ALP 3

Contents
successive 7 in hose clamps. The buckets and nets were held in position by galvanized steel
hanger strap and concrete wedge anchors embedded into the shotcrete substrate (figure 14).
Figure 13. Entrainment nets made from 500- micron Nitex® nylon screening material designed
to screen plankton size particles from water.
Figure 14. Five -gal plastic bucket used for the cod -end of the entrainment net (` /a in holes were
drilled into one -half to vent water upwards and screened inside with 500- micron screen)
and held in position by galvanized steel hanger strap and concrete wedge anchors
embedded into the shotcrete.
To keep the cod end of the entrainment nets from becoming dewatered, the lower section of the
two 48 in culverts that drain the spillway area were blocked with 2 x 10 in boards, this built up a
pool of water that submerged the lower section of the entrainment nets and all of the cod end
section during the test and for about 15 minutes after the flow was shut down (figure 15).
Figure 15. Spillway area with 48 in drain culverts in background (left picture) and pool of water
remaining by 2 x 10 in board dam after the discharge is shut down (right picture).
Page 23