project. <br /> The first step should be to firm recommendations for the proposed sites by performing <br /> cursory field investigations, which might include some light backhoe work. Based on the <br /> findings of these initial investigations, it may be of interest to drill test holes to better <br /> understand the potential for water infiltration into the aquifer. However, it is generally <br /> believed that there is a layer of gravel just below the top soil at the proposed sites, which <br /> is a favorable infiltration material. For this reason, it may not be necessary to perform <br /> extensive geology tests to analyze soil infiltration characteristics, as they are likely <br /> feasible for ground water recharge. <br /> The next step should be to excavate the pond(s) and set up for water delivery and <br /> measurement to the site(s). Once the project is operational, water delivery to the site(s), <br /> Aqua Engineering, Inc. Recharge Project Potential <br /> February 17, 2004 - 14- <br />