What type of attorney?

[nonsenseabound]

you probably want someone that specializes in real estate/property/land use.

[thedash]

Land use, I think. Usually attorneys who do that also specialize in zoning and planning, which may help you search online.

[pandagirl]

Agree with patrish1980 - a good property/land use attorney, specifically one that has experience with water diversions and adverse impact. One place I sometimes start is the bar association for your state - then search the specific issues (property/etc) to see what attorneys have given CLE presentations on the type of issues you are dealing with. Good luck.