SonTek, a Xylem brand
RiverSurveyor S5/M9 System Manual (February 2013)
83
Profile Extrapolation (Figure 104) – Allows you to change the way the top/bottom estimates
are calculated. In general, the default settings are adequate for most applications. The Method,
Cells to Use, and % of Profile fields have dropdown menus. The Coefficient, Discard Last, and
Cell(s) fields are manual entries.
Figure 104. Profile Extrapolations - Processing Toolbox
Thresholds (Figure 105) – Shows an option to set the minimum beam SNR threshold used for
water velocity calculations (default = 1.0 dB). This value corresponds to the minimum SNR val-
ue needed to make a water velocity measurement. In clear water the SNR values are lower, and
an adjustment can be made to the threshold to compensate for low sediment load. Important:
No changes will be made to the calculated discharge or associated data until Apply or Apply to
All has been clicked. Apply only applies the post-processing options to the open/active tab; Ap-
ply to All applies the post-processing changes to all the active tabs.
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