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Catchment Management

Ground level rain gardens are planting areas that are deliberately located where they collect rainwater run-off and store it temporarily – they become boggy in downpours. As they are dry most of the time, many everyday plants can cope with the conditions. A layer of gravel below the topsoil helps increase storage capacity.

Rain garden planters divert water from drainpipes, to slow / reduce the flow into sewers. So long as there is a plan for any overflow, they can be built over existing surfaces. Excess water can continue into the existing system, as before.

Green roofs can be created on sheds, garages, log stores, bin stores - you name it! They are heavier than normal roof construction, so consult an engineer to check your structure is able to stand the weight. Sedum roofs can be lighter than more biodiverse and interesting planting schemes, which need deeper soil. Both can be designed to need very little maintenance.

Trees have many benefits, including stopping up to 12% of rainfall hitting the ground, even in winter.

Water butts are useful, easy to fit, available at discount from Yorkshire Water, and help to slow the flow. Taps can be left open ahead of heavy rain, to act as a ‘mini leaky dam’.

Detention Basins are shallow, planted areas, that are usually dry, but collect heavy rain. They can be any scale, and can either allow the filtered water to infiltrate the ground, or send water slowly to the traditional drainage system via an outfall.

Swales are shallow, broad, vegetated channels designed to store and/or convey runoff and remove pollutants in water. They may be used as conveyance structures to pass the runoff to the next stage of the treatment train and can be designed to promote infiltration where soil and groundwater conditions allow.

Sunken rain gardens can be incorporated into an urban space and there are always ways of getting creative with retrofit designs! All rain gardens will do the similar job of holding water, slowing/redirecting flow or encouraging infiltration.

Permeable Surfaces can replace car parks and paths with materials that don’t shed water, such as:

• Gravel
• Reinforced grass
• Porous surfaces
• Permeable paving
• Slabs/setts on gravel and without mortar

Extra water can sometimes be stocked underneath, using a layer of stone, or in special crates.

• Reduced flood risk
• Improved water quality
• Increased biodiversity
• Helping your personal impact on the environment
• Some lovely garden features for you to enjoy

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