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Taking the Leap to Engineering
Nick Wark, P.E., CFMHydraulics Engineer
March 31, 2015
Where is Precipitation Data Found?
• TP-40 – 1961• NRCC (Precip.net) – 2010
NRCC – TP40 10‐year 24‐hour, percent more or less
*Slide taken from www.precip.eas.cornell.edu
NRCC – TP40 25‐year 24‐hour, percent more or less
*Slide taken from www.precip.eas.cornell.edu
NRCC – TP40 100‐year 24‐hour, percent more or less
*Slide taken from www.precip.eas.cornell.edu Documentation
Q2 = 0.237A 0.860W -0.291 P 1.774
USGS (2014)
A – Drainage AreaW – Percentage wetlandsP – Basin wide average annual
precipitation(PRISM 1981)
Moving Forward• Large Watersheds
o USGS Regression
• Small Watershedso Still need precipitation data
• NOAA Atlas 14?
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