Laserfiche WebLink
i• <br />• <br />• <br />V -Ditch Design Notes <br />1. V -Ditch designs are presented on the following pages Exh8 -29, 29i and 29iii <br />2. V- Ditches are designed using Manning's equation with a constant n =0.03. <br />3. V- Ditches are to be constructed using the depth under minimum grade shown in <br />the tables plus 0.3 feet freeboard. <br />4. Flow depths shown on the tables do not include 0.3 feet freeboard. <br />5. The SEDCAD utility program was used to size rip -rap for ditches with a flow <br />velocity of 6.0 ft/sec or greater. The Simon/OSM - Steep Slope Design and <br />Pader Method were both used to size the riprap. Where the Pader Method was <br />used, 3" was added to the riprap size. <br />II:t16YA <br />A PAP, oV6D & /2i/03 <br />Exh8 - 28 - <br />8/03 <br />