Pediments and Alluvial Fans The term, mountain front, is an imaginary borderline between a mountainous area and a low, gently dipping plain (either a pediment or alluvial fan). A pediment is a gently sloping erosion surface or plain of low relief formed by running water in arid or semiarid region at the base of a receding mountain front.
Evaporation in arid lands enriches mineral accumulation in their lakes. Playas may be sources of mineral deposits formed by evaporation. Water evaporating in closed basins precipitates minerals such as gypsum, salts (including sodium nitrate and sodium chloride), and borates.
Green infrastructure in the semiarid West can be specifically designed to address rapid freeze/thaw cycles, semiarid conditions, and intermittent and unpredictable rainfall patterns. Green Roofs In Region 8 most "Green Roofs" are not actually the color green.