balance
barrage
blue
cascade
chrystal
clean
clear
concept
conservation
conserve
construction
cool
current
curtain
dam
down
drainage
embankment
energy
environment
fall
fast
flood
flow
flowing
hydro
industry
keep
lasher
nature
old
power
protect
protection
rationing
refreshing
reservoir
river
run
saving
scarcity
speed
stone
stream
streaming
swirl
water
waterfall
white