California Code
ARTICLE 4 - Conduits and Screens: Diversions Less Than 250 Cubic Feet per Second
Section 6026.

6026. Any screen installed under this article shall be such as will be reasonably adequate to prevent fish from passing into the conduit and will not unnecessarily impede the flow of water or prevent the owner from diverting the amount of water he is legally entitled to divert.

(Enacted by Stats. 1957, Ch. 456.)