Before building a berm, a landscape designer or yourself must first plan the berm design. Always consider the berm’s overall purpose beforehand as well as drainage patterns within the landscape. On average, a berm should be about four to five times as long as it is high, gradually trailing out into the remaining landscape. Most berms are no higher than 18-24 inches. The berm design can be created with more than one peak for additional interest as well and shaped to perform its purpose. Many berms are given a crescent-looking or curved shape, which is more natural looking and preferable