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St. Anthony Splash Pad Retrofit Feasibility Study January 24, 2017 Page 5 K:\02170-430\Admin\Docs\MEMO_StA_SplashPadfinal.docx Option 3 – Irrigation The Central Park splash pad is located near the City Water Reuse Facility where stormwater is collected, treated, and used for irrigation throughout Central Park. The irrigation demand of Central Park is currently 7.0 million gallons annually, and the average potable water augmentation from 2011 to 2015 was 2.4 million gallons per year (approximately 34% of splash pad water use). The discharge from the splash pad has the potential to eliminate potable water use for irrigation in Central Park since it is typically available during dry periods as well. The water reuse facility is located near the intersection of Silver Lake Road and 33rd Avenue NE. A lift station would need to be installed to pump the water to overcome the 20 feet of head difference from the splash pad to the water reuse facility to tie into the existing irrigation system (Figure 2, Appendix A). Utilization of reuse water from splash pad, drinking water treatment plant backwash, or stormwater in irrigation systems that are also connected to the potable water supply is in compliance with City building code. If an additional irrigation area was desired, such as the school area, the backflow preventer on the school irrigation system potable water line would need to be upgraded to a reduced pressure zone backflow preventer (RPZ). Highlights  34% of the water used in the splash pad is available for use in irrigation . Expanding the water reuse into the high school irrigation system could decrease annual potable water usage in Central Park by 2.4 million gallons.  Eliminate potable water use for irrigation during an average year  Cost: $169,700 Option 4 – Recirculation The recirculation retrofit for Central Park would redirect water from the existing discharge manhole into a 700-gallon underground storage tank. Treated water would be pumped back to the distribution manifold in the park building. A new sanitary connection would be required for the reuse filter backwash (Figure 3, Appendix A). Highlights  Reduce splash pad water consumption up to 97%.  Cost: $247,900 EMERALD PARK RETROFIT DETAILS Option 1 – Equipment Retrofit The current flow of the Emerald Park Splash Pad is 365 gpm . The addition of low flow nozzles to the splash pad would decrease the flow rate by 72 gpm, reducing the flow rate in the splash pad by 20%. Highlights  Reduce water usage by 20%  Cost: $18,050 Option 2 – Operating Schedule Modification The City could reduce the hours of the Emerald Park splash pad from 12 hours to 10 hours which would reduce water usage by 0.3 million gallons or 3% of the total water use for the year. The City can work with the manufacturer to throttle the valves at the splash pad. Highlights  Reduce splash pad water consumption up to 3%  Cost: $800 (Operating hour signage)