small doc edits

README.md

@@ -58,14 +58,10 @@ All scripts presume that the `DATABASE_URL` environment variable points to your
 
 Once the database is created, load requirements `fwapg` and `bcfishobs` as per instructions in the respective projects.
 
-With `fwapg` and `bcfishobs` loaded to your database, set up the `bcfishpass` schema/tables/functions:
-
-    cd db; ./setup.sh
-
 
 ## Usage
 
-To build all models:
+With `fwapg` and `bcfishobs` loaded to your database, build `bcfishpass`:
 
     make
 

docs/03_model_habitat_linear.md

@@ -0,0 +1,12 @@
+(linear_habitat)=
+# Linear habitat model
+
+Streams accessible to fish may be suitable for spawning or rearing, or may only be used as movement corridors to reach such habitats. When estimating fragmentation, the amount of usable spawning or rearing habitat is of greater interest than the amount of corridor habitat. In addition to modelling barriers to fish passage, `bcfishpass` models the intrinsic potential (IP) of streams to support spawning or rearing activities for several species (Pacific Salmon, Steelhead, Bull Trout, Westslope Cutthroat Trout).
+
+Linear habitat IP modelling is currently based on:
+
+- channel width or discharge (depending on modelling requirments and/or data availability)
+- stream gradient
+- connectivity (rearing streams must be connected to spawning streams)
+- other species specific criteria
+