Price current-meter standard rating development by the US Geological Survey

Citation
Ef. Hubbard et al., Price current-meter standard rating development by the US Geological Survey, J HYDR ENG, 127(4), 2001, pp. 250-257
Citations number
6
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF HYDRAULIC ENGINEERING-ASCE
ISSN journal
07339429 → ACNP
Volume
127
Issue
4
Year of publication
2001
Pages
250 - 257
Database
ISI
SICI code
0733-9429(200104)127:4<250:PCSRDB>2.0.ZU;2-W
Abstract
The U.S. Geological Survey has developed new standard rating tables for use with Price type AA and pygmy current meters, which are employed to measure streamflow velocity. Current-meter calibration data, consisting of the rat es of rotation of meters at several different constant water velocities, ha ve shown that the original rating tables are no longer representative of th e average responsiveness of newly purchased meters or meters in the field. The new rating tables are based on linear regression equations that are wei ghted to reflect the population mix of current meters in the field and weig hted inversely to the variability of the data at each calibration velocity. For calibration velocities of 0.3 m/s and faster, at which most streamflow measurements are made, the new AA-rating predicts the true velocities with in 1.5% and the new pygmy-meter rating within 2.0% For more than 95% of the meters. At calibration velocities, the new AA-meter rating is up to 1.4% d ifferent from the original rating, and the new pygmy-meter rating is up to 1.6% different.