swales filled with fractured rocks
swales filled with fractured rocks
(OP)
One local ski area has developed swales in their dirt parking lot. These swales are filled with fractures rocks around 6" to 8" at their longest dimensions. The surfaces of the rocks are even with the swale surfaces. Swales are about 5' wide at surface and perhaps 1' deep. Which equation would be appropriate to calculate drainage flow. I am thinking of Manning's equation with an appropriate roughness factor but looking at these swales, we do not have open channels. Please comment.





RE: swales filled with fractured rocks
This is an over simplified way to estimate a flow. Due to the random placement, varying stone size, embedment depths, etc it would be near impossible to estimate a hydraulic radius within the channel and or consistent flow area between the stones. Also, flow chracteristics would change quite frequently between critical and subcrtical.
Hopefully this helps.
RE: swales filled with fractured rocks
RE: swales filled with fractured rocks
RE: swales filled with fractured rocks
Richard A. Cornelius, P.E.
WWW.amlinereast.com