WAC 173-173-150   What are the operation and maintenance requirements for open channel measuring facilities?  (1) Rating curves shall be recalculated when there is a change in channel conditions that significantly alters flow across the control or once a year, whichever is more frequent.

     (2) If the measuring system has no continuous stage recorder, an observer shall read the staff gage and record the reading as close in time as is practical before and after changes in regulation of flow occur.

     (3) Measuring facilities shall be operated and maintained to ensure that discharge can be measured accurately.



[Statutory Authority: RCW 90.03.360, 90.44.050, [90.44.]250,[90.44.]450 and chapter 43.21A RCW. 02-02-017 (Order 00-01), § 173-173-150, filed 12/21/01, effective 1/21/02.]