Rangersedge
Good work--There is no such thing as over kill when it comes to, getting rid of the water.
You will be glad you put a pipe in that will let you drain the lake if you want to. You may never use it- but when you want it you will be glad you did.

Do not be affraid to buy some material to pack around the pipe if you need it. It will make the job easier and let you sleep better at night.