Water engineer here. The standard approach is to 1) get the storage vs.
elevation data from the designers of the reservoir or, barring that, 2)
get the bathymetry data from USBR or state DWR, or, if available, get
the DEM data from USGS if the survey was done before the reservoir was
built or 3
Nick,
I've also made colors transparent by pasting the hex equivalent of, say,
0.3*256 = 76.9 to the hex color code. e.q. for black it might be
"#004d" and the 4d is 77 in hex. That way you don't need to convert
back and forth so much. If col is "#00" the transparent version is
tcol <-
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