Poor/Glide and Riffle/Run

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Presentation transcript:

Poor/Glide and Riffle/Run Deeper pool = better pool Deeper riffles & runs = better quality Diversity of current velocities available Mophology of riffles/pools affects characteristics and quality

Riffle-Pool Morphology

Current Velocities in Streams Fast/Very Fasts Fast Eddy Moderate Slow

QHEI Riffle/Run Metric If best areas < 5cm or no riffle, metric scores a zero

Riffle/Run Characteristics What is depth of better riffle and run areas? Measure depths in areas that are clearly run or riffle Are substrates coarse or fine? Are substrates in riffle/run area embedded?

Darters and Riffle Depth

Calculating Stream Gradient: “Map Gradient” Locate site on topo map Find upstream and downstream contour line crossings Calculate miles between contours E.g. 640’ – 630’/1.5 miles = 6.67’/mile

Large, Fast, Deep Riffles Low Embeddedness