Are you planning to install a soakaway system? Proper sizing is crucial to ensure its effectiveness. In this guide, we will take you through the process of dimensioning a leaching pit, commonly known as a soakaway. Let’s dive in!

What is a Soakaway?

A soakaway is an underground structure designed to manage and disperse excess water from areas such as roofs, driveways, or garden surfaces. It is an eco-friendly solution that helps prevent flooding and waterlogging by facilitating the natural absorption and infiltration of water into the surrounding soil.

Why Is Correct Sizing Important?

Sizing your soakaway correctly is vital to ensure its efficiency and longevity. An undersized soakaway may not handle the volume of water, leading to overflow and potential flooding. Conversely, an oversized soakaway can be wasteful and unnecessary. By sizing it correctly, you ensure proper water disposal and prevent potential issues.

Factors to Consider

Several factors should be taken into account when sizing a soakaway:

  • Surface Area: Calculate the total surface area that will drain into the soakaway. This includes the area of roofs, driveways, and any other contributing surfaces.
  • Rainfall Intensity: Consider the average annual rainfall intensity in your region. This information can be obtained from local weather resources or authorities.
  • Soil Permeability: Assess the permeability of the soil in your area. Different soil types have varying infiltration rates, affecting the effectiveness of your soakaway.

The Calculation Process

Now, let’s look at the step-by-step calculation process for sizing your soakaway:

  1. Determine Surface Area: Measure the total surface area that will drain into the soakaway. Add up the areas of all contributing surfaces.
  2. Calculate Drainage Volume: Multiply the surface area by the average rainfall intensity to determine the drainage volume.
  3. Assess Soil Permeability: Identify the permeability rate of the soil in your area. You can consult a soil engineer or refer to geological surveys.
  4. Apply Infiltration Rate Multiplier: Multiply the drainage volume by the appropriate infiltration rate multiplier based on your soil type. This will account for the soil’s inherent ability to absorb water.
  5. Determine Soakaway Size: Divide the adjusted drainage volume by the desired fill factor. This will provide the required soakaway volume or pit size.

Seeking Professional Assistance

If you are unsure about performing the calculations yourself or if your project requires advanced sizing, it is advisable to seek professional assistance. Consulting a civil engineer or a specialized soakaway designer will guarantee accurate sizing tailored to your specific needs.

Remember, the correct sizing of a soakaway ensures optimal functionality and protects against potential drainage issues. By investing time in proper dimensioning, you can effectively manage excess water and contribute to a more sustainable environment.

Now that you understand the process of sizing a soakaway, you can confidently plan and install your own system. Happy dimensioning!

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