Hi.
If you go onto El Blog De Maria Legal Tip 346 on this forum you will find some of what you ask.
Hope it helps you, but in the short it's the giving of a legal permission from a landowner to a water company to have access to install / maintain related facilities....Water.
You should get this throughly checked out by a solicitor just in case any "Improvements" to the water means something like a massive water pump or pumping station, as opposed to just a couple of plastic water pipes crossing over your land...If you have land.
It's also to do with drainage from your house onto other peoples pathways / courtyards ect, but it could be a little bit more then just something as simple as a flow of water.
PS...Forgot to add, as many have said on here...This is Spain after all....Suppose that means....Whats spoken, and being legal today...Might not be tomorrow......Wisest words ever spoken.
This message was last edited by baz1946 on 13/05/2014.