tailwater

noun 0.673

mill race

noun 0.595

sluiceway

noun 0.583

headrace

noun 0.567

raceway

noun 0.560

surface discharge

noun 0.539

trotline

noun 0.531

spillway

noun 0.531

tailing

noun 0.528

tidal river

noun 0.527

outfall

noun 0.525

trailing

noun 0.525

sluice

noun 0.524

ratline

noun 0.521

runnel

noun 0.519

tramline

noun 0.516

water tunnel

noun 0.515

runout

noun 0.512

trailing edge

noun 0.510

tail

noun 0.509

fish ladder

noun 0.508

tailpiece

noun 0.507

tideway

noun 0.504

racetrack

noun 0.504

drainpipe

noun 0.501