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Last modified
7/14/2009 5:01:46 PM
Creation date
5/20/2009 11:04:46 AM
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UCREFRP
UCREFRP Catalog Number
7911
Author
Platts, W. S.
Title
Validity Of Methodologies To Document Stream Environments For Evaluating Fishery Conditions, (from syposium and species conference on instream flow needs, West. Div. Am. Fisheries Soc., and Am. Soc. Civil Eng., Boise, ID, May 3-6, 1976)
USFW Year
1976
USFW - Doc Type
Proc. Symp. and Spec. Conf. on Instream Flow Needs
Copyright Material
YES
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273 <br />7. Stream order. <br />8. Fish species, fish numbers, and fish lengths. <br />• Channel Materials <br />A given transect crossing the stream channel was divided into 1-foot <br />intervals, and the dominant streambed surface material determined the <br />classification of each 1-foot division (Table 2). <br />Table 2. Size Classification of Channel Materials <br />Particle Diameter Classification <br />12 inches or over (304.8 mm or over) Boulder <br />3 to 11.9 inches (76.1 to 304.7 mm) Rubble <br />0'.19 to 2.9 inches (4.7 to 76.0 mm) Gravel <br />0.18 inch and less (less than 4.7 mm) Fines (Sand) <br />Evaluations of Pools and Riffles <br />Stream areas were stratified as either pool or riffle. The pools were <br />then classified as to their suitability as a fish environment (Table 3). <br />ef__-mti__l.- <br />The conditions and type of each streambank were rated using the total <br />streamside area between each transect in accordance with Table 4. Streamside <br />types refer to habitat types at the intersection of each transect with the <br />banks. <br />Elevation of Streambed <br />Station and transect elevations were read from a hand-held "Thommen" <br />altimeter that was set each morning at an official USGS elevation marker. <br />Transects in areas mapped to 40-foot contours were checked against the <br />altimeter readings for any needed adjustment. The estimated elevation error <br />per station is within +40 feet. <br />Gradient <br />Channel gradients were recorded at each station with a hand-held clinom- <br />eter and equaled the average gradients over each entire 200-foot channel <br />section.
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