Why Should I Have A Drainage Plan

Drainage plans show the pollution pathway and will identify your drain and associated infrastructure arrangements. When verified, drainage plans are an essential document when managing your site operations and pollution risk management. This blog will discuss why you should have a clear, comprehensive and verified drainage plan.

  1. Inform your trade effluent operations

If you discharge any water from your trade operations, you will need a permit or licence to do so. If you discharge to surface water, you will require an Environmental Permit from the Environment Agency and if you discharge to foul water, you will need to seek consent from the Local Water Authority. As part of either application, you will have to provide information about your drainage system and at what point you discharge to the drainage network. A clear, comprehensive and accurate drainage plan will make the process of application much more straight forward.

  1. Make sure everything is maintained

To ensure your operations don’t cause pollution and to reduce the chances of flooding, you should be maintaining your drainage networks. An accurate site drainage plan will ensure you maintain all drains, channels and gullies and service, and maintain your interceptors and other infrastructure.  With a clear drainage plan, you will avoid the risk of missing key pollution control features.

  1. Identify the pollution pathway

In order to prevent pollution from leaving your site, you should use your drainage plan to inform your pollution prevention plans. You should locate anything of high-risk, e.g. waste skips and oil and fuel tanks, away from drains and watercourses. In the event of a spill or leak, this will give you more time to intercept the pollution before it can leave your site.

You can use an accurate drainage plan to take swift action if pollution does enter your drainage system as you will know exactly the route it will take. Hopefully, you can do something further along your drainage network to prevent the pollution leaving your site but, if you can’t, you will know exactly who to contact to report the incident. If pollution has entered surface water drains, you must inform the Environment Agency and you must contact the Local Water Authority if you contaminate the foul water system.

  1. Mark your drains

Best practice is to paint your drains red and blue to indicate foul and surface water drains respectfully. You may also use other colours to show interceptors and any drains that lead to any on-site effluent treatment. A precise site drainage plan will make sure your marking is correct and will allow for quick response in the event of an incident.

To effectively manage your site operations and your pollution risk, a drainage plan is an essential document to understand your underground networks and ensure your activities do not pose an avoidable risk. However, merely having a drainage plan isn’t enough. Your plan must be clear and easy to understand and the drains represented on them must be correct and verified. Our next blog will explain the top three things your drainage plan should contain.

To find out how Green Spark can help you with your drainage plan, click here.