An irrigation district is a special-purpose, quasi-governmental entity designed to provide water and other utilities to rural areas, primarily for agricultural use.
A retaining wall is a structure designed to restrain soil to a slope that it would not naturally keep to (typically a steep, near-vertical, or vertical slope). They are frequently used in landscaping, construction, and flood prevention to prevent the erosion of soil and manage water runoff.
A retention pond is a reservoir designed to hold a specific amount of water indefinitely. Typically, the pond will drain to another location when the water level exceeds the desired level. This term is often used in contrast to a detention pond.
A swale is a shallow, often vegetated, depression on a site used to manage water runoff, filter pollutants, and increase rainwater infiltration. Swales are integral to sustainable urban drainage systems and contrast with berms, which are raised mounds of earth.
