Pot hole
deep pot holes
Re-phrase the question - it is not clear.
Many hazards can be hiding in standing water. One of the most treacherous is sinkholes. Another danger in many states is flash floods. Even six inches of water can be hiding a current that will sweep your car away. (If your doing your your driving permit your answer should be "All of the above".)
A pool of standing water can be hidinga great many different kinds of bacteria. These bacteria are invisible to the human eye.
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Some time ago a child went missing not far from where I live . She was finaly found in a swimming pool full of stagnant water after nearl 2 days.
Though the surface water is stagnant in a standing pool life may still thrive there. The beautiful Lotus flower loves stagnant water. The anaerobic bacteria is also found in stagnant water.
Put a tarp roughly as big as your pool on it overnight if it is near a garden with good hiding places for small things.
You could draw a picture of someone standing in a swimming pool, with the water level being above their head.
Yes. The female lays her eggs in standing water. You can sometimes see the larvae swimming in a pool of water that has been standing for a few days.
Is the fountain Solid Brass or Chrome-Plated Brass?