AZS

Hi - I am hoping someone can offer some advice. We have replaced a septic tank with a water treatment plant and discovered with all the rain that our drainage field gets overwhelmed in winter as we have a high water table. The clean water needs to go somewhere and there is a ditch on the other side of the lane that we maintain that we would like to output to during winter when the ditch is flowing (I understand you can install an automatic switch to do this). I also understand I would need the landowners permission, but do they have the right to say no and leave us with a non-functioning system (and therefore a house we can’t live in)? How do riparian rights work? Thanks for any advice.