Soakaway Size Roof

Using this formula we can quickly calculate the size of the soakaway that needs to be installed. The size volume of the soakaway should be based on a drainage calculation this is relatively easy once a drainage percolation test is completed and you know the surface area where the water is coming from. The most common size of soakaway for residential use is 1 cubic metre 1m as this is what most local authorities seem to specify.

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One of the first things to consider when choosing a site for a soakaway is the water table aka saturation line.

Soakaway size roof.

A soakaway is a tank or trench where water is stored and allowed to soak into the ground rather than discharging to an outfall or sewer. Here at drainage superstore we have a number of soakaway crates to choose from. The number of crates you need for a soakaway system doesn t just depend on how big your roof area is. To calculate the size volume of a rubble filled soakaway the same calculation can be used but the result divided by 0 3.

Ah what a relief. Driveway soakaway size without roof drainage only driveway surface water drainage in comparison you may not need to take roof surface water drainage into account at all maybe it drains to the back of your house maybe along guttering to your neighbour. If you have several different surface areas connecting to the same soakaway roof gutter conservatory patio driveway etc then more. Where c is the capacity or volume of the soakaway in m3 a is the area of roof of the building in m2 r is the rainfall expressed in m h metres hour for the rainfall a standard 50mm per hour is usually used which equates to 0 05m h.

All soakaways must be sited at least 5m from any building or road and preferably at least 2 5m from any boundary. Soakaway crates are modular meaning they can be stacked on top of or next to one another. The two determining factors for soakaway success are the size of the area or volume of water to be drained and the percolation rate of the soil sub soil or in some sites the depth to the water table. Each soakaway crate is a different size therefore the brand you choose can determine how many crates your system will need.

As a broad brush a soakaway size of 1m is sufficient to drain a roof area of approximately 50 square metres under normal conditions. For example 50m2 roof area requires a rubble filled soakaway of 50m 2 x 50 3000 0 3 2 8m 3. Soakaway size calculator spreadsheet this spreadsheet makes iterative soakaway design much quicker and easier allowing the designer to complete an optimal design in minutes. You need to calculate the whole impermeable area roof size patio size driveway size etc as well as perform percolation tests to determine the permeability of the ground around the property.