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Management of Surface Water Generated from New Development

This is one of a series of guidance notes providing information to help you understand our procedures and improve design standards.

Welsh Government Planning Policy Wales states that flood risk is a material planning consideration. Technical Advice Note 15: Development and Flood Risk (TAN 15, 2004), also states that surface water is a material consideration and explains that development should not create additional run-off compared with the undeveloped situation and re-development schemes should aim to reduce run-off where possible.