I'm not sure if there is such a thing as "worst case n." In my limited experience, the biggest impact of roughness in overland flow is in estimating time of concentration, which influences the design storm and timing of peak flow.
choosing a .025 or .05 (the ends of the spectrum) based on one...
My first question if a subdivision was in the watershed area for row crops would be how are the fields irrigated and drained? (especially is there a drainage ditch and what is the capacity?) You are probably already looking at that, but I think that is far and away a more influential detail...
Another option may be to use Railroad ties or bridge beams. There is a contractor near me that sells them for a reasonable price; perhaps there is something similar near you.
I've bought their stuff before. The #1s look really really nice, and the #2s pretty good (they could be hidden on your...
Order of precedence list for WDYOT is in their standard specifications.
Interesting it is that the order of precedence is in a document near the bottom of the precedence list.
If the list is omitted from the "Project Manual" or "Contract Documents," I guess this would be the default list...
Some specifications for cementitious grout include "The grout shall be segregate," which I don't understand.
Initially I thought it was a typo of "The grout shall not be allowed to segregate but a google search brings up examples including that go back at least as far as 2013...
