POOL/GLIDE AND RIFFLE/RUN QUALITY METRIC:

This metric describes the characteristics of areas with the slowest and fastest currents.

Pools and glides are areas of slow current. Both are typically bowl-shaped features in the stream bed, and they are often the areas of greatest stream width. Pools do not show much, if any current at the surface; glides show slow steady movement.

Riffles and runs are areas of rapid and turbulent movement. Riffles are typically fairly shallow and show the most turbulent movement in the stream, where the water moves over rocks or uneven bedrock bottom. Runs may be deeper and show turbulent flow over an uneven bottom.

MORPHOLOGY

Shape of pools when compared with riffles, or the relative widths of pools and riffles.

• The following choices are included in the QHEI Pool/Glide And Riffle/Run Quality metric:



• Pool Width is Greater Than Riffle Width
• Pool Width is Equal to Riffle Width
• Pool Width is Less Than Riffle Width

Pool Width is Greater Than Riffle Width [2] Morphology QHEI Metrics NORP Main Menu

Pool Width is Equal to Riffle Width [1] Morphology QHEI Metrics NORP Main Menu

Pool Width is Less Than Riffle Width [0] Morphology QHEI Metrics NORP Main Menu