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Beaver habitat
Field name = [BeavHab]
The potential for beaver (Castor canadensis) habitat. Favorable habitat (1); non favorable habitat (0).
The potential locations of beaver habitat is predicted based on an empirical model of beaver dams based on data from the Stilliguamish River basin, Washington (Pollock et al. 2004). The model uses a slope-area threshold of 0.3 km2, corresponding to a value of 2,000 Joules per second per meter for stream power at bankfull discharge. NetMap calculates stream power as:
SP = pgQs, where SP is stream power, p is specific weight of water (1000 kg/m3), g is acceleration of gravity (9.8 m/s2), discharge at bankfull depth (approximately two year flood, m3/s) and S is the channel gradient (L/L).
Pollock, M.M., G.R.Pess, T,J. Beechie and D.R. Montgomery. 2004. The importance of beaver ponds to coho salmon production in the Stillaguamish River Basin, Washington, USA. North American Journal of Fisheries Management 24: 749-760
