AgdaPkt 2004-09-27 - Laserfiche WebLink

Browse Search

_ �A � City of Redwood City Recycled Water Task Force Report Marc6 3, 2004 The potable water demand reduction from this program is estimated to be 46 AF/Y. The estimated cost of this program is $145,000. 3.1.4.3. Hot Water Recirculation Pumns A hot water recirculation pump provides nearly instantaneous hot water at showers and faucets, eliminating the waste and inconvenience of waiting for hot water. Pump models typically installed in existing buildings utilize the cold water pipe as the return to the water heater and are installed (a) under the vanity farthest from the water heater or (b) at the water heater, with a temperature-sensitive valve installed under the farthest vanity. The Task Force believes that this program may gain wider acceptance than other conservation programs because it provides a comfort to the customer in addition to saving water. This program complements City programs that encourage installation of low-flow showerheads, which increase wait times for hot water. As part of the hot water recirculation pump program, the City would promote the use of these pumps and offer $100 rebates (pumps cost from $125 to $500 each) to 1,000 water customers that install a pump, for an estimated program cost of $100,000. Based on a reasonably conservative water savings estimate of 5 gallons per household per day, this program is estimated to reduce potable water demand by 6 AF/Y. The pump manufacturers estimate savings of 25 to 44 gallons per household per day, with considerable variation depending on home layout and usage patterns. 3.2. Other Potential Measures Recognizing that future potable water supply and demand may be different than estimated, the Task Force recommends that the City investigate and/or implement OPMs 1 through 10, which are identified as potentially effective ways to further reduce potabie water demand. While promising, most of these additional measures either (a) generate savings that are difficult to quantify, (b) require additional research to confirm their viability, or (c) depend upon improvements in existing technology. These OPMs are intended to give the City additional flexibility to meet future potable water supply demands. The OPMs are listed below. 1) Further Investigate Potential Use of Groundwater 2) Consider a Commercial Toilet Replacement Program 3) Promote Conservation 4) Adopt an Ordinance to Implement Conservation Measures 5) Consider Requiring Low-Flow Urinals in New Construction 6) Consider Requiring Conservation Devices in New Construction 7) Evaluate Incentives for Electronic Eye Faucets 8) Investigate Potential Water Swaps with Other Potable Water Conveyors 9) Evaluate Emerging Automated Landscape Irrigation Technology 10) Evaluate Emerging Treatment Technology 3.2.1. OPM #1— Further Investigate Potential Use of Groundwater Based on the study Feasibility of Supplemental Groundwater Resources Development, Redwood Ciry, California, prepared by Todd Engineers and dated March 2003, use of groundwater appears _..