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# National Water Information System
# 2024/04/18
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# Date Retrieved: USGS Water Data for the Nation Help System
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chan_mat_cd	chan_mat_nm	chan_mat_ds
4s	24s	96s
silt	siltmud	
unkn	unknown	
UNSP	Unspecified	The channel bed material was not specified.
SAND	sand	The channel bed was composed of sand.
GRVL	gravel	The channel bed was composed of gravel.
CBLS	cobbles	The channel bed was composed of cobbles.
BLDR	cobbles-boulders	The channel bed was composed of cobbles and/or boulders.
LDGE	bedrock-ledge-artificial	The channel bed was composed of bedrock, ledge or an artificial material like concrete or metal.