Laserfiche WebLink
834 to 950. The corresponding static pressures would then range <br />from 97.9 psi to 47.7 psi. Elevation of low water in the tower <br />will be 1030, with static pressures ranging from 84.9 psi to 36.4 <br />psi. <br />The peak day domestic demand projected for 2013 is estimated to be <br />172 gpm based on a maximum day factor of 1.5. A 200,000 gallon <br />storage reservoir would provide water for 19.35 hours based on this <br />demand. Normal day demand of 115 gpm would be available for 29.0 <br />hours. <br />Based on fire flows of 2000 to 2500 gpm for the commercial lots, <br />this elevated tank would provide water for 1.7 and 1.3 hours <br />respectively. A 750 gpm well pump would boost these times to 160.0 <br />and 114.3 hours respectively. If greater fire flows are required <br />by individual customers, they could provide on site storage for <br />their fire systems. <br />The elevated tank location is currently being reviewed by FAA for <br />possible conflict with the Dane County Regional Airport landing <br />pattern. Preliminary FAA review approximately one year ago <br />suggested that a tower to elevation 1090 might be acceptable at <br />this location. <br />WATER DISTRIBUTION SYSTEM <br />The proposed water system is shown in Figure 3. The water system <br />utilizes a 12 -inch transmission main between the well and the <br />tower. Smaller pipes including 8 and 10 -inch are used for <br />distribution mains. Distribution mains are looped wherever <br />possible, but due to the shape of the area being served, looping <br />was not always possible. Future development will allow for some <br />additional looping and the ultimate development will allow for more <br />looping. The well and elevated storage tank are located in <br />opposite ends of the water system, providing alternate sources for <br />water in case of a breakdown of the connecting main. <br />The water system was modeled with the Kentucky Pipe Program using <br />the Hazen Williams Equation with a C of 100. Computer printout of <br />model results are included in Appendix F. Max hour domestic demand <br />of 362.2 gpm (Year average of 115 gpm * 3.15 peaking factor) <br />distributed across the system resulted in a low pressure of 50.22 <br />psi. Doubling the max hour demand to 724.4 gpm (115 gpm * 6.3) <br />distributed across the system resulted in a low pressure of 46.77 <br />psi. The system proposed is more than adequate for the domestic <br />demand. <br />Fire flows were evaluated at the three ends of the water system. <br />A residual pressure of 20 psi is required at all points in the <br />service area under fire flows. Results are included in Appendix F. <br />A fire flow of 2150 gpm was modeled at node #1 near Highway 19 and <br />the resulting low pressure was 22.19 psi. A fire flow of 2100 gpm <br />was modeled at node #8 which is the most northerly node on Highway <br />51 and also the end of a long dead end main, and the resulting low <br />pressure was 20.89 psi. A fire flow of 2350 gpm was modeled at <br />R <br />