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analysis aquatic Average annual bankfull stage basic fixed sites basin length Basin relief biological canopy angle canopy closure characterization clinometer collected Computation-method list circle correlation densiometer determine distance downstream link drainage area drainage basin Drainage density elevation environmental estimated example Field Form flood plain flow GCU's geomorphic habitat characteristics Habitat cover habitat data dictionary hydrologic ISOHYET kilometers Leopold meander measurements method national data aggregation NAWQA national data NAWQA Program NAWQA Study Units NGVD Once All reaches Once per HIP open canopy PBS PBS perennial stream points pool riffle run reach boundary reach length reaches PBS record reference location relief ratio required for NAWQA riparian vegetation riparian zone sampling scale sediment segment sinuosity Source-map-scale list circle spatial Station identification Strahler stream order stream gradient stream habitat stream length stream order streamflow surface synoptic sites thalweg transect U.S. Geological Survey upstream USGS variables velocity water-surface gradient