UPDATES: April 2013

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New Release: SHSAM 6.60

April 2013 (volume 8 - issue 4)

Contributed by Omid Mohseni, Senior Water Resources Engineer (Barr Engineering Company) and Adjunct Faculty (University of Minnesota).

Funded by the Barr Engineering Company, City of Minnetonka, and Royal Enterprises America.

SHSAM (Sizing Hydrodynamic Separators And Manholes) is a computer program with a graphical user interface which simulates runoff and the removal of suspended sediments from stormwater runoff using the results of the studies conducted at the Saint Anthony Falls Laboratory (SAFL) of University of Minnesota. The runoff component is a continuous hydrologic model for small drainage basins in urban areas. The hydrologic model utilizes the SCS curve number method to simulate excess rainfall, and the SCS unit hydrograph to simulate the runoff hydrograph.

The new version of SHSAM (version 6.60) incorporates washout of the accumulated sediments during high flow conditions. The washout function is based on the laboratory tests conducted at SAFL. Washout can only be computed for those devices which have been tested at SAFL using a mass balance approach (i.e., for ecoStorm, Environment21, Downstream Defender, standard sumps with and without SAFL Baffle and Stormceptor). This version also allows the user to employ a bypass to minimize washout and optimize the overall removal efficiency of the device. The user has the option of comparing the performance of all devices in SHSAM using sediment removal functions without incorporating washout.

In SHSAM 6.60, more precipitation and air temperature data have been added so that users can assess the performance of hydrodynamic separators in 13 different locations from the East Coast to the West Coast of the U.S. In addition, the hydrologic simulation has been slightly improved so that it gives a more accurate estimate of direct runoff hydrograph at 15-minute intervals.

The new version of SHSAM has been uploaded on the Barr Engineering Company web site (https://www.barr.com/WhatsNew/SHSAM/SHSAMapp.asp) and is available to the public at no charge.

For more information, please contact Omid Mohseni at omm@barr.com.

 

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