AgdaPkt 2004-03-22 - Laserfiche WebLink

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��1 City ot Redwood City Recycled W ater Task Fome Report March 3, 2004 the day) uansmitted from a local weather station. Since City pazks already have similar technology, the ET controller program is targeted at other water users with imgation-only accounts. As part of the Ei controller program, the City would pay the product and installation cost. The water customers wi+uld be expected to pay the on-going service fee. The City would market this program to irrigation-only water users served by the City. The program would be offered to potable and recycled water users because ET controllers will help limit run-off of recycled water due to over-watering. 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 43. Hot WaterRecirculation Pumns A hot water recirculation pump provides nearly instantaneous hot water at showers and faucets, eliminating the waste and inconvenience of wairing for hot water. Pump models typically installed in existing buildings utilize the cold water pipe as the retum 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. T6is 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 esumate 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 potable water demand. While promisiag, 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. Page 8 of 12