Riffle/run quality

Rated based on the depth, complexity, and functional importance of riffle/run habitat in the segment, with highest scores assigned to segments dominated by deeper riffle/run areas, stable substrates, and a variety of current velocities.

0 - 5Riffle/run depth < 1 cm; or riffle/run substrates concreted
6 - 10Riffle/run depth generally 1-5 cm; primarily a single current velocity
11 - 15Riffle/run depth generally 5-10 cm, variety of current velocities
16 - 20Riffle/run depth generally >10 cm, with maximum depth greater than 50 cm (maximum score); substrate stable (e.g. cobble, boulder) & variety of current velocities

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