water scale
environmental
above
alone
black
dam
depth
detail
device
drought
environment
flood
gauge
high
indicator
irrigation
lake
level
level indicator
level scale
lined
lines
low
mark
marker
measure
measurement
meter
monitor
outdoors
outside
pillar
pole
pond
reservoir
restriction
river
rule
ruler
scale
shortage
sign
vertical
water
water level
water pole
wave
wind
wood
yellow