> what is a backhoe trench <
Just a trench, dug with a backhoe.
A test pit or backhoe trench can be more economical than soil borings and gives you a visual cross section of the soil.
- Dennis
--
Victory at all costs, victory in spite of all terror, victory however long and hard...
I can't cite you a reference, but I remember downloading some reports from the Texas DOT site.
- Dennis
--
Victory at all costs, victory in spite of all terror, victory however long and hard the road may be; for without victory there is no survival.
-Sir Winston Churchill
Are you referring to the Bulletin 70 / Huff distribution rainfall? You can do that with TR-20, which is Public Domain. You must manually enter the rainfall tables. Generally, you must run all four quartiles to see which is the worst.
-Dennis Novak
Run Fast Bite Hard
RCP with 5 to 10 feet of cover is a pretty routine installation. Why are you embedding it in concrete? Is there a special load condition which you are encountering?
We normally use compacted, granular bedding to the springline for routine pipe installation. This is generally consistant...
Have you tried the local precast products vendors? IMX, the same guys that sell concrete pipe and manholes sell end sections and stuff.
- Dennis Novak
Run fast. Bite hard.