The lake is naturally regulated by mountain streams and waterfalls so it is always at optimum water level.
(The lake; is naturally regulated; by mountain streams and waterfalls; so it is always at optimum water level) (it; is; T:always; at optimum water level)
The lake it
is naturally regulated is
by mountain streams and waterfalls so it is always at optimum water level
T:always at optimum water level