1) Your main electrical panel should have a directory, listing the branch circuits for the various areas of the house. For those areas where you lost power, I would recommend to leave those circuit breakers in the OFF position until an electrician can check everything.
2) It is possible that the cover came in contact with a branch circuit wire and may have shorted the circuit due to frayed insulation or direct contact with the copper wire. If so, the circuit breaker should have tripped. If you do not feel comfortable in checking the panel, I would recommend to have an electrician perform a visual inspection for any frayed wires, arc marks, burning of insulation, etc. The hot bus bar for a branch circuit breaker or breakers may have had an arcing effect. The breakers for those areas of the house should be temporarily removed and visually inspected for any arcing on the stabs of the breakers. If arcing appears on the breaker stabs, the breaker or breakers should be replaced.
3) If the water came in contact with any receptacles, wall switches or Romex cables, these will need to be de-installed and replaced. If the water came in contact with Romex cables, the Romex will also need to be de-installed as Romex is not rated for wet conditions. Romex cables also have a paper inside the white or yellow Romex. If water reached inside any Romex cables, this creates a "wicking" effect where the paper will absorb moisture or water.
Hope this helps………If you have any additional questions, let me know and I’ll be glad to answer them for you.
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The next time you have an electrical question, you can also request for me at:http://www.justanswer.com/home-improvement/expert-your-electrician……….Thanks…………..Kevin!