Derelict mill preventing water flow

Cause or Solution?: 
Causes of flooding
Hello, I am a resident on woodland terrace which was hit very badly by the Boxing Day floods. We on the terrace believe very strongly that the main cause of the flooding was the fact water could not flow from the road down into the river and canal and therefore filled up the road and over burdend the drains which in turn filled up our cellars and homes. The main cause for this, we feel is the derelict mill with the ever stretching wall along it that has been stood empty and unused for more the 15 years now. We can not find the owner of the mill and we do not know how to proceed with this. Can anyone give us advice on it? Can the local authority force him to demolish the mill? Thank you
Question for which agency?: 
I'm not sure
Name of Watercourse Referred To: 
Calis bridge
Location of Cause or Solution: 

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Question Reference: 
Flood barriers/walls
My property
River flows / Water Levels / Weather
Asked By: 
Asker's Location: