My daughter has just bought a terraced house within a row of ten properties. Each "pair" of houses has shared drainage and sewage piping as was common in many terraced houses. I was rather amazed to discover today when I visited her house for the first time, that she has THREE houses connecting onto her own single guttering down pipe in a "waterfall" like series of connections along the roof line. All of the other houses have shared downpipes between two houses. My daughter strongly believes that what she thought was damp walls caused by rising ground water might actually be caused by overloaded guttering. Is it legal to "discharge" rainwater like this.? I am sure that neighbours will not want to know but who should she approach once the neighbours walk away. Is there any point contacting the local authority planning office.? Who else might be able to assist.? Any help or suggestions would be much appreciated.