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Streamflow Measurement By Area Velocity Method. As the term implies the flow is the product of the average velocity in the cross-section and the cross-sectional area of flow. The total discharge is calculated be the method of mid-sections as follows. The best method for stream flow measurement would therefore be to determine the velocity variation at a channel section and then integrate ie sum the products of velocity in a small individual elemental area with that area for the whole flow cross-section. These methods utilize a velocity-area approach to measuring stream flow or volume of water passing a set point in a given period of time.
Float-Area Method The amount of water passing a point on the stream channel during a given time is a function of velocity and cross-sectional area of the flowing water. Comparison of Velocity Measurements Culvert on Whale Pond Brook October 2006 Floatation measured 20 higher than meters Pygmy meter. Q AV where Q is stream discharge volumetime A is cross-sectional area and V is flow velocity You need. Definition of Streamflow Streamflow or discharge is defined as the volumetric rate of flow of water volume per unit time in an open channel Streamflow in the USGS is usually expressed in English dimensions of cubic feet per second ft3s or CFS. 083 ftsec 17 verticals Floatation. A Area-velocity methods b dilution techniques c electromagnetic method and d ultrasonic method.
Discharge area x velocity.
INTRODUCTION As we know that the Precipitation Evaporation and Evapotranspiration are all difficult to measure exactly but the Stream flow is the only part of the hydrologic cycle that can be measured accurately. 087 ftsec 17 verticals Flow tracker. The velocity averaged over the vertical at each section is known. In general river discharge is computed by multiplying the area of water in a channel cross section by the average velocity of the water in that cross section. This is achieved by attaching the current meter to a height-calibrated rod. A stream is defined as.