For lakes entirely different situations/sceneria's and effects could exist.

Think of dirty populated lakes.

Or grounds but under water by rommel, to drown paratroopers.

Soldiers could fall into the water with parachutes and then need to struggle
to get out of it.

The lakes themselfes could have green water or populated water... there
could also be some ducks around which could be killed or fly away to signal
their presense to potential enemies or teammates.

There could be some yellow bamboe/high grass in some sections of the lake.

Trees drowning and growning out of the lake...

Under water tree roots and tree branches.

The soldiers could then ask themselfes:

Do I really wanna go into the dirty ****ty mess ?! The answer might be a
forced: yes ! The enemy is shooting at us with miniguns... we be safer under
water then out here in the open !

So lake could give a somewhat tactical advantage as a natural bullit
stopper.

Lake leaves/plants could be floating on top of the lake.

There could even be frogs, dead frogs or frog foam.

Perhaps dity yellow greenish foam from tiny water rivers/tiny water falls
flowing into the lake.

Perhaps even tree leaves falling and floating down and hitting the lake and
floating on top of the surface.

It's all about details details details details to make it look good,
realistic and interesting ! =D

Bye,
Skybuckd =D