Silt Fence Tieback Configuration Design Tool

A Visual Basic (VBA) coded spreadsheet design tool was developed to assist practitioners in the proper design of silt fence tieback systems to be used on highway construction sites.  The tool uses the mathematical concepts outlined (see chapter 2) along with the Soil Conservation Service (SCS) Curve Number (CN) method to determine an adequate tieback spacing that will accommodate a user specified rainfall event. The tool is composed of two components which are (1) the stormwater runoff component and (2) the silt fence storage capacity component.  The details of these two components are outlined (see sections 2.3.1 and 2.3.2) along with an actual field example (see section 2.3.3) where the design tool was used to determine an appropriate tieback configuration on an Alabama Department of Transportation (ALDOT) job site.