The volume of water that naturally recharges the groundwater supply minus natural depletions to the groundwater supply.
ADWR Dictionary

ADWR Dictionary
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Net natural recharge
Non-exempt well
Within an AMA, a well having a pump with a maximum pumping capacity of more than 35 gallons per minute and used for non-irrigation purposes or any well used for irrigation purposes. This term is also frequently used to describe any well outside an AMA having a pump with a maximum pumping capacity greater than 35 gallons per minute.
Non-irrigation grandfathered right
Refers to grandfathered rights within active management areas that are associated with irrigated land retired after January 1, 1965 in anticipation of a non-irrigation use, and to grandfathered rights that are not associated with retired irrigated land.
Non-jurisdictional dam
An artificial barrier for impounding water that does not qualify as a jurisdictional dam.
Normal storage capacity
The total volume, in acre-feet, at the normal retention level, including dead and inactive storage and excluding flood control and surcharge storage.