Vocabulary to know before you start
Impervious surfaces: Hard surfaces that do not allow water or other liquids to soak in or pass through. Impervious surfaces are sealed off and impenetrable. Examples include roofs, roads, parking lots, and sidewalks.
Permeable surfaces: Surfaces that allow water and other liquids to soak in or pass through, like water trickling through a sponge or sieve. Examples include fields, gardens, and forest floors. Some human-made surfaces can be permeable, too.