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CE
394K.2 Hydrology &nb=
sp; &n=
bsp; Homework
#3  =
; &=
nbsp; &nbs=
p; Spring
2010
An ArcGIS personal geodatabase containing rainfa=
ll
for January 27 through February 1, 2010, over the United States and some
geographic data for reference is obtainable at:
http://www.ce.utexas.edu/prof/maidment/GradHydro2010/Nexrad/rain=
fall.gdb.zip
The contents of this geodatabase include:=
o:p>
The precipitation data contained in this geodata=
base
were downloaded from the National Weather Service’s Advanced Hydrolog=
ic
Prediction Service download page at http://water.weather.gov/dow=
nload.php as a shape file for each calendar =
day
with dots at the center of each Nexrad cell, and values for daily rainfall
given as “Globval” in inches.
(1) There
was heavy rainfall over Texas on January 29:
Prepare
a map of the rainfall depth in inches for Texas for January 29. If you have not taken my GIS in Wa=
ter
Resources class, please buddy up with somebody in the class who has taken t=
hat
course and work with them to achieve this goal.
(2) The
watersheds from the Watershed Boundary Dataset (WBD) and USGS Gages are sho=
wn
below in the San Marcos basin. It
turns out that the WBD watersheds rather nicely define the drainage area of=
the
USGS gage on the Blanco River at Wimberley, Texas, USGS Gage 08171000.
Develop
a daily rainfall hyetograph for the watershed of the Blanco River at Wimber=
ley
for the period January 27 through February 1, 2010. What volume of water fell on the watershed (m3) during t=
his
period?
(3)
Below is shown a hydrograph of the outflow from the Blanco River at
Wimberley. These data were ob=
tained
from http://waterwatch.usgs.gov/
Obtain the corresponding discharge data and plot the flow hydrograph for the =
period
January 27 through February 1, 2010.
What volume of water (m3)
flowed through the gage site during this period?
(4) Solve problems 3.2.1 and 3.2.5 in =
Applied
Hydrology
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