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Time Datum Reliability Codes

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# National Water Information System
# 2017/12/17
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# Date Retrieved: USGS Water Data for the Nation Help System
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tm_datum_rlblty_cd	tm_datum_rlblty_nm	tm_datum_rlblty_ds
1s	11s	39s
E	Estimated	Estimated (assumed) time datum
K	Known	Known time datum
T	Transferred	time datum assumed during data transfer