Answer Happy

a. Trace the boundary of the watershed upstream of the point
(A). Do this directly on the image and/or with graph paper and
estimate the drainage area (A) in m2 of the catchment upstream of
point A.
b. Upstream of point A and downstream of the obvious tributary
junction in the catchment (Figure 2), estimate the channel width
(w) in 5 to 10 locations. What is the mean channel width?
c. It turns out that the smart folks at NASA outfitted the
Cassini satellite with a stereo imaging system. Consequently, we
know that the elevation of the white-ish regions in the headwaters
of our catchment are approximately 150 m higher than the point
labeled A (Figure 2). Using this information, estimate the channel
slope (S) of the river.
100 m Figure 2: Blow-up of channel system shown in Figure 1. Note that the point A. is the same in both images