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I I I I I I I I I I I I I I I I I I I interconnected circuits or loops, no portion of the system has to rely on a single source. An example of a non-looped configuration is a water line which dead-ends in a cul-de-sac. Another solution is to replace small diameter water lines with larger pipes, usually 8 inches or more in diameter. 5.2 Distribution of Future System Demands According to data furnished by the town, development is occurring in both pressure zones. The maximum elevation for the proposed development occurs on Longs Peak Drive in the Russell Subdivision. The approximate maximum elevation in the upper pressure zone is 5565 feet. Refer to Figure 5. Lyons Valley Park Subdivision (LVP) and most of Stone Canyon Subdivision are in the lower zone. To assess a future configuration of the water system and geographic distribution of 2.5 MGD (section 3.8), the known new subdivisions were added to the model network. All proposed developments were modeled with pipe sizes and hydrant locations that were indicated on the plans. Where the preliminary plans did not state the pipe size, an 8" diameter pipe was used. If hydrants were not shown on the plans, a location was chosen such that the maximum distance between hydrants was 600 feet and the hydrant was located at a street intersection if possible. A new 1.0 MG tank was added to the lower zone southeast of town above Lyons Valley Park. A new tank was also added to the upper zone above the Russell Subdivision. A continuous I2-inch diameter line was added from the PRV, through the center of town to the new 1.0 MG storage tank in the lower zone as an integral part of the future distribution system. This "backbone" through town will provide increased flow available for other parts of the system due to less pressure loss through the main portion of the system. Figure 7 shows the proposed developments and the major proposed facilities. Even with these new facilities in place, several deficiencies from the fire flow analysis in the lower zone are also noted in Figure 7. Results of the analysis of the future system are: 1. System pressures for maximum day are adequate. a. Upper pressure zone - 57 to 120 psi. b. Lower pressure zone - 49 to 109 psi. 2. For fire flow analysis, a fire flow of 1000 g.p.m. was used. The pipe diameters called out in the plans and\or a minimum diameter of 8 inches were dequate for the proposed developments. a. The Stone Canyon development will require that the proposed 8 inch pipe in McConnell Drive (Lyons Valley Park) be extended to the existing 8 inch pipe in Highway 36. This loop under St. Vrain Creek reduces the head loss to Stone Canyon. 34