City Stormwater Management
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Oasis Kwik Carwash Retrofit

Oasis pre-const 3-28-14 005 

The retention basin at Oasis Kwik Carwash on Jiffy Street will be retrofitted as 
part of the 319 grant, the Dry Branch Watershed Project.

The Problem

The basin will help drain excess storm water runoff. Unfortunately, with its proximity to Highway 70 and Wentzville Parkway the basin often fills with litter and debris that block the storm drain preventing proper drainage. This leads to stagnant water which attracts mosquitoes and other unwanted pests. The area collects so much debris that when it is cleaned out every two weeks the trash that is removed is enough to fill a 55 gallon drum. The basin is also often polluted with auto fluids that run off the pavement of the nearby roadways. These fluids not only affect local wildlife but, can also drain into the ground. Once the fluids drain into the ground they can contaminate other water supplies and have far-reaching negative consequences for other aspects of the environment. Cleaning up these kinds of pollutants can also be very expensive. 

The Solution

The buildup of debris in the water is not only bad for the environment.  Debris also prevents the water from draining properly. Plans include expanding the detention area to install bioretention, which uses plants and soil media to filter pollution. Vegetation is selected to help screen trash and allow for easier maintenance. Curbs along the pavement will get removed to allow drainage to spread out over a rock channel, then drain into the bioretention more slowly. This helps reduce erosion and improve infiltration.

Project Progress

  • Construction is 95% complete and landscape maintenance has begun.  Signage will be placed soon.  

  • The design-build team finalized construction cost estimates and landscape drawings.

  • Property owners and the design-build team met in March to review conceptual design elements and options.

Before and After

 Oasis Passive Stage Samplers 5-29-14 010  Oasis Passive Stage Samplers 5-29-14 007
Before construction:  The photo on the left shows trash that accumulates and  
water sampling equipment used to test water quality. 
 Oasis Carwash Basin Retrofit  Oasis Carwash Basin Retrofit 2 
After construction:  Pavement runoff flows through curb inlets.  Soft rush and black-eyed susan
plants easily adapt to wet and drought conditions and help filter runoff water. 
This project is funded by US EPA Region 7 through the Missouri Department of Natural Resources subgrant number G11-NPS-07.



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