ABSTRACT
L L (or ell) A fitting used to connect two pipes at an angle, usually 90°. Also called
an elbow. L (or l) Abbreviation for liter(s). Labyrinth spillway An overflow spillway with a sawtooth crest to increase its
length and capacity. Lacey’s formulas A set of equations proposed for the design of stable channels
in erodible or alluvial materials. See also Equations R-12 through R-14; regime theory.
