b'LT ENGINEERINGCATALOGOutdoor demand consists of the volume of water to To determine the demand for the rainwater, calculate be used for irrigation of grasses and landscaping, waterthe amount of water planned to be used in a one month fountains, or other water features. Different types ofperiod. While the amount of water needed for lawn vegetation have different water requirements. Research maintenance varies depending on current weather factors, is required for the specific design features of the system the climate for the area, and the time of year, the general in question.rule of thumb is for the lawn to receive 1 inch of water per week during dry conditions. Using the following conversion See the example of sizing for demand below for additionalcalculation: 1 in/wk12 in/ft x 7.48 gal/ft3 = 0.623 gal/ft2information regarding this aspect.This demand equates to 0.623 gallons per square footExample of sizing: A warehouse facility in Houston, TX plansof lawn area each week. Therefore, Stormwater Qualityto use collected rainwater to irrigate the landscaping on Determine the average monthly demand in gallons/the property site. The building is a rectangular structure,month:150 feet x 50 feet, with a flat roof. The landscaping area Landscaping area = 4,500 square feetconsists of multiple flowerbeds and a large grassy region Irrigation Rate = 0.623 gal/ft2per week x 4,500 ft2 =with a total combined area of 4,500 square feet. The runoff2,803 gallons/weekcoefficient is determined to be 0.80. Annual precipitation 2,803 gal/wk x 4.2 weeks per mo. = 11,773 gal/mo.from demographics of the region show 49.8 inches per The average monthly demand for rainwater is year is received. approximately 11,775 gallons.The supply of rainwater available each month exceeds the What is the optimum size for the rainwater storage tank? demand planned for its use.To determine supply using the Rational Method equation: Sizing a 16,000 gallon RainTrooper for this application would create a reserve of approximately 4,000 gallonsQ = CIA per month.Runoff Coefficient (C) = 0.80 MAINTENANCERainfall Intensity (I) = 49.8 inches per year / 12 months =4.15 inches/month ParkUSAs RainTrooper Systems are designed to be Roof area (A) = (150 x 50) = 7,500 square feet easily operated and maintained. Regular and on-going Conversion factor - 7.48 gallons of water per one cubic footinspection of the system should be conducted, which of area. includes visually inspecting all system components and cleaning of catchment area, gutters, and filters as needed. To determine the average monthly supply in gallons/ Pumping the first-flush system should be done quarterly month, first convert the rainfall intensity from 4.15 inchesinitially, and then adjusted to a maintenance schedule per month to feet per month based on site characteristics and environment. A pumpI = 4.15 in/mo. divided by 12 in/ft = 0.3458 ft/mo. truck may be utilized to remove grit and trash from the Therefore, Q = C x I x A, now can be calculated: storage tank. Maintenance of the pump is done as requiredQ = 0.80 x 0.3458 ft/mo. x 7,500 square feet x 7.48 gal /by pump manufacturer requirements. Typical pump cubic feet = 15,520 gallons / mo. maintenance includes cleaning of debris on the suctionQ = 15,520 gallons per monthmonthly supply ofscreens of the pump.rainwaterINFO@PARKUSA.COM|888-611-7275|WWW.PARKUSA.COM 213'