Create the rain garden by building a berm in a low spot in the yard, then build swales to channel runoff from the gutters and higher parts of the yard. The water is then absorbed into the soil ...

In order to provide a sufficient surface area to meet the required storage volume, a slope with the ratio of 1:5 was created as side slopes and a 10-inch high berm with a width of 19 (?) inches was ...

He adds that “you want to design [the rain garden] so the area in which the water is going into will be similar to a berm ...