The costs of a new structure are quite variable.
Costs vary greatly with drainage area, storm frequency and intensity. Attempting to safely route a large storm, say 50 year event, on a large drainage can be costly. However, if smaller drainages with dependable water flow are available, the structure will be much simpler, safer and less costly. Also a 50 year storm event in Illinois is quite different from the same storm in Nebraska or Wyoming.
The paticulars on this structure:
1) Contributing drainage area - 1300 acres
2) Intermittent stream flow - 10 mo./ yr. @ about 400 gpm.
3) Compacted earth fill including core & stripping - 8483 cubic yds. Cost $8483.00
We did some trading here, therefor only $1.00/yd.
4) 13 ft., 30inch dia. riser (cmp pipe)
110 ft., 18 inch dia pipe barrel (cmp pipe)
54 ft., 10 inch dia drawdown pipe w/alfalfa valve & "varmit" protection. (cmp pipe)
Total costs for steel pipe delivered 100 miles from Casper WY. $4500.00
5) 180 ft. 4 inch schedule 40 pvc pipe. (toe drain)
Cost $500.00
6) Backhoe work on core trench, stump removal, etc. Cost $1000.00
7) Labor: gather close friends, family and provide lots of cold drinks and rib-eyes over about 8 days. Labor was rotated as their time permitted.
Total Costs approximate: $15000
Hope this helps.
Ed
