In order to improve the performance of standard sumps as a best management practice (BMP) in treating
stormwater runoff, a baffle was designed to be installed as a retrofit in standard sumps. The retrofit is a porous
baffle called “SAFL Baffle”. The effect of the SAFL Baffle on the performance of standard sumps was assessed
by conducting laboratory tests on small scale as well as full scale straight flow-through standard sumps equipped
with the baffle.
In addition, a number of tests were conducted to determine the performance of standard sumps with the SAFL
Baffle when the baffle is clogged with debris like trash and vegetation. Furthermore, the performance of two other
configurations of the baffle was studied: (1) the SAFL Baffle in a sump with an outlet pipe 90 degrees to the inlet
pipe, and (2) the SAFL Baffle in a sump with some water entering the sump through an overhead inlet grate.
Standard sumps equipped with the SAFL Baffle were evaluated using two metrics: (1) How well the system
captures sediment during low flow conditions (Removal Efficiency Testing), and (2) how well the system retains
the previously captured sediment during high flow conditions (Washout Testing). The results of the tests showed
that the SAFL Baffle dissipates the energy of water entering the sump and as a result, at low flow rates, it captures
sediment better than a standard sump with no baffle. More importantly, at high flow rates, the washout of the
previously captured sediment reduces to near zero.
McIntire, Kurtis D.; Howard, Adam; Mohseni, Omid; Gulliver, John S..
Assessment and Recommendations for the Operation of Standard Sumps as Best Management Practices for Stormwater Treatment (Volume 2).
Minnesota Department of Transportation.
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