Item 21 - Water Supply Assessment for the Warner - Red Hill Mixed Use Development Project

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T HE W ARNER P ROJECT W ATER S UPPLY A SSESSMENT A UGUST 21, 2020 F USCOE E NGINEERING , I NC. 8 2.1.1 Existing Water Use As mentioned, the existing land use of the Project include office, warehousing, industrial, and a temporary homeless shelter. There are currently three buildings that occupy approximately 160,400 SF at the Project site. See Figure 2 for an aerial image of the existing land uses at the proposed Project site. The water demand factors from the City of Santa Ana Design Guidelines for Water and Sewer Facilities (March 2017)2 were utilized to establish an estimate of existing water demands at the Project site. An industrial water demand factor of 3,500 gallons per day (gpd) per acre was employed to account for three existing buildings at the Project site. In addition, a landscape water demand factor of 3,000 gpd/acre was employed for the scattered landscaping at the Project site. See Table 2 below for estimated existing water demands and the Project site. Table 2 Existing Water Demands Existing Land Use Land Use Square Footage Land Use Acreage Water Demand Factor (gpd/acre) Existing Water Demand (gpd) Existing Water Demand (AFY) Industrial Land Uses 160,400 3.68 2,500 9,200 10.3 Landscaped Area 60,000 1.40 3,000 4,200 4.7 Total 220,400 5.08 -- 13,400 15.0 Notes: gpd gallons per day AFY acre-feet per year As shown above, the estimated existing water use at the Project site is approximately 13,400 gallons per day (gpd) or 15.0 acre-feet per year (AFY). An estimated annual difference between existing water demands and proposed water demands resulting from the proposed Project are calculated and shown in Section 2.1.2. 2 City of Santa Ana Design Guidelines for Water and Sewer Facilities (March 2017). Found here: http://www.santa-ana.org/pwa/documents/DesignGuidelines.pdf