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This is dealt with under "trespass" law - you can file a civil claim against them and ask for "injunctive relief" and "declaratory relief" (a court order requiring them to make changes to prevent the change of water flow onto your property).
Unfortunately, this is not a simple type of case, and I would highly recommend retaining a local real estate
attorney (with experience in civil litigation) to represent you in this matter.
Short of filing a lawsuit, you can try to mediate the dispute with them - contact your local bar association
and request referrals to mediators, a third party neutral can often help you reach a mutually agreeable resolution. Use the bar association's referrals to contact a mediator or two, the mediator will then contact the other party to set up a mediation session, and you can go from there - hopefully resulting in a formal or written settlement agreement, and save yourself the time and expense of litigation.
You can find local attorneys using the State Bar Association directory:
, or private directories such as www.AVVO.com
; or www.Martindale.com
(I personally find www.AVVO.com to be the most user friendly).