"VARIABLE"	"DESCRIPTION"	"SAMPLE_TYPE"	"UNITS"	"RANGE_LOW"	"RANGE_HIGH"	"LEGAL_VALUES"
"AGGR_ECO9_2015"	"NARS 9-level reporting region (2015), based on aggregated Omernik Level III ecoregions: CPL=Coastal Plains; NAP=Northern Appalachians; NPL=Northern Plains; SAP=Southern Appalachians; SPL=Southern Plains; TPL=Temperate Plains; UMW=Upper Midwest; WMT=Western Mountains; XER=Xeric West."					
"BENT_MMI_COND"	"Condition class based on benthic MMI score"	"BENT"	""			"Good|Fair|Poor|No Data"
"BENT_SAMPLE_TYPE"	"Sampling method used to collect macroinvertebrates"	"BENT"	""			"BERWW|BELGB|"
"BURRPTAX"	"% burrower taxa, based on WSA autecology"	"BENT"	""	0	100	""
"CHIRPTAX"	"% Chironomidae taxa"	"BENT"	""	0	100	""
"CLNGNTAX"	"Number of distinct clinger taxa, based on WSA autecology"	"BENT"	""	0		""
"CLNGPTAX"	"% clinger taxa, based on WSA autecology"	"BENT"	""	0	100	""
"COMP_PT"	"Metric score for composition metric"	"BENT"	""	0	10	""
"DATE_COL"	"Date of field collection"					
"DIVS_PT"	"Metric score for diversity metric"	"BENT"	""	0	10	""
"DOM5PIND"	"% individuals in dominant 5 taxa"	"BENT"	""	0	100	""
"EPHENTAX"	"Number of distinct Ephemeroptera taxa"	"BENT"	""	0		""
"EPHEPTAX"	"% Ephemeroptera taxa"	"BENT"	""	0	100	""
"EPT_NTAX"	"Number of distinct Ephemeroptera, Plecoptera, and Trichoptera taxa"	"BENT"	""	0		""
"EPT_PIND"	"% Ephemeroptera, Plecoptera, and Trichoptera individuals"	"BENT"	""	0	100	""
"EPT_PTAX"	"% EPT taxa"	"BENT"	""	0	100	""
"FEED_PT"	"Metric score for functional feeding group"	"BENT"	""	0	10	""
"HABT_PT"	"Metric score for habit"	"BENT"	""	0	10	""
"HPRIME"	"Shannon diversity, where prop_i=proportion of species i in sample"	"BENT"	"NONE"	0		""
"INTLNTAX"	"Number of distinct intolerant taxa"	"BENT"	""	0		""
"MMI_BENT"	"Benthic MMI score"	"BENT"	""	0	100	""
"NOINPIND"	"% non-insect individuals"	"BENT"	""	0	100	""
"NTOLNTAX"	"No. of non-tolerants (PTV<6) taxa"	"BENT"	""	0		
"NTOLPTAX"	"% taxa with pollution tolerance score between 0 and 5.9"	"BENT"	""	0	100	""
"OE_COND"	"Condition class based on O/E score"	"BENT"	""			"GOOD|FAIR|POOR|NO DATA"
"OE_SCORE"	"O/E score for benthic sample"	"BENT"	""	0		""
"RICH_PT"	"Metric score for taxa richness"	"BENT"	""	0	10	""
"SAMPLE_TYPE"	"Sample type"					
"SAMPLED_BENT"	"Indicator of sampling at site"	"BENT"	""			"SAMPLE_LOST|YES|YES_NOINVERTS"
"SCRPNTAX"	"Number of distinct scraper taxa, based on WSA autecology"	"BENT"	""	0		""
"SHRDNTAX"	"Number of distinct shredder taxa, based on WSA autecology"	"BENT"	""	0		""
"SITE_ID"	"Site identification code"					
"STOLPTAX"	"% taxa with pollution tolerance score between 8 and 10"	"BENT"	""	0	100	""
"TOLR_PT"	"Metric score for tolerance metric"	"BENT"	""	0	10	""
"TOLRPTAX"	"% Tolerant (PTV>=7) taxa"	"BENT"	""	0	100	
"UID"	"Unique site visit ID"					
"VISIT_NO"	"Visit number for that year"					
"YEAR"	"Sampling year"