I gather you are talking (covered an boxed in)open hole/pit driven well and sand point? if this is it I had the same problem with minor flooding one wet/melt spring! what I did was to incase the 1.5" pipe with 4" pvc pipe down to 16'(42 foot to the tip of the sand point at ground level)0f which is the 1st hard pan...I am in sandy soil anyways, but used fresh water down the 4" pipe and screwing it down to that depth tapping the pipe as turning it also.... it is now 1' above ground at the brass anti siphon check valve....