"I recognize the right and duty of this generation to develop and use our natural resources, but I do not recognize the right to waste them, or to rob by wasteful use, the generations that come after us." - Theodore Roosevelt, speech, Washington, D.C., 1900
A new USGS report describes methods
for estimating flood discharges at ungaged stream sites in Montana for various
recurrence intervals. Plug in some simple numbers (drainage area, annual precipitation, active channel width, etc.) and determine the flow volumes your culvert will need to accomodate. Go to USGS Flood Discharge Program
310 Stream Permits 