Like permeable paving, infiltration trenches are designed to create space for capturing rainwater that runs off impervious surfaces. They can make open spaces in impermeable paving and tight areas to help sink water into the ground.
Trenches are created by shoveling out the earth and installing structures which will allow water to enter the trench and slowly soak down into the ground. Simple trenches can be dug and filled with permeable material such as gravel, or with prefab crates that create extra detention space. They can even be covered with decorative grates (as seen above).