500yr Storm Rainfall Depth 1

[davidpro]

Anyone know where I can find information regarding 500yr rainfall depths in the southeast? Everywhere I look only provides info up to the 100yr storm. I'm analyzing a stream in HEC-RAS where I'm going further upstream than the established FEMA map, so I have to come up with the flows to my upstream cross-sections. There is a fork in the channel upstream of where the effective map stops, so I don't want to use the last FEMA flow for both branches, and I imagine FEMA will want something more detailed than splitting the flow in half or some equivalent of that. Any ideas? Thanks,

 

[cvg]

NOAA may provide the information - if not available on the data server, they may still be able to provide you with printed information.

http://hdsc.nws.noaa.gov/hdsc/pfds/

 

[davidpro]

Perfect, that's it! Thanks

 

[TerryScan]

Be sure to check what flow data FEMA wants you to use. Typically, they prefer flows from Regression analysis over Hydrologic modeling.