EQUIPMENT AND SUPPLIES--Current Meters In Reply Refer To: September 10, 1985 WGS-Mail Stop 415 SURFACE WATER BRANCH TECHNICAL MEMORANDUM NO. 85.14 Subject: EQUIPMENT AND SUPPLIES--Current Meters Please replace the original table 1 provided with Surface Water Branch Technical Memorandum 85.07 dated May 13, 1985, with the attached table. This will correct an erroneous value of minimum velocity given for the Price- Pygmy meter in the original table. Verne R. Schneider Acting Chief, Surface Water Branch Attachment WRD Distribution: A, B, S, FO, PO This memorandum corrects Surface Water Branch Memorandum 85.07. Table 1.--Configuration, availability, recommended velocity, and depth ranges for U.S. Geological Survey Current meters ____________________________________________________________________________________________________________________________ |_____Bucket______|_________Contact___| | Velocity | Depth | Meter | | | | | | range in | range | type__________|Metal__|Polymer|Catwhisker_|Optic|Availability|___ft/s___|_inft____|Remarks____________________ | | | | | | | | Price AA | x | | x | | Available | 0.10-12 | 1.5 and | | | | | | | | greater | | | | | | | | | Price AA | x | | | x | Not planned | | do. | | | | | | | | | P-AA | | x | x | | Available | 0.15-12 | do. | | | | | | | | | F-AA | | x | | x | Available | 0.15-12 | do. | | | | | | | | | Price-Pygmy | x | | x | | Available | 0.25 | 0.3-1.5***| Low velocities shown on | | | | | | | | standard rating table are a | | | | | | | | questionable extrapolation | | | | | | | | Price-Pygmy | x | | | x | Not planned | | do. | | | | | | | | | P-Pygmy | | x | x | | FY 1987 | | do. | | | | | | | | | F-Pygmy | | x | | x | FY 1987** | | do. | | | | | | | | | Low velocity | x | | | | Available | | --- | No difference in rating | | | | | | | | from Price AA meter | | | | | | | | Ice |Vertical-| | | | Available | 0.5-8* | 1.5 and | Rod use - not to be used | vane | | | | | | greater | closer than 0.5 foot to | | | | | | | | surface or bed | | | | | | | | F-Combination | | | | | FY 1987 | | --- | This meter will be usable | | | | | | | | with rod, cable, or ice ______________|_________|_________|_____________|_______|______________|__________|___________|suspension________________ *Meters are individually rod rated. Those rated prior to December 1, 1981, should only be used within this range. **Specially rated versions of this meter can be requested from the Hydrologic Instrumentation Facility. Meter is recommended for high velocities and shallow depths. ***Meter may be used in depths as low as 0.3 foot by using the 0.6-depth method. It should be recognized, however, that there is an unknown underregistration error when the meter is used in depths less than 0.75 foot.