Ephemeral Marshes/Cienegas/Springs [EMCS] : Marshes and cienegas are water-saturated poorly drained wetlands periodically inundated up to a depth of 2 m (7 ft). They support an extensive cover of emergent non-woody vegetation without peat-like accumulations (marshes), and are associated with ephemeral spring and seep systems in isolated arid basins of the Southwest (cienegas). Ephemeral springs are areas where groundwater intermittently flows naturally from a rock or soil substrate to the surface to form a stream, pond, marsh, or other body of water.