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Drainage glossary · Blockages and their causes

Cross connection

A pipe connected to the wrong system, most often a rainwater downpipe joined into a foul drain or a washing machine discharging into a surface water gully. It overloads one system and pollutes the other.

What it means for you

Cross connections are a common cause of drains that only misbehave when it rains, and they are illegal to leave in place.

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