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  1. The typical dimensions for a French drain system are12345:
    • Width: 6 to 12 inches
    • Depth: 12 to 24 inches
    • Slope: At least 1% (one inch of slope for every 10 feet of pipe)
    • Trench width: 9 to 12 inches
    • Trench depth: 18 inches
    Learn more:
    The typical size of a French drain system is 6 inches wide and 12 inches deep. This drain system will have to be replicated if the area is large.
    www.doityourself.com/stry/how-to-properly-size-a-f…
    To calculate a French drain, determine the length, width, and depth of the drain. Multiply these dimensions to find the volume, and then calculate the amount of gravel needed based on the volume. How deep and wide should a French drain be? A typical depth for a French drain is around 12 inches, and the width can vary from 6 to 12 inches.
    gegcalculators.com/french-drain-size-calculator/

    Highlights

    • A four-inch diameter perforated French drain pipe running five to ten feet is the standard size.
    • A large French drain is necessary for areas that experience heavy rainfall and extreme storms.
    www.angi.com/articles/french-drain-dimensions.htm
    All things being average, meaning a rainfall of 32.2 inches, 8500 square feet of acreage, and typical seasonal weather, a French drain system with a single drain pipe built on a trench six to eight inches wide and 18 to 24 inches deep should be sufficient.
    frenchdrainsystem.com/sizing-considerations/
    • Check for underground utility lines and pipes before digging.
    • The trench should be about 18 inches deep and 9 to 12 inches wide.
    www.homedepot.com/c/ah/how-to-install-a-french-…
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    4 days ago · The type of gravel you should use for a French drain depends on the size and purpose of the drain. I recommend medium-sized gravel with a diameter of about ¾ inch to 1 inch. This size allows for good drainage and prevents …

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  8. French Drains: A Homeowner's Guide - Bob Vila

    Aug 27, 2024 · The elements of a French drain are all designed to allow water to pass through easily, preventing it from pooling; the drain is angled in such a way as to draw water away from the trouble...

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    French drain depth: About 8 inches to 2 feet deep should be sufficient for many water-diverting projects, though related systems, such as those built around foundations and sub-ground living spaces, as well as the bases of retaining …

  10. French Drain Dimensions - Angi

    Jun 5, 2024 · French drains come in many shapes and sizes, but each has the same job—to divert water away from your basement and foundation. Here are the different types of French drains and their common dimensions.

  11. French Drains 101: How to Determine the Right Size

    Jul 1, 2020 · According to foundation repair experts, a typical French drain system in a residential home has a four-inch diameter. But if the area experiences a high volume of water, it might be suitable to install six or eight-inch pipes.

  12. How to Calculate the Size of a French Drain