C+S March 2020 Vol. 6 Issue 3 (web)

The Kipp Charter School has completed its latest expansion for the more than 2,000 students in attendance from pre-school to high school. The new 600-seat athletic stadium, which officially opened on October 24, 2019, was built for football, soccer, and field and track events. To control stormwater runoff from the field, parking lots, and building, two underground detention systems were constructed using a network of chambers that can hold a combined total of nearly 445,000 gallons of stormwater. “One of the main reasons we had to go underground and selected the chambers, is because of the constraints on the footprint of the project, which was previously a driving range of the Bridgeview Golf Course,” explained Amy Nagy, P.E., senior project manager for EMH&T (Co- lumbus, Ohio) who led the design team. “We didn’t have any spare greenspace to provide surface detention and water quality to meet City and EPA requirements. We realized early in the project that we would have to utilize underground system because we couldn’t locate the required storm detention within the floodplain, which was relevant to the project. Utilizing underground detention allowed us to put it underneath the field in the endzones. This allowed us to maximize the footprint of the project in order to accommodate a regulation high school field and desired building. Once we looked at where that was, we didn’t have any room for detention outside of that, so we had to move it within that footprint. “An additional constraint was to make sure we were clear from any of the field underdrains and kept structures out of the turf area. The design for the stadium was following behind the rest of the site plan. We could have put it over the top of it, but basically we placed it in the endzones because they were clear areas, and we wouldn’t interfere with anything as the project phased out.” The project design called for 288 StormTech® MC-3500 chambers to be used and buried with a minimum cover of #4 gravel fill 12 inches over top of the chambers, followed by another 12 inches of compacted material. SystemA, 116 x 89 feet, under the south end of the field, with 168 chambers has a total installed volume capacity of 254,338 gallons of water, while System B, 102 x 74 feet, under the north end of the field with 120 chambers can hold up to 187,000 gallons of water. StormTech chambers, a product of Advanced Drainage Systems, Inc. (ADS) (NYSE: WMS) (Hilliard, Ohio), are designed in accordance MAXIMIZED FOOTPRINT FOR CHARTER SCHOOL EXPANSION Detention Chambers Buried Under New Athletic Stadium INNOVATIVE STORMWATER SYSTEM PROVIDES

with AASHTO, ASTM and CSA design standards, qualifying them for use in commercial and municipal projects. Made from an engineered grade of impact-modified polypropylene copolymer, the chambers are made to provide a minimum 75-year service life. Each chamber, measures 90 inches long x 77 inches wide x 45 inches high and has an installed volume of 1,339 gallons of water (178.7 cubic feet). Ferguson Waterworks (Newport News, VA) supplied the cham- bers and storm pipe from its Columbus, Ohio branch, and coordinated the just-in-time deliveries to the site. Along the sides and on top of the chambers, ADS 0601TG non-woven geotextile was used as a soil separation layer. Underneath the cham- bers, ADS 315WTM woven geotextile was used to add scour protec- tion. Nearly 8,000 square yards of geotextile fabric was used. ADS N-12® 18-inch diameter high-density polyethylene (HDPE) pipe was used to connect the chambers. Plus, 750 feet of four-inch diameter N-12 perforated pipe provides additional drainage into the StormTech chambers. Each of the two systems has two StormTech Isolator® Rows that trap sediment from the stormwater drainage preventing it from settling at the bottom of the bed, which would slow the infiltration rate. The Isolator Rows can be cleaned out by a JET-VAC® process using access from any one of the inspection/clean out ports. ADS FLEXSTORM® inlet filters that are configured based on drain- age structure type and filtration needs were used in the upstream struc- tures with open grates. Each FLEXSTORM unit effectively filters silt, solids and other pollutants and readily fits an ADS pipe system, including the Nyloplast® drain basin. Nyloplast Water Control Structures were used in both StormTech sys- tems as a collection point where one or more drain lines converge. The unit is designed to improve water quality as part of the National To meet stormwater detention requirements, two StormTech chamber systems were installed under the endzones at the Kipp Charter school’s new athletic stadium. Photo: The Daimler Group, Inc.


march 2020


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