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NOAA Fisheries
Geographic Information Systems
Salmon Habitat Potential

Salmon Habitat Potential

Intrinsic potential (IP) provides an estimate of relative habitat potential inferred from attributes of channel size (based on estimated mean annual flow), channel gradient, and the valley-width index (the ratio of channel to valley width) as inferred from a DEM. Using the CLAMS model (Burnett .), intrinsic potential IP is defined as

IP = (I FLOW *I GRADIENT *I VWI ) 1/3 . (1)









Here IFLOW , IGRADIENT , and IVWI are the rankings based on mean annual flow, channel gradient, and valley-width index, respectively. Each varies between zero and one as shown if Figure 1.


Figure 1. Functional relationships used to define Intrinsic Potential (IP); IFLOW: f1, f2, f3, and f4 are user-specified values currently set to 0.01, 0.06, 21.24, and 76.45 m3/sec; IGRADIENT: Here g1 and g2 are user-specified values currently set to 0 and 0.05, respectively; IVWI: VWI1 and VWI2 are user-specified values currently set to 3.31 and 7.4.

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