It seems to me that the 5-point distribution PMP can be utilized in determining the PMF for small watersheds (10 mi2 or less). I assume that PMP6 (6 hour PMP) in the equation can be read directly from Figure 18 (D.A.=10 mi2) of the NOAA/ACOE Hydrometeorological Report 51 (if east of 105th...
Is anybody familiar with a method of calculating the probable maximum flood? It's a dam site in New York State, Putnam County. I was able to locate a "rule of thumb" procedure used in the past (30-40 years ago) in the ACOE Phase 1 dam evaluations but I'm not sure if it's still valid. I will...
I'm doing a waterway analysis using HEC-RAS.
An increase of the channel crosssections in a certain reach of the stream leads to lower velocities but an increase of the water surface elevations. I can't really explain why the water surface is higher. Can anybody help?
Thanks.
I'm modeling an 11 sq. mile watershed using WinTR-20 for the first time. The drainage area at an existing dam is 6 sq.mile. Approx. 1,500 feet downsream of the dam there is highway crossing A (D.A.=7 sq. miles). Approx. 6,000 feet from highway crossing A there is another crossing, let's call it...
It appears that detention basins located in the lower sections of a watershed are not necessary. They might even be detrimental because of peak discharge increase.
For a 12 square mile watershed what kind of analysis can be performed in order to identify the lower section of the watershed where...
