habitat model - spawning and rearing habitat refinements about bcfishpass HOT 9 CLOSED

Consolidating, more precisely:

channel width

• streams in river polygons meeting slope criteria should be coded as spawning habitat 5ec5668
• investigate measuring channel width across river polygons https://gist.github.com/smnorris/a94ee9dee346d692953b4431754c90b6

general habitat model connectivity

• include ALL potential rearing habitat DOWNSTREAM of spawning habitats (not just connected rearing habitat) (for that spp)
• include potential rearing habitat UPSTREAM of spawning habitat that is NOT connected IF slope between the rearing/spawning does not exceed 5% (with caveat that there may be an instream distance threshold applied in future)
• consider a maximum distance upstream from spawning habitat for connected rearing habitat to be valid

sockeye specific changes

Start model by modelling rearing habitat:

• potentially accessible lakes > 2 km2

Then model spawning as streams with gradient < .02 and channel width < 50m AND

• immediately upstream of lake OR
• <3km downstream of lake AND slope between stream segment and lake outlet <5%

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Draft wrapped up with 4e3282b but output definitely needs review.

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Estimates of stream area (by individual species/life stage potential) using the newly devised width estimates would be very useful for estimating/visualizing potential habitat gains and allow comparison of m2/$1000 for remediation activities alongside linear m/$1000.

A good example of why this might be so useful in my opinion can be found by comparing a very large stream like Richfield Creek (est. channel_width = 12.5m) with a smaller system such as Coffin Creek (est. channel width 4.75m). For the sake of an example, if we were to imagine that there were impassable falls 1km upstream of both target crossings, there would be far more potential for valuable habitat upstream of the crossing on Richfield Creek vs. Coffin Creek. Photos of habitat in both systems can be viewed through this interactive map.

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@NewGraphEnvironment - good comment but would be better over in #90

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Some QA is needed for rearing upstream of spawning.
See Schippers/Poryphyry (sp?)/Toboggan in BULK

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Review looks reasonable after applying 4d00f93

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Some QA is needed for rearing upstream of spawning.
See Schippers/Poryphyry (sp?)/Toboggan in BULK

having a look at Porphyryr and wondering why all habitat types below barriers upstream of the Hwy is 0?

"SELECT * FROM bcfishpass.crossings
   WHERE stream_crossing_id = '124487'")

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I'm guessing the calculation fails on that one because there aren't any barriers upstream.

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Actually, this deserves a new issue

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