RIFFLE

Shallow rapids in an open stream.

RIFFLE HABITAT

A stream segment where moderate water velocity and substrate roughness produce moderately turbulent conditions that break the surface tension of the water and may produce breaking wavelets that turn the surface water into white water.

RIGOUROUS & EXPERT-LED

Gold Standard technical governance shall be expert-led and focus on quality of outcome (for standards and methodologies) or on accuracy (for assurance and oversight).

RILLS

Small grooves, furrows, or channels in soil made by water flowing down over its surface; also another name for a stream – usually a small stream.

RIP RAP

A layer of man-made hard, durable material for bank protection and stabilization usually consisting of rock or stone.

RIPARIAN

Pertaining to the banks of a river, stream, or other body of water as well as to plant and animal communities along such bodies of water.

RIPARIAN BUFFER

A vegetative zone next to a perennial or intermittent water body, which help shade and protect the water body from the impact of adjacent land uses.