Hydrologic Event Codes
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# National Water Information System
# 2024/10/03
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# Date Retrieved: USGS Water Data for the Nation Help System
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hyd_event_cd hyd_event_nm
1s 27s
1 Drought
2 Spill
3 Regulated flow
4 Snowmelt
5 Earthquake
6 Hurricane
7 Flood
8 Volcanic action
9 Routine sample
A Spring breakup
B Under ice cover
C Glacial lake outbreak
D Mudflow
E Tidal action
F Affected by fire
H Dambreak
J Storm
K Backwater
L Algal bloom
X Not applicable
Z Not Determined (historical)