| Habitat Type |
Description |
| Pools |
Still water, low velocity, smooth, glassy surface, usually deep compared to other parts of the channel.
Pool Types:
| Plunge Pool (PP) |
Pool at base of plunging cascade or falls. |
| Trench Pool (PT) |
Pool-like trench in the center of the stream. |
| Lateral Scour Pool (PL) |
Pool scoured along a bank. |
| Backwater Pool (PB) |
Pool separated from main flow off the side of the channel. |
| Impoundment Pool (PD) |
Pool formed by impoundment above dam or constriction. |
| Pool (P) |
Pool (unspecified type). |
|
Glide (GL) |
Water moving slowly, with a smooth, unbroken surface. Low turbulence. |
Riffle (RI) |
Water moving, with small ripples, waves and eddies -- waves not breaking, surface tension not broken. Sound: "babbling", "gurgling". |
Rapid (RA) |
Water movement rapid and turbulent, surface with intermittent whitewater with breaking waves. Sound: continuous rushing, but not as loud as cascade. |
Cascade (CA) |
Water movement rapid and very turbulent over steep channel bottom. Most of the water surface is broken in short, irregular plunges, mostly whitewater. Sound: roaring. |
Falls (FA) |
Free falling water over a vertical or near vertical drop into plunge, water turbulent and white over high falls. Sound: from splash to roar. |
Dry Channel (DR) |
No water in the channel. |
| Substrate Types |
Size Description |
| Bedrock (smooth) |
Larger than a car |
| Bedrock (rough) |
Larger than a car |
| Boulder |
250 to 4,000 mm - from size of a basketball to the size of a car |
| Cobble |
64 to 250 mm - from size of a tennis ball to the size of a basketball |
| Gravel (coarse) |
16 to 64 mm - from size of a marble to the size of a tennis ball |
| Gravel (fine) |
2 to 16 mm - from the size of a ladybug to the size of a marble |
| Sand |
0.06 to 2 mm - gritty to the size of a ladybug |
| Silt/Clay/Muck |
Not gritty |
| Hardpan |
Firm, consolidated fine substrate |
| wood |
Any size |
| Other |
Any other substrate material |
