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Stormwater

by Mog,Justin M last modified Feb 17, 2014 05:39 PM

UofL is taking a variety of steps to reduce flooding and divert stormwater from the sewers by promoting infiltration and recharging aquifers.

The massive, unprecedented flood which hit UofL on August 4, 2009, causing $20.9 million in damage, was a wake-up call for many. It hinted at the increasing intensity of storms to come as our greenhouse gas emissions continue to warm the planet and alter the climate we once knew. But it also helped motivate us to take action to both mitigate our climate impact, and to adapt to a changing climate by getting serious about sustainable stormwater management. Further flooding on May 29, 2012 not only validated our concerns, but demonstrated that our work since 2009 to enhance stormwater infiltration has begun to pay off. Read more.

UofL is working with Louisville's Metropolitan Sewer District (MSD) on a variety of "green infrastructure" projects to help keep stormwater runoff out of the combined sewer system. In the past, every raindrop that hit UofL's rooftops (over 2.2 million square feet on Belknap campus alone!) and pavements was channeled into the same sewer system that handles our sewage which truly needs to be treated. But, as our former Vice-President for Business Affairs, Larry Owsley put it, "When you have that much rain in that short a time, the sewers — which are large sewers — just back up and there's no place for the water to go." Even if the sewers can handle stormwater from UofL, the treatment plants at the end of the pipe often cannot, leading to dangerous releases of untreated sewage into the Ohio River - a threat to human health and ecological integrity.

UofL has pursued means of lessening the risk of flood and reducing our campus' contribution to the problem by diverting stormwater from the sewer system all together through infiltration and rainwater harvesting projects, or by slowing its release through water absorbing changes to our campus landscape. Around campus, we have disconnected downspouts, installed vegetated green roofs, and built rain gardens and bioswales to facilitate groundwater recharge through infiltration.

Stormwater Management Projects

In recent years, UofL made several changes to campus landscaping, parking lots and rooftops, with the help of $1.25 million in cost-sharing from MSD. We think that this significant investment will essentially pay for itself by helping prevent millions of dollars in future flood damage. We are also hoping the projects at UofL will serve as an example for similar projects across the city on both public and private property. MSD's investment in Belknap campus stormwater projects is part of an $850 million agreement that MSD made in federal court with the U.S. Environmental Protection Agency and state regulators in 2005 to reduce the incidence of combined sewer overflows into waterways during storm events.

Rain barrels - Garden Commons 6-22-11 Law School Courtyard Rain Garden Plan Permeable Pavers Diagram Projects at UofL include:

  • Rain Barrels: Rainwater harvesting from the roof of the Cultural Center for irrigation use in the campus Garden Commons. Three rain barrels were also installed in 2013 to capture water from the roof of the Urban Studies Institute (426 W. Bloom St.) for use in the Horticulture Zone garden behind the building.
  • Bioswales: Vegetated bioswales are stormwater runoff conveyance systems which provide a natural alternative to sewers. They help reduce threats to water quality by infiltrating the first flush of storm water runoff and filtering the large storm flows they convey. UofL utilizes existing natural drainage swales whenever possible, and enhances them with native plants to encourage infiltration and filter out contaminants. A bioswale was designed to handle stormwater from the roof of the new College of Business expansion.
  • Rain Gardens: Areas of campus will be redesigned to channel runoff into shallow depressions which can be replanted with deep-rooted, native species to facilitate infiltration, converting a waste problem (runoff) into a beneficial good (groundwater). Pending funding, rain gardens are planned for the Law School courtyard and for the area between the Duthie Center for Engineering and the J.B. Speed building.
  • Pervious Pavements: UofL is moving away from the traditional method of creating hardscapes which prevent infiltration and channel stormwater to sewers. Instead, we are creating lots, roadways, plazas, and sidewalks by either pouring pervious pavement, as is being used in the Dental School renovation, or laying permeable pavers, as have been used in the Red Barn plaza, University Tower Apartments plaza, and Grawemeyer Oval loop renovations, and the Garden Commons community gathering space.
  • Green Roofs: Vegetated roofs are not only beautiful, but they help moderate temperatures to reduce the urban heat island effect and building energy demands for cooling and heating, while reducing storm water runoff, generating oxygen, and providing wildlife habitat in the urban landscape. They can also be designed as green spaces for urban dwellers looking to escape the concrete jungle. UofL has begun installing green roofs to help demonstrate their many benefits, with projects including:
    1. A green roof that is sprouting on the first building at the new Nucleus Innovation Park-Market Street, a subsidiary of the UofL Foundation. The eight-story, 200,000-square-foot, LEED building is expected to open in May 2013 and Bernheim Forest nursery specialists are advising building contractors how to design and maintain the roof, which will feature Kentucky native plants;Green Roof on College of Business Dedication 6-5-12 Cardinal Towne Green Roof
    2. The new M. Krista Loyd Sky Garden atop the College of Business Equine Addition, is a 942-square-foot area of pre-vegetated sedum mat with 4”-6” fill material installed in 2012;
    3. An accessible roof patio planted with sedums and a vegetable garden atop the Early Learning Center at Family Scholar House, at the northwest corner of Belknap Campus; and
    4. A huge vegetated roof installed atop the new Cardinal Towne affiliated student housing and retail facility which opened on Cardinal Blvd. in 2011.
    Ekstrom Library west lawn infiltration basin (fall 2012)Grawemeyer Oval renovation 2011Stormwater Infiltration Project at Grawemeyer Oval (Aug2011)Monitoring equipment installed by CIR at College of Business parking lotInfiltration Pit in UPDC Parking Lot (July2011)Speed Art Museum infiltration gallery
  • Infiltration Basins: Many traditional-looking parking lots, plazas and lawns across campus now conceal advanced stormwater infiltration systems. Instead of draining to the combined sewer system, these areas drain to large underground infiltration basins capable of handling huge rainfall events and the water from surrounding rooftops. These designs were included in the following projects (with the square footage of impervious surface area mitigated in parentheses):
    1. Ekstrom Library western lawn - completed in fall 2012, this infiltration system captures roof run-off from surrounding buildings (108,000 sf)
    2. The UTA/Ville Grill plaza renovated in 2011. (14,550 sf)
    3. The Red Barn plaza renovated in 2011. (4,120 sf)
    4. The Grawemeyer Oval lawn renovated in 2011. (76,368 sf)
    5. The College of Business parking lot renovated in 2011. (86,052 sf)
    6. The parking lot behind Bettie Johnson Hall, the Urban Studies Institute, and University Planning, Design & Construction renovated in 2011. (67,629 sf)
    7. The Speed Museum expansion project has been designed with a large infiltration basin beneath the plaza which will be able to handle roof drainage from Strickler Hall, Life Sciences, and the College of Business. (94,304 sf)
    8. The new Student Recreation Center opened in October 2013 with an infiltration system that is larger than originally planned. It has a connected load that captures rainwater from most of the land surrounding Billy Minardi Hall as well. (317,115 sf)
    Researchers from UofL's Center for Infrastructure Research have installed monitoring equipment to study infiltration rates, storage capacity, and the performance of these designs.
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