An attenuation tank is essentially a large container that acts as a buffer to store excess rainwater in the event of a storm and remove the risk of flooding of a residential area. There’s lots to consider when sizing a tank so we’ve put together this guide to help you choose one that suits your requirements.
The main factors to determine the size of an attenuation tank include location, depth of drainage system, storm return period, soil type and infiltration rate.
Geographical location
Where you’re located will determine the average amount of rainfall you can expect to get each year. Therefore, the higher the rainfall and likelihood of storms developing means the bigger the size of tank needed.
Catchment area
The catchment area of rainfall will be another key factor in determining the size of the attenuation tank required. This is calculated by working out the surrounding area and the amount of rain that will run-off the catchment area so it can be processed by the tank.
The storm return period
This refers to the average times between storms. This is calculated using historical information, for example a storm return period 1 in 30 years means it has only happened once in the last 30 years.
Soil infiltration rate
]Infiltration rate is measured through metres per second - this calculates how many metres of water saturate the soil during that time.
How can we help?
Here at Cotterill Civils, we don’t just supply a range of stormwater attenuation solutions, including soakaway crates and stormwater attenuation tanks, we design and install them too. If required, we can also install your system for you – providing you with the peace of mind that it’s installed correctly – and will be more than happy to offer a bespoke solution to suit your requirements.
If you would like to know more about our stormwater attenuation tanks and how they work, please feel free to call us for expert advice on 0121 351 3230.
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