Because of the extreme amout of snow and rain we had this year, the bottem of our pool is wrinkled in many area's and if you look under the deck you can see that the force of the water has washed the ground away (in places) from the bottem of the pool. Can anything be done to correct this problem?

No amount of snow or rain should errode under your pool if you had water in it, did you? Once the pool base is no longer level or flat you must empty the pool, pull the liner and relay the base. Liners get brittle after 3-4 years so it may need replacing.