![]() In order to make sure you don’t order too much or too little gravel, measure the width and depth at regular intervals. It’s important to note that your trench will not have uniform dimensions throughout its span, and it may vary due to small anomalies made during the digging. You want to note and write down the length, width and depth of your trench. Measuring the dimensions of the french drain trench The number we end up with is the amount of gravel you’ll need. Once we have these two numbers, we’ll deduct the volume of the pipe from the volume of the trench. The length, width and depth of the trench.In order to accurately calculate the amount of gravel you’ll need to fill up your french drain trench, you’ll need to calculate two things: Generally, river gravel or granite works well, as it lets water through and does not deteriorate over time. Keep in mind that you don’t have to stack the gravel tightly, or else water will not flow through the rocks. Our french drain gravel calculator above does the entire calculation for you. ![]() We now get the volume of the remaining space, which you want to fill up with gravel. To calculate the amount of gravel needed to fill the space between the pipe and the walls of your french drain, we simply subtract the volume of the pipe from the volume of the trench. Where h represents the height (or, since it’s vertical, the length) of the pipe, and r represents the radius, which is half the diameter (the width) of the pipe. To calculate the volume of a cylinder, we use the following formula: How to calculate the Volume of a Cylinder Where l represents the length, w the width and h the height of the cuboid. To calculate the volume of a cuboid, we use the following formula: ![]() The pipe in your french drain can be represented mathematically by a cylinder. The trench for your french drain can be represented mathematically by a cuboid. The Formula for calculating the gravel needed for your french drain
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