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Nick Chisholm
Barriers to fish migration in the River Annan Catchment
Code Easting Northing HeightNatural? Length Width Shape
Depth DS
Depth US
Debris Y/N
M/S flow
Dark Y/N photo passability
ewdk1 302603 606583 0no 9 0.7
round corrugated 0.15 0.02
yes forms dam ds 1.4n yes 1
ewdk2 302589 606562 0.85no 0 1.95 0.03 0.18yes 1.6 yes 3
ewdk3 302574 606614 0.4no 7 0.6round smooth 0.5 0.2
downstream 10m natural no yes 3
ewcf5 302227 606947 ford 1
ewcf6 301937 607053 no 20 0.88
round smooth culvert 0.02 0.11
yes tree blocking culvert 2.2n yes 3
ewcf8 301957 606907 no 10 0.45round smooth 0.08 0.01 no 3
ewbt1 301570 606955 yes
ewcf7 301570 606955 yes
ewcf9 301758 607305 yes
ewcf10 301605 607387 yes
ewcf11 301558 607411 yes
ewcf12 301303 607397 0.18no 15 1.3roundsmooth 0.15 0.02no 1.6n yes 2
ewjd12 301300 607365 0.15 15 1.25round smoth 0.3 0.01 1.6no 2
Criteria Score Score Score
Height<0.4m
1 0.4m-1m 2>1m
3
*Depth on
Barrier>0.1m 1 0.05-0.1m 2 <0.05m 3
Depth D/S>2x deep as
height1
0.25 - 2x deep
as height2 <0.25x height 3
Flow <2m/s 1 >2m/s 3
Barrier Assessment - Criteria for Trout Passage in Small Burns.*Depth of plunge pool downstream only measured on barriers between 0.4 and 1mScore of 1 means passableScore of 2 means passable only under certain flowsScore of 3 means likely to be impassableThe score is the highest single score on the measurements