UPDATED: September 21, 2000
STATUS OF INSTRUMENTATIONS
| CR10 Datalogger | The
electronic functioning is well set. The compiled program currently loaded
is ac000729.dld (links need to be
updated if any change) . It' source file is ac000729.csi,
and to better understand its working way it's possible to refer to a
previous version of the same program with several comments: 800weir.csi
The program need to be updated to take in account the flow rate |
| 12 V DC Battery | Properly working |
| Photovoltaic cell panel | Properly working |
| Electric rain gauge (tipping bucket) |
Test calibration run on July 2000. The rain gauge resulted to have an average error of 6 hundredths out of 1 in of rain detected, with a standard deviation of 0.030 over collected data. This error was considered acceptable. If more similar test will need to be done in the future it is advisable to follow the "Calibration#2" worksheet scheme on the "Tipping bucket calibration" Excel spreadsheet. Rain in taking hole in bucket cap need to be kept clean at least weekly from guano and any other clogging. |
| Two stilling wells | They can give correct water level variation signals to CR10 |
| V-notch weir | Small
flow rates are measured by the triangular (V-notch) weir.
As far as the amount of flowing water grows up the discharge measured by the whole triangular section need to be added to the one of the upper rectangular sections.
Notice that only the upstream stilling well is useful for a reliable water level as for the flow rate measuring function of the weir. Because the dowstream stilling well is too far and placed after the culvert it is not possible to take in account properly the head looses from the immediate weir downstream to the well position. This implies that only a direct, non submerged flow can be measured |
| ISCO automatic water sampler |
Not present |