Talk:750.7 Non-Hydraulic Considerations

750.7.8 calls for Safety Slope End Sections on all drainage pipes greater than 21 in. that fall within the clear zone.

This seems overly conservative as the 2006 Roadside Design Guide (RDG) 3.4.2.1 states "If a foreslope is traversable, the preferred treatment for any cross-drainage structure is to extend (or shorten) it to intercept the roadway embankment and to match the inlet or outlet slope to the foreslope. For small culverts, no other treatment is required." The RDG goes on to define a small pipe culvert as a single pipe up to 36" or a battery of pipes up to 30".

Why are we so much more conservative than the RDG?

--Martik2 13:43, 23 March 2009 (CDT)