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Grade Code

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# National Water Information System
# 2019/09/16
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# Date Retrieved: USGS Water Data for the Nation Help System
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grade_cd	display_nm
2s	100s
-1	UNSP
-2	UNUSABLE
0	UNDEF
4	Statistic computed from less than expected number of instantaneous values for the period
50	DEFAULT
90	Daily mean calculated from data on this day matches published daily mean to nearest hundredth
91	Daily mean calculated from data on this day matches published daily mean within 1 percent
92	Daily mean calculated from data on this day matches published daily mean within 5 percent
93	Daily mean calculated from data on this day matches published daily mean within 10 percent
99	Value considered correct but published daily mean value does not exist and or no comparison was made