I will add to this section as needed, but I will start off with the most common units of measure for lakes and rivers.
CFS refers to flow; AF refers to volume
CFS (Cubic Feet per Second) is a rate of water flow which will supply one cubic foot of water in one second. A cubic foot of water is equal to 7.48 US gallons of water. Thus, water flowing at 1 cubic foot per second is moving 448.8 gallons per minute.
AF (Acre Foot) is a unit of volume equal to one acre of water, one foot deep. An Acre Foot of water is about 326,000 gallons.
According to the Water Education Foundation, an average California household uses between one-half and one acre-foot of water per year.