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<br />,. .. to> <br /> <br />5. <br /> <br />Domestic Use - Domestic water use amounts to approximately 36% of total water use at <br />these facilities. Two water saving measures could be implemented to reduce the domestic <br />water consumption at these facilities: installation of toilet retrofit devices and faucet <br />aerators. <br /> <br />Flush-valve toilets are located in public areas of the State Capitol Building and throughout <br />the State Office Building. For flush-valve type toilets, installation of Sloan Valve retrofit <br />kits will reduce flush volume from 4.5 to 3.5 gallons per flush. Cost of these kits is <br />approximately $15 each. Other less expensive retrofits are also marketed for flush valve <br />toilets. Labor requirements to install these devices are approximately 30 minutes each. <br /> <br />Private restrooms in the State Capitol Building have older tank-type toilets, using <br />approximately 6 gallons per flush. These stately bathrooms have some historic significance, <br />keeping with the architecture of the building. These toilets do not get the high usage that <br />the public restrooms receive. Installation of toilet dams in these units should reduce volume <br />per flush by about 1 gallon without adversely affecting performance. Cost is estimated at <br />$2.00 per toilet. <br /> <br />Significant savings will also be achieved with the installation of 1. 0 gpm faucet aerators on <br />all faucets in these buildings. Annual water usage for restroom lavatories could be reduced <br />from 535,000 gallons to 153,000 gallons, or a savings of 382,000 gallons per year. Annual <br />water and sewer savings would be approximately $863/year. Assuming 30% of that water <br />is hot water, an additional $688/year savings will be realized from energy savings (gas hot <br />water heater). Cost of a 1.0 gpm faucet aerator is about $1.00 each. <br /> <br />Landscape Irrie:ation - Landscape irrigation is the largest water use at the State Capital <br />Building, amounting to over half of total water use for both facilities. 4,500,000gallons of <br />water applied to 200,000 square feet of landscaped area gives an estimated application rate <br />of 36 inches per year. The recommended water application rate for Kentucky bluegrass in <br />the Denver area is 25-30 inches per year. Reducing water use to 30 inches per year would <br />result in a water savings of 748,000 gallons, or W&S savings of $1690/year. It is also <br />recommended that a schedule of watering every third day be implemented. <br /> <br />It should also be noted that wastewater charges are being assessed for irrigation usage. <br />Approximately $7,5oo/year wastewater charges are being assessed for irrigation usage. The <br />State of Colorado should discuss their billing arrangement with Denver Wastewater to <br />determine if another billing method would be applicable for this facility. Installing a <br />separate irrigation meter for landscape usage is another option that would eliminate the <br />sewer charge and provide better monitoring of irrigation usage. <br /> <br />Unaccounted for Usage - Water not accounted for in this report amounts to approximately <br />9 % of total water use. This discrepancy is probably due to the subjective estimates made <br />during the analysis of water usage and reflects the use of conservative assumptions. Annual <br />water use for these calculations is the average of three years usage. 1989 consumption <br />