Message-ID: <208426393.20980.1624101934209.JavaMail.confluence@igskahcmvslap20.cr.usgs.gov> Subject: Exported From Confluence MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_Part_20979_825129992.1624101934208" ------=_Part_20979_825129992.1624101934208 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Content-Location: file:///C:/exported.html Field Radar Guidelines Quicksheet (printable)

# Field Radar Guidelines Quicksheet (printable)

## Quick Start Guide

You=E2=80=99ll need to acquire a small amount of velocity and chan= nel data beyond what a normal field trip demands. Data should be collected = at the cross section-of-interest and in the vicinity of the VELOCIT= Y radar footprint. Keep in mind that the radar=E2=80= =99s ability to return a surface-water velocity is influenced by (1) the qu= ality of scatterers or waveforms on the water surface, (2) the air gap or t= he distance between the bridge deck and the water surface, and (3) the pote= ntial noise imposed by wind drift, eddies, secondary flows, and macro turbu= lence.

• Follow the same principles us= ed to site a conventional streamgage (Site Selection, p. 9; Turnipseed and = Sauer, 2010):

• Straight channels with parallel= streamlines

• Streambed free of large rocks, = weeds, obstructions that would create turbulence/slack water

• Sections that are parabolic, tr= apezoidal, or rectangular

• Avoid variable flow conditions = downstream of piers or channel obstructions (please note it is important th= ey we target surface scatterers to achieve sufficient radar returns, but hi= ghly turbulent conditions should be avoided)

• Velocities greater than .5 to 1= feet per second (fps) and depths greater than 0.5 feet (ft)

• Avoid sections influenced by tr= ibutaries or contributing drainage

• Collect the following streamf= low and channel data at the cross section-of-interest:

• Station number and measurement = number

• Date of measurement

• Width

• Area

• Mean-channel velocity

<= /li>
• Gage height

• Discharge

• Lat/long of the starting and en= ding edge of water

• Lat/long of the vertical (terme= d the =E2=80=9Cy-axis=E2=80=9D) where the maximum in-stream or maximum surface-water velocity is measured

• At the y-axis, record the surfa= ce-water velocity and point velocities near the water surface,  close = to the channel bottom, 0.2D, 0.3D, 0.4D, 0.5D, 0.6D, 0.7D, 0.8D, 0.9D using= a current meter, FlowTracker, or Stationary Moving Bed Analysis with an AD= CP

• Confirm the location of the y-a= xis by repeating this procedure to the left and right of the y-axis

• Water depth at the y-axis<= /p>

• Wind speed and direction

• To estimate the stationing of= the y-axis, rely on the location of the maximum-surface water velocity; it= generally coincides at the same vertical as the maximum-instream velocity<= /span>

• Develop a stage-area rating u= sing AreaComp (https://hydroacoustics.= usgs.gov/indexvelocity/AreaComp.shtml)

• Generally, data collection an= d radar deployments point should be upstream of bridges or structures to av= oid eddies, secondary flows, and macro turbulence.

• Velocity radars can be deploy= ed by hand or fixed on bridges, light cableways, or cable stays

<= /li>

## Relate= d articles

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