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River Islands Development at Lathrop January 2021 <br /> FINAL River Islands Non-Potable Water Technical Report Rev 2 #6520 <br /> 3.3.1 Non-Potable Water Peak Month Irrigation Demand Factors Over 8-Hour Irrigation Window <br /> At full buildout conditions and under PMID, the RI NPW irrigation system will be operated daily during the <br /> off-peak windows (night time) to prevent irrigating during the day, reduce exposure to the public, and to <br /> provide a factor of safety as increasing the irrigation window will reduce the NPW irrigation demand. As <br /> determined in Section 3.3 the peak month irrigation demand factors for drip and spray type irrigation <br /> systems are 10.27 and 11.09 inches per month respectively. Converting the irrigation demand factors to <br /> be over a daily 8-hour irrigation time frame (Section 7-12.3 E2 in the City Standards), the peak irrigation <br /> demand factors are equal to 26,977 and 29,136 Gallons per Day (GPD) per acre. These values were <br /> inputted into the NPW distribution model to verify the performance of the system. Table 3-1 below, <br /> summarizes the peak irrigation demand factors over a daily 8-hour time frame and full water balance <br /> calculations are included in Appendix D. <br /> Table 3-1: Peak Month Daily Irrigation Demand Factor Over 8 Hours <br /> Drip Irrigation Spray Irrigation <br /> Parameter Systems Systems <br /> Peak Month Irrigation Demand (inches per month)' 10.27 11.09 <br /> Peak Month Irrigation Demand (gallons per month per acre 278,766 301,067 <br /> Peak Month Daily Irrigation Demand GPD per acre 8,992 9,712 <br /> Irrigation Window per Day(hours) 8 8 <br /> Peak Month Daily Irrigation Demand over Irrigation <br /> Window (GPD per acre) 26,977 29,136 <br /> Notes <br /> 1. For the peak month of July <br /> 11 <br />