Edit stage discharge measurements
By stage-discharge data is meant condensed results of flow velocity measurements, i.e. stages and discharges, to be used for the establishment of stage-discharge relations.
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- Date of the measurement : year, month, day
- Number of the observation : unique number in a day
- Zero level of the gauge : in m + M.S.L.
- Water level (h) : weighted average water level during the discharge measurement (m)
- Discharge (Q) : in m^3^ /s
- Width : width of the cross-section at the water surface (m)
The following data is not obligatory , but advised to fill in.
- Gradient (dh/dt) : in m/day (mind the sign! ) (if the unsteady flow correction is to be applied)
- Fall : in m (if you selected backwater correction)
- Wetted perimeter (P) : in m
- Cross-sectional area (A) : in m^2^
- Surface Slope (s) : m/m
- Hydraulic Radius : m (computed from R = A/P)
- Velocity (v) : m/sec (computed from v = Q/A)
- Manning's N : (computed from R, s and v)
- Mode of Crossing : 30 characters
- Method of velocity observation : 30 characters
- Number of verticals
- Maximum point velocity: m/sec
- Weather condition : 30 characters
- Wind velocity : km/hr
- Wind direction : Degrees
- Remarks : text
- Flag : yes/no included in rating curve calculation.
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The stage-discharge data file should have following layout:
Line 1
- Station code (format A10) and in column 11: G, F or N:
- if gradients are included
- if fall data are included
- if neither gradient not fall data are included
Line 2
- year, month, day of the measurement
- number of the measurement
- gauge zero (m + M.S.L.)
- water level (m)
- discharge (m^3^ /s)
- gradient (m/day) or fall (m) if G res. F is entered in line 1
- width (m)
- wetted perimeter (m)
- cross-sectional area (m^2^ )
- etc. for the next lines.
Note
- All data should be separated by comma's or blanks. To break off a record (if e.g. the last terms are not available) use /; the omitted values will then be set to the default = 0.
- The data should be in si-units.
Example
Stage-discharge data of station backwt including fall. The records are broken off after the fall. The water levels in this file as well as in the time series are given relative to gauge zero; hence no shift is required and the gauge zero can remain 0.0. The layout of the data file is shown below.
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