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Top 3 Things Your Drainage Plan Should Contain

An accurate and verified drainage plan will identify your site drains and associated infrastructure, giving you a clear understanding of your pollution pathway. Our previous blog, which you can read here, discusses the reasons why you should have a site drainage plan. This blog looks at the top three things that should be included on your drainage plan.

  1. Surface and foul drainage

Your drainage plan should identify all the underground drainage networks, clearly showing foul and surface systems. Foul drains (usually identified in red) lead to sewage treatment works, whereas surface water drains (usually identified in blue) lead directly into the environment. Your site drainage plan should show all manholes, rainwater pipes, gullies and drainage channels. In addition, the plan should show the drain flow; as in what direction the water flows underground and clearly showing the point at which any water leaves your site.

  1. Interceptors and infrastructure

Any key features on your site should clearly be shown on your drainage plan. This may include oil interceptors, soakaways, storm water attenuation systems and water recycling equipment. All areas creating effluent, such as on-site vehicle washes, tray washes and your toilet facilities should also be shown on your plan. How effluent enters the drainage system and whether interceptors are on the foul or surface drainage network should be very clear.

  1. Above ground gradients

Above ground gradients will show you at a glance how surface water will flow over your site and enter the underground drainage system. These should be shown clearly on your drainage plan and be used to respond quickly in the event of an incident or spillage. You can place spill and absorbent material in strategic locations to intercept pollution before it enters the drainage system.

Having a site drainage plan is very important when considering how to prevent pollution. However, your drainage plan must be comprehensive and show all relevant details so you can use it to its full potential. As a minimum, it should show you your foul and surface water drainage, interceptors and site infrastructure and above ground gradients. As long as this information is verified and accurate, your drainage plan will be an essential part of your site environmental management and pollution prevention plan.

Green Spark can carry out on site surveys to create an accurate, straightforward drainage plan. To find out more, click here.

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