I commonly use the USBLM ...

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I commonly use the USBLM published, "R-1 STREAM REACH INVENTORY" survey method to determine runoff production volumes.  It is, by far, the most comprehensive and well respected method I have found.  It was devised by the USBLM in cooperation with the USDA and USGS.  It is available from the US government printing and publications agency for a nominal price.