How do I determine the contents of my infiltration crate?
When installing infiltration crates, it is important to know what the content of the crates should be. This depends on various factors, such as the size of the roof or the surface you want to disconnect. With this guide we help you step by step when calculating the correct number of infiltration crates for your situation.
1. Why is it important to calculate the correct number?
A well-designed infiltration system prevents flooding and ensures that rainwater is drained efficiently. If you use too few crates, the system can become overloaded. Placing too many crates can cause unnecessary costs. That is why it is crucial to calculate the right number.
2. Factors determining the amount of infiltration crates
When calculating the required infiltration crates, you must take the following factors into account:
- Size of the roof/paving surface: The larger the roof/paving surface, the more rainwater is collected and the more infiltration capacity is required.
- Precipitation intensity: In the Netherlands, an average precipitation intensity of 60 mm per hour is often calculated, depending on the region.
- Soil type: The permeability of the soil (e.g. sand, clay or loam) determines how quickly water infiltrates into the soil.
3. The calculation: how much water do you need to collect?
To determine how much water your infiltration system should be able to handle, use the following formula:
V = A x P x C
Whereby:
- Q: The volume of rainwater in liters.
- A: The surface area of the roof (in m²).
- P: The precipitation intensity (in mm, for example 60 mm = 0.06 m).
- C: The drainage coefficient (depending on the roof material, usually 0.8 - 0.9 for hard surfaces).
Example: If you have a roof surface of 50 m² and you calculate with 60 mm of precipitation and a discharge coefficient of 0.9, the calculation becomes:
V = 50 x 0.06 x 0.9 = 2.7 m³ (2700 liters)
4. How many infiltration crates do you need?
Each infiltration crate has a certain storage volume, for example 200 liters. To calculate the number of crates required, divide the total water volume (V) by the storage volume of a crate. In this example:
Number of crates = 2700 / 200 = 13.5 (round up = 14 crates)
5. Use our online calculator
Do you want to calculate quickly and easily how many infiltration crates you need? Use our online calculator . Enter the dimensions of your roof and other data, and you will immediately see the correct number of crates.
With the right calculation you ensure that your infiltration system works optimally. Start your project today and discover our range of infiltration crates and accessories!
