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?