Laserfiche WebLink
2019 to calibrate and help verify the accuracy of the computer model_ A summary of the flow test <br />results and location's are listed in Table 2. <br />The water model allows the water system to be examined, while adding proposed features to the <br />system. This provides an indication as to what pressures and flows would be available in the <br />water system with the various proposed features. The model also allows for the examination of <br />component operation within the system such as water tank filling cycles There are many other <br />exercises that the model can be used for in the future in relation to water system operations and <br />planning. The water model can continue to be an operations and planning tool for the expanding <br />water system_ <br />Table 2 Hydrant How Test Results <br />Flo <br />Tes <br />1 <br />Location <br />Field <br />Hydrant <br />Flow <br />(gpm) <br />Pressur <br />Differential <br />Field <br />Pressure <br />Differential <br />Model <br />Pressure <br />Differential <br />(psi) <br />Results <br />(psi) <br />Results <br />(psi) <br />Wine St. NW south off of 147th Ln_ <br />NW <br />1,171 <br />2 <br />1 <br />-1 <br />2 <br />Dead-end on Vanadium St. NW <br />.1,123 <br />4 <br />2 <br />-2 <br />3 <br />Dead-end on 140th Ave. NW <br />1,205 <br />8 <br />, <br />10 <br />2 <br />4 <br />Dead-end en 1 42nd Ln. NW <br />984 <br />26 <br />42 <br />16 <br />5 <br />Corner of Tonto St. NW and Alpine Dr_ <br />NW <br />1,188 <br />4 <br />6 <br />2 <br />6 <br />Dead-end en 152" Ave. NW <br />1.047 <br />9 <br />7 <br />-2 <br />7 <br />Corner of 157th Ave. NW and Krypton <br />St. NW <br />1.152 <br />7 <br />9 <br />2 <br />8 <br />Dead-end en Lithium St. NW <br />'1,047 <br />7 <br />8 <br />1 <br />9 <br />Dead-end of east end of 167h Ln. NW <br />1,197 <br />4 <br />2 <br />-2 <br />10 <br />Dead-end of new cul-de-sac off of <br />159th Ave. NW <br />1,078 <br />6 <br />7 <br />1 <br />. <br />11 ' <br />Current dead-end on 149'h Ave. NW <br />1,234 <br />5 <br />5 <br />0 <br />12 <br />VVest dead-end en 147th Ln. NW <br />1,123 <br />3 <br />8 <br />5 <br />13 <br />Dead-end on 137th Ave_ NW <br />1,188 <br />11 <br />10 <br />-1 <br />14 <br />East dead-end on Rivlyn Ave. NW <br />1,031 <br />10 <br />10 <br />0 <br />During the calibration process of the Ramsey water system hydraulic model, pumping rates, <br />customer demands, and tower water levels were set to the conditions recorded during the field <br />testing. Individual pipe roughness coefficients (C-factors) were adjusted until the calibrated <br />system model closely simulated field test data as indicated in Table 2. As indicated from Tests 4 <br />and 12, the model was unable to be calibrated to match the field tests_ For Test 4, it is believed <br />there was an error when measuring during the fierd test. The age and size of the pipe on 142nd <br />Ln. NW is the same as the pipe on 140th Ave. NW (Test 3), which the model calibrated closely <br />with. It is believed that the pipe roughness coefficient used for the pipe on 142nd Ln. NW is <br />accurate. For Test 12, it is believed that there is another pipe off of Bunker Lake Blvd. that <br />connects to the new development along 147th Ln. NW that is not yet geo-located, because when <br />FEASIBILITY STUDY -DRAFT <br />Page 3 <br />RAMSY 154354 <br />