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500yr Storm Rainfall Depth

500yr Storm Rainfall Depth

500yr Storm Rainfall Depth

(OP)
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,

RE: 500yr Storm Rainfall Depth


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/

RE: 500yr Storm Rainfall Depth

(OP)
Perfect, that's it!  Thanks

RE: 500yr Storm Rainfall Depth

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

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