University of Louisville
OP-23: Rainwater Management

The Metropolitan Sewer District (MSD) requires new development projects to have post-developed flow not to exceed pre-developed flow based on 100-year storm modeling. These standards have applied to several projects on campus and are contributing to reduced stormwater runoff from projects such as the HSC Garage II and Clinical & Translational Research building. The University is working with MSD to determine ways to fund installation sub-surface inflitration basins to accept stormwater runoff and replenish the aquifer. In the past few years: -In 2016, UofL's Conn Center for Renewable Energy Research reinstalled the student-designed Phoenix House on campus with large rain barrels for landscape irrigation. The LEED Gold Student Recreation Center features a 30,000 gallon cistern to capture runoff from the roof (as well as HVAC condensate) for reuse in irrigation. Any excess is returned to the aquifer through a massive infiltration basin. The LEED Gold Clinical & Translational Research Building at HSC also features a cistern to capture HVAC condensate for reuse in irrigation rather than draining to the sewer system. -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). -New LEED Gold facility will open in 2018 and has been designed to include an infiltration system in the plaza to the west which will capture roof run-off from the new building, as well from Shumaker Research Building, Schneider Hall, and possibly Lutz Hall. The system was installed in March 2018

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. 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.

There are many more details as to the institution's green infrastructure and storm water practices available at http://louisville.edu/sustainability/operations/stormwater