CHAPTER 10 - CURRENT METERS
From the rating curve, a rating table may be prepared for each tenth or hundredth of a foot of gage height from zero to the maximum height of water in the canal or stream. For canals affected by growths or sediment, two or more such rating tables will be necessary, one for early in the season when the canal is clean, and the other for late in the season when growths or other restrictions are present. If the canal is cleaned during the irrigation season, operating personnel should be instructed to switch to the curves and tables for the clean canals.