Posted by jrh009 on November 29, 2011 at 16:17:50 from (66.225.176.120):
In Reply to: Culvert installation posted by John T on November 29, 2011 at 10:33:17:
Quoting Removed, click Modern View to see
To determine the proper size you have to analyze the total net drainage area and then apply a 50 yr storm event . This gives you capacity. Then you select dia and slope of the pipe to determine flow rate. Also a consderation is the pipe material for resistance. Slope is a major factor!
Cover over the pipe is only a structural issue to prevent pipe crushing so it is related to wheel load. If you do not have a structural pipe you need a minimum of the pipe dia over the top of the pipe. The pipe needs to be bedded in granulars to the spring line of the pipe as a min. and compacted to 100%.
If you do not have the hydraulics worked out then I would install the culvert such that I could create a spillway in the roadway surface of armor stone on one side of the culvert. In the event of higher design load the water simply by passes over the spillway and does not erode the material around the culvert.
Hope this makes some sense to you, it is not an eyeball calc. Topo maps are a great aid for seeing the total drainage area
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