Thank you very much for being patient. Ok, you do have a long hard road ahead of you. What has been done is a Tort. It is a civil wrong compared to a criminal wrong. In short (and it would take me forever to find it again) the laws state that "one that alters or changes the property to adversely effect the others adjoining land is liable for damages" This is a tort. They have committed a Civil Tort. But the issue is going to be that the HOA gave approval. So both parties may be held accountable. The tort would be one of Negligence and/or Nuisance. Your going to most likely need an Environmental Attorney to handle this for you if the below suggestions do not work out.
Tort Law Explanation
Contact the HOA and file an immediate complaint with their approving such and clearly state that you hold both parites liable. Contact your local building inspection and code enforcement to inspect and verify the issues to back up your claims.
Contact the Alabama Department of Enviormental Management to assist you where possible. contact either the land or water divisions.
But most likely your headed to court with this to stop them unless your local county does have specific building codes (and most do) that will not allow for such as this to occur. Contact them to inspect and document.
I have sued an adjoining landowner over the very same situation and from experience I will tell you this is not going to be easy to do without an attorney. A letter addressed to the HOA and the homeowner will most often help. The homeowner is liable and can be made to pay for damages. The more documentation you have to the damage the better your case.
Again, this is a Tort and is civil in nature and they are liable. Both the HOA and the Homeowner.
I suggest that you contact the above people and go from there. Filing suit would be your last course of action due to cost. But legal assistance by way of representation is essential. Please reply with any further concerns or needs. I will be glad to further assist if possible.