In Mexico, the Federal Government owns every bit of fresh and salt water in the country. If you drill a well, the Feds own the water and you will be taxed for the luxury of using this resource. If you use deep injection wells to hide your black water (injecting it into a deeper inland salt water intrusion), you are taxed a second time for this luxury. My point being; who owns the water below your feet?
If the DR government owns the water (many countries throughout the world own their water), then you have a problem with private enterprise encouraging federal government corruption. If the DR does not own/maintain/protect their water sources, then this is another (double-edged sword) option to consider.
I would suggest that your first option is to investigate the water laws in DR. Are DR Resorts able to restrict access to DR cave entrances? Restricting access to cave entrances in Mexico is becoming quite popular these days. The "new" resort consortium can build what they want to without an "thorough" Environmental Impact Statement.
I have a copy of a 2006 M.Sc Thesis (Multi-Objective Optimization of Land Use Patterns in the Sian Ka'an Bioshere Reserve Catchment, Quintana Roo Mexico) by Andrea Tampei of the Technological University of Denmark. It is a public document. I can send it to you.
As others have posted, a collection of good cave maps and evidence of DRSS support for local science/hydrology projects is great PR for you. I think you should establish "who" owns and regulates the "subterranean" water first.
Jim

