Hydrologic Event 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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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)