Management of Commercially Generated Radioactive Waste - U.S. ...

70
600 -
150
500 -
F.6
40
=30
20
CL 10-
00 - 95 96 97 98 99 100
PERCENT OF IME FLOW HAS
M3 BEEN EQUALED OR EXCEEDED
200 -
100
0 10 20 30 40 50 7 80 W 90 l
PERCENT OF TIME FLOW HAS BEEN EQUALED OR EXCEEDED
FIGURE F.4.3. River Flow Duration Data for R River
at the Reference Site
The 1-in-1000-year flood is expected to reach 281 m MSL (mean sea level), and the max-
imum flow of record (1965) is estimated to have reached 279 m MS1. Normal river stage in
the vicinity of the site is about 276 m MSL, and the site grade is 300 m MSL.
A study was conducted to determine the predicted flood discharge flow and water level
at the site resulting from the "maximum probable flood" as defined by the U.S. Army Corps
of Engineers. The "maximum probable flood" was estimated as 10 million R/sec with a cor-
responding peak stage of elevation 286 m MSL at the reference site. The peak level at the
site would be reached in about 12 days from the onset of the worst combination of conditions
resulting in the "maximum probable flood."
The R River water's chemical characteristics are given in Table F.4.1.
The nearest domestic water supply reservoir is the G Water Works Reservoir. This res-
ervoir is located in northern G and is fed by the R River from an intake about 64 km down-
stream from the reference site area. (This water supply serves about 1.8 million people)
The ground-water table under normal conditions is higher than the river; thus ground
water and runoff drain to the river. There are numerous shallow wells supplying residences
and farms along the river terrace. The closest public water supply well is the A city well,
which obtains water 72 m below ground level.