Discharge Measurements in Shallow Urban Streams Using a Hydroacoustic Current Meter
By: G. T. Fisher and S. E. Morlock
Edited by: Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B.Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B.
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Abstract
Hydroacoustic current-meter measurements were evaluated in small urban streams under a range of stages, velocities, and channel-bottom materials. Because flow in urban streams is often shallow, conventional mechanical current-meter measurements are difficult or impossible to make. The rotating-cup Price pygmy meter that is widely used by the U.S. Geological Survey and other agencies should not be used in depths below 0.20 ft and velocities less than 0.30 ft/s. The hydroacoustic device provides measurements at depths as shallow as 0.10 ft and velocities as low as 0.10 ft/s or less. Measurements using the hydroacoustic current meter were compared to conventional discharge measurements. Comparisons with Price-meter measurements were favorable within the range of flows for which the meters are rated. Based on laboratory and field tests, velocity measurements with the hydroacoustic cannot be validated below about 0.07 ft/s. However, the hydroacoustic meter provides valuable information on direction and magnitude of flow even at lower velocities, which otherwise could not be measured with conventional measurements.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Discharge Measurements in Shallow Urban Streams Using a Hydroacoustic Current Meter |
| ISBN | 0784406553 |
| Year Published | 2002 |
| Language | English |
| Larger Work Title | Hydraulic Measurements and Experimental Methods |
| First page | 888 |
| Last page | 894 |
| Conference Title | Hydraulic Measurements and Experimental Methods 2002 |
| Conference Location | Estes Park, CO |
| Conference Date | 28 July 2002 through 1 August 2002 |
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