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<br />7A - ATTACHMENT NO.3 <br />Saltworks Proposal- Water Group Summary Report (22 January 2010) Page 11 <br /> <br />Chapter 2 - Water Demand Projections <br /> <br />2. 1 Approach <br /> <br />This chapter presents the water demand analysis for the Saltworks project. The water <br />team evaluated the water demand assumptions and projections submitted to the City by <br />DMS in its May 14, 2009 Water Demand Report - Redwood City Saltworks (DMS <br />Demand Report, prepared by EKI, Inc.). The water team then performed a water <br />demand analysis based on the City's standardized approach to evaluating water <br />demand for development projects, which is known as the Attachment Q method <br />(described in Section 2.3). The DMS and Attachment Q-based demand projections were <br />compared and evaluated to determine differences in assumptions and volumes. The <br />total water demand was segregated into potable and non-potable demands. A summary <br />of findings regarding water demand for the Saltworks project is presented at the end of <br />this chapter in Section 2.5. <br /> <br />2.2 DMS Water Demand Projections <br /> <br />The DMS water demand projections for the Saltworks project were estimated based on <br />site-specific planning and water conservation information and published water use <br />models. Water demand was estimated on the basis of "indoor" and "outdoor" water use <br />factors for different land uses. These water use factors were developed on an <br />"employees per 1,000 sqft" or "per unit" basis and applied to the assumed square <br />footage of each land use, or the assumed number of residential units of a specific style <br />or "product type," to estimate the total water demand for that land use category. The <br />demand estimates are highly reliant on the use of water-efficient plumbing fixtures and <br />appliances, efficient landscape and irrigation equipment, precise installation and ongoing <br />site management, and maximizing the use of non-potable water for appropriate non- <br />potable purposes. A brief description of the indoor demand assumptions for each land <br />use type is provided below; substantially more detail about the DMS assumptions can be <br />found in the DMS Demand Report. Outdoor water demands are described in Section <br />2.2.3. <br /> <br />2.2.1 Residential Indoor Demand <br /> <br />According to the DMS Demand Report, indoor residential water use factors were <br />developed for the project using the American Water Works Association Research <br />Foundation (AWWARF) inferential model (from 1999) of residential end-uses of water, <br />combined with a post-model analysis of the water savings that would be achieved <br />through the implementation of water-efficient technologies that were not explicitly <br />accounted for by the AWWARF model. The AWWARF model is based on residential <br />indoor water use data collected by AWWARF from 1996 through 1998 at households <br />from 12 cities located throughout the U.S. and Canada; four of the 12 cities were located <br />within California. Additional water savings assumptions were incorporated into the <br />AWWARF model to account for plumbing fixtures and appliances that are more efficient <br />than those assumed for the 1999 AWWARF model. These additional water savings <br />assumptions are based on several sources, including the EPA's WaterSense Program, <br />the Pacific Institute's 2003 study (Waste Not, Want Not: The Potential for Urban Water <br />Conservation in California), and LEED guidelines. <br /> <br />4 <br />