Examples from the Web for spillway
Behind was the bubbling, leaping flow of the spillway itself, and Gatun Dam.
When the saw was still the water overflowed the "stop-logs" by the "spillway" into the pond below.To Him That Hath|Ralph Connor
The spillway is a concrete-lined opening cut through a hill of rock near the center of the dam.Boy Scouts in the Canal Zone|G. Harvey Ralphson
Preparations for taking several views of the big Gatun Dam from the lower, or spillway side, were made.The Moving Picture Boys at Panama|Victor Appleton
You run up the hill the spillway channel is cut through; it iss high ground, and the golf course iss on high ground.