Laserfiche WebLink
TECHNICAL MEMORANDUM <br /> Project Name <br /> Technical Memorandum Name <br /> As seen in the graph, the anticipated peak demand per fixture unit decreases as the total number of <br /> fixture unit increases. This is in recognition of the fact that the probability of every fixture being in <br /> operation at the same time decreases as the number of fixtures increases. Once the peak demand is <br /> established, a meter with the appropriate capacity for the development is selected. The number of SUEs <br /> for the project is based on the meter selected, as identified in the following table. <br /> Service Unit <br /> Meter Size Peak Flow(pm) Equivalent <br /> 5/8" 10 1 <br /> 3/4" 15 1.5 <br /> 1" 25 2.5 <br /> 1-1/2" 50 5 <br /> 2" 80 8 <br /> 3" 160 16 <br /> 4" 250 25 <br /> 6" 500 50 <br /> 8" 800 80 <br /> METHODOLOGY CONCERNS <br /> As previously indicated, there is a concern that the current methodology is under estimating the impact of <br /> multi-family and commercial developments within the city. A quick analysis of the amount of water used <br /> on a monthly basis would tend to support this contention. The average single-family residence uses <br /> approximately 350 gallons per day per the Water Master Plan. The previously referenced multi-family <br /> development with over 700 bedrooms saw monthly demands on the order of 100,000 gallons. This would <br /> indicate that the water consumption of the multi-family development is 290 times that of a single-family <br /> residence, as opposed to 50 times. This apparent discrepancy is likely due to the difference in the <br /> probability that all fixtures in a single-family residence are in use versus the probability that all of the <br /> fixtures in the multi-family development are in use at the same time. <br /> SYSTEN OPERATION AND DESIGN <br /> Transmission and distribution lines are not designed based on the impact of a single user. They are <br /> designed based on the combined impact of all users within a given area. For a residential development, <br /> the water lines are not designed based on adding up the capacity of all the meters within the area. They <br /> 3 of 7 <br /> Haus 1.aus.apal share\profects10600\018-01\doc\tm-impact fees 3-19-14 docx <br />