9473

• UCREFRP Catalog Number: 9473
• Author: Anderson, R. and G. Stewart.
• Title: Riverine Fish Flows Investigations.
• USFW Year: 2001.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

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in terms that distinguish between good, poor and unsuitable conditions for each species and

age groups. A value can be assigned to each combination of depths and velocity to indicate

the relative value of that condition for fish. Habitat types, defined by depth and velocity

criteria are mapped at each flow for statistical analysis of surface area and distribution. As a

starting point, sixteen habitat types were defined for analysis of habitat availability (Table 1).

Pools had a velocity of zero to 0.15 m/sec and had five differing depths from very shallow (<

0.2m) to deep (>2m). The velocity of runs ranged from 0.15 to 0.6 m/sec and depths were the

same as for pools. Riffles had velocity ranging from 0.6 to 1.5 m/sec and rapids had

velocities over 1.5 m/sec.

Table 1. Depth and velocity criteria used to define meso-habitat types.

Habitat Types Depth Velocitv
(m) (m/s)
Wetted sand 0.01 - 0.2 < 0.15
Shoal pool 0.2 - 0.5 < 0.15
Shallow pool 0.5 - 1.0 < 0.15
Medi -pool 1.0 - 2.0 < 0.15
Deep pool > 2.0 < 0.15
Wetted run .01 - 0.2 0.15 - .6
Shoal-run 0.2 - 0.5 0.15 - .6
Shallow run 0.5 to 1.0 0.15 - .6
Medi-run 1.0 to 2.0 0.15 - .6
Deep run > 2.0 0.15 - .6
Shallow riffle < 0.2 0.6 - 1.5
Riffle 0.2 to 0.5 0.6 - 1 .5
Deep riffle 0.5 to 1 .0 0.6 - 1.5
Very deep riffle > 1.0 0.6 - 1.5
Shallow rapid < 0.5 > 1.5
Deep rapid > 0.5 > 1.5

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