Construction of the treatment train began in the fall of 2011. The location of the treatment train is on the eastern side of the Saint Augustine Center (SAC) parking garage. This area was chosen as the site for the treatment train to allow stormwater runoff to be routed from the parking garage to the treatment train. The treatment train includes a vegetated swale, two rain gardens in series, and an infiltration trench (IT). The main goals of the construction and research of the treatment train were:
- To collect and infiltrate runoff from the upper deck of the adjacent bi-level parking garage
- To examine water quantity and quality effects of stormwater control measures (SCMs) in series
- To determine if applying SCMs in series decreases maintenance needs and increases system longevity
- To improve the common area’s aesthetic appeal and function for the University
A network of PVC pipes collect runoff from approximately one quarter of the SAC parking garage (10,000 ft2). The flow is routed into a concrete weir box where debris and sediment can settle out prior to entering the treatment train. A series of baffles plates and a v-notch weir steady the flow of runoff entering the system to allow for accurate flow measurements. Runoff then enters the vegetated swale, followed by two rain gardens in series and an IT. There are pervious pavers on top of the infiltration trench to allow overflow to flow out of the top of the trench and into an adjacent storm sewer. Six monitoring locations and five 90 degree v-notch weirs throughout the treatment train provide flow measurements and sampling points throughout the system.
The monitoring and research conducted at the treatment train currently focuses on water quantity. The site has been instrumented to record rainfall, flow rates through the system, temperature, and depth within the IT. These parameters are being used to determine how effectively the treatment train is reducing stormwater runoff volume and peak flows from the parking garage runoff. Additionally, infiltration and recession rates in the IT at the treatment train are monitored to determine the effect of using multiple SCMs for pretreatment has on system longevity and maintenance. Future research will focus on water quality and the performance of each SCM at the treatment train.
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