Time Datum Reliability Codes
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# National Water Information System
# 2024/12/04
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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