Count your blessings, free water. If you have a salt water pool you are better of hanging on to it because if you dump you weaken the salt in the pool. If you feel that you need to have the skimmer working properly which is important in keeping pools clean you could get a floating pool skimmer which will work whether the water is high or low. Regardless of what you do evaporation will soon bring the water level down again.
W(15) is the number of gallons of water in the pool after 15 minutes.
Filter the water before filling the pool. Filter the water after filling the pool. Add chlorine only after you have filtered the water for 24 hrs or more.
The correct answer is: W(43) is the number of gallons of water in the pool after 34 minutes.
Rain, pool, beach
Try water. I could be wrong, but try water.
because the rain water mixes with the chemicals in the pool
To remove excess rain water in an inground pool, you likely want to get a filter. You can also install a drain at the very bottom of the pool, but this will need to be closed if there were water in the pool for swimming.
too much iron in water when filling up small pool
That depends on the size of the pool and how fast the water is running that is filling it.
Nothing in particular. The chlorine in the pool should take care of the rainwater in the pool. But, rain or no rain, be sure to keep checking your pool water for chlorine, acidity, alkalinity, etc.... in order to maintain safe and clean water. The sun does as much damage to pool water as rain. You MUST be didligent in checking the chemistry of your pool. Good luck!