To deal with surface water it is important to consider the need for drainage. Each project will have a gradient, even if the land it is on is flat and level. In fact, it’s likely to have two gradients, one from the beginning to the end, known as the endfall, and one across the drive, known as the crossfall. Even if the top surface is porous, the rain needs to be directed away from the top of the blocks quickly otherwise algae, moss and weeds can develop which, in freezing conditions, can leave land slippery and hazardous.
For some properties, especially those that sit below street level, it’s difficult to solve the drainage problem with correct placement and slope alone. In this situation driveway drains will need to be installed.
A trench drain can be installed where the driveway meets a garage. This type of drain is long and narrow and should run the entire width of the driveway.
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