How Do I Know What Size My Soakaway Should Be?

A soakaway system allows you to gather water and gradually release it into the surrounding soil without causing excessive runoff or overwhelming the underground drainage systems. This is especially important in regions with higher-than-average rainfall, hard ground, or steep slopes. Installing a soakaway is relatively straightforward and requires minimal upkeep – essentially, you just need to dig a hole of the appropriate size, wrap the soakaway crates in a suitable geotextile membrane, place them in the ground, and connect them to your drainage system, typically using 110mm drainage pipes. However, because of this, it's crucial to choose enough crates of the correct size to handle the amount of water you need to manage. If you don't, the system might become overloaded and fail to handle the volume of water, leaving standing water issues unresolved. In this guide, we'll walk you through how to calculate the right size for your soakaway and discuss additional considerations you should keep in mind before starting your project. Key Takeaways: - To figure out the size of a soakaway, you'll need to conduct several tests and calculations, including a percolation test, annual rainfall assessment, and roof area measurement. - As a rough estimate, many people opt for 1 cubic meter of water storage capacity for every 50 square meters of roof area. However, this is just a rough guess and won't work well if the ground conditions aren't ideal. When it comes to residential applications, the most commonly used soakaway size is 1 cubic meter. Some local authorities even specify this size in their sustainable drainage standards. While this size may suffice for roofs up to 50 square meters under average UK conditions, it's highly recommended that you calculate the exact size you need before purchasing. Always consult with your local authority to ensure you're following any specific regulations or requirements they might have. To determine the correct size of soakaway needed, you should perform a soil percolation test first. The results will help identify soil conditions, such as clay content, which will influence your soakaway design. For instance, if the soil drains slower than anticipated, you might need a larger soakaway. Conversely, if the ground doesn't drain at all, a soakaway wouldn't be appropriate. The percolation test should be your initial step, but other calculations are essential too, like measuring the roof area and assessing annual rainfall. Unfortunately, there's no automatic soakaway size calculator available yet, but we're working on one, and we hope to offer it soon! If you have a gable roof, calculating its surface area involves measuring its length from end to end and its slope height from the eaves to the ridge. You can sometimes find these measurements on your building plans. Multiply the length by the slope height and double the result to get the total area. In short, the formula is Roof Length x Roof Slope Height x 2 = Roof Area. For more complex roof shapes, break the roof into sections, calculate each section's size, and sum them up for the total area. For a more detailed guide on roof area calculations, check out our blog post on installing a soakaway drain. When it comes to crate capacity, use the general guideline below to determine how many crates you'll need based on the combined capacity of the brand and type of soakaways you're considering. Keep in mind that this is just a rough estimate, and it's best to consult a drainage engineer for precise calculations and tests: - 50m² requires crates with a water storage volume of 1.0m³ (1000 liters) - 60m² requires crates with a water storage volume of 1.2m³ (1200 liters) - 80m² requires crates with a water storage volume of 1.6m³ (1600 liters) - 100m² requires crates with a water storage volume of 2.0m³ (2000 liters) As a basic rule of thumb, for 50m² of roof area, you might be able to get away with 1m³ of water storage space. Next, decide on the type of soakaway crate you want, and divide 1m³ by the volume of each individual crate. For example, using Brett Martin Stormcrate crates, each crate holds 0.25m³ of water, so 1m³ divided by 0.25 equals 4 crates needed. Each Brett Martin crate measures 1200mm long, 600mm wide, and 347mm high, so keep these dimensions in mind when planning your hole size. Beyond selecting the right size, ensure the soakaway is installed at least 5 meters away from any house, building, or retaining wall. Check that you have enough space before beginning. Also, avoid placing a soakaway in areas where water could become contaminated, and never position one near another rainwater soakaway. If neither option is feasible, consider an alternative solution like an attenuation tank. At EasyMerchant, we offer durable soakaway crates, attenuation tanks, and drainage crates, including complete soakaway crate kits that come with crates, non-woven geotextile membrane, waterproof tape, and cable ties for a full installation. Our experts can guide you in ordering items with the right dimensions and volume. In summary, calculating the correct size for a soakaway involves multiple steps and considerations. By following the guidelines above and consulting professionals when needed, you can ensure your soakaway system functions effectively and efficiently.

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