Rainfall Averaging Methods

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Presentation transcript:

Rainfall Averaging Methods From Bedient

From Dingman, 1994

From Dingman, 1994

RADAR Rainfall Estimates NEXRAD provides real-time data on a ~16 km2 (6 mi2) grid Each estimate represents an average rainfall amount over the entire 4 x 4 km2 area NEXRAD rainfall estimates compare well with point rain gage measurements (r2 ~ 0.9) From Bedient

World Record Rainfall Amounts From Dingman, 2002

Logarithmic - probability plots of depths of 1-, 6-, and 24-hr rainfall data From Dingman, 1994

Depth – Duration – Frequency plot

From Brutsaert, 2005

NOAA Hydrometeorological Design Studies Center Precipitation Frequency Data Server (PFDS) http://hdsc.nws.noaa.gov/hdsc/pfds/ The standard source for design storm data CEE 3430 – Spring 2011

Reduction of point rainfall for application to drainage area From NOAA Atlas 2 http://www.nws.noaa.gov/oh/hdsc/PF_documents/Atlas2_Volume5.pdf