Edit flow measurements
Current meter data
The hymos Data Edit and Entry function 'Current meter data' allows you to add, edit and delete coefficients for a calibrated current meter instrument. The information stored includes:
Flow measurements^image049.jpg!
- Instrument type, number, make and manufacturing date.
- Calibration period and person who calibrated the instrument.
- Coefficients of the current meter calibration equation and period for which the entered equation is valid (this is important for later use, HYMOS checks on these dates).
- Remarks, text can be added in the text box showing when pressing this button.
Press <Save> to save the entered information in the database, <Delete> to delete an equation from the database, <Close> to leave the window without saving.
Flow Measurement Data
Flow measurements can be added with 'flow measurement data' function from the 'Edit and Entry' function map. The data entered or edited will not be stored in the HYMOSdatabase but in separate files (extension *.flw).
Flow measurements^image051.jpg!
The entered data includes:
Measurement date and time
Duration of measurement in minutes
Observation Number
Unit: metric or imperial
Computation of total flow: mean section method, or mid-section method
distance from reference point
width of river
level of gauge zero
water level (rel. to gauge zero) at start of measurement
water level at end of measurement
water level difference with downstream station, only required if backwater correction is required, else 0.
vertical number, distance from reference point and water depth
measuring depth, number of rotations duration of single point measurement
airline length, vertical angle, horizontal angle
To edit an existing flow measurement file, double-click on the filename text box and select a file with the windows file open dialogue.
Add a flow measurement by filling in the text boxes and making your selection concerning the discharge computation method and units. Enter the number of verticals and per vertical the number of measuring points. After entering all values give a filename and press <Save> to save your data.
The Layout of the flow measurements file (.flw) is as follows
Line 1
Position
01 ‑ 03 number of the measurement
04 ‑ 07 year (yyyy) +
09 ‑ 10 month (mm) +date of measurement
12 ‑ 13 day (dd) +
15 ‑ 16 hour (hh) +time of measurement at start
18 ‑ 19 minute (mi) +
20 ‑ 22 duration of measurement in minutes
25 unit: metric(0) or imperial(1)
28 type of measurement:
1‑6 = point measurements according to ISO standard, where the type number corresponds with the number of points in the vertical
7 = point measurements with free distance between points in the vertical (number of points £10)
8 = moving boat: method vv‑a
9 = moving boat: method vb‑vv
31 comp. of total flow: 1= mean section method, or
2= mid‑section method
Line 2 - Point velocity measurements (type £ 7).
Position:
01 ‑08 distance from reference point
09 ‑16 width of river
17 ‑24 level of gauge zero
25 ‑32 water level (rel. to gauge zero) at start of measurement
33 ‑40 water level at end of measurement
41 ‑48 water level difference with downstream station, only required if backwater correction is required, else 0.
Line 3 - Point velocity measurements (type £ 7).
Position:
01 ‑04 vertical number + only for first point
05 ‑12 distance from reference point + in vertical water depth
13 ‑20 water depth + is required, else 0.
21 ‑25 measuring depth (relative depth for types < 7, actual depth for type = 7)
26 ‑30 number of rotations
31 ‑35 duration of single point measurement
36 ‑40 airline length +
41 ‑45 vertical angle + in case of airline length correction
46 ‑50 horizontal angle +
Line 2 - Moving boat (type ³ 8):
Position
01 ‑08 distance from reference point
09 ‑16 width of river
17 ‑24 width according to moving boat measurements
25 ‑32 level of gauge zero
33 ‑40 water level (rel. to gauge zero) at start of measurement
41 ‑48 water level at end of measurement
49 ‑56 current meter depth
57 ‑63 water level difference with downstream station, only required if backwater correction is required, else 0.
64 ‑72 coefficient in power profile
Line 3 - Moving boat (type ³ 8)
Position
01 ‑04 vertical number + only for first point
05 ‑12 distance from reference point + in vertical water depth
13 ‑20 water depth + is required, else 0.
21 ‑25 angle (type=8) or boat velocity (type=9)
26 ‑30 number of rotations
31 ‑35 duration of measurement
