Mule Hole check post

Mule Hole check post is located about 1.5km West of the watershed. The monitoring at the check post consists of :

Figure 1. Meteorological station on the Mule Hole watershed
  • Meterological data of the automatic weather station (Figure 1): temperature (min, max, average), relative humidity (min, max, average), precipitation (total, hourly maximum), wind speed (cumulative, maximum), wind direction, cumulative radiation. Those results are given daily. Hourly temperature, relative humidity, rain, wind, cumulative radiation is also monitored.
  • Rain samples : manually collected by the check post staff each day it is raining.
  • Precipitations measured daily manually at the check post by the staff.

 

 

 

 


The gauging station to calculate surface flow was not set up at the exact outlet of the watershed (which is the cross between the jeep track and the stream) because just upstream this cross there is an opposite slope where the water remains stagnant after a flow event. The following is taken at the outlet:

  • Stream water level (Figure 2): monitored with a Thalimedes every 10 mn
  • Stream samples with the automatic sampler (Figure 2) are collected as soon as the level is higher than 14 cm every 1h30. It stops sampling when the level comes down 14 cm.
Figure 2. Auto-sampler and Thalimedes used in the monitored watersheds
Figure 2. Auto-sampler and Thalimedes used in the monitored watersheds
Figure 3. Mule Hole watershed with piezometers and discharge monitoring station
Figure 3. Mule Hole watershed with piezometers and discharge monitoring station

 

Piezometer Drilling date
Altitude Prof. Hard rock depth
Casing depth Monitor. Instru.
Frequency
(m asl) (m) (m) (m)
P1 10/05/03 826.01 45 30 45 Thalimede 1 h
P2 17/05/03 835.87 45 26 45 Orphimede 1 h
P3 17/05/03 844.55 61 34 61 Manual monthly
P4 17/05/03 856.00 21 20 21
P5 24/07/03 859.90 58 23 24 Manual monthly
P6 24/03/03 881.90 58 17 18 Manual monthly
P7 01/05/04 826.63 20 17 Orphimede 1 h
P8 30/04/04 826.65 18 15 15 Thalimede 1 h
P9 29/04/04 832.70 23 20 20 Manual monthly
P10 28/04/04 832.50 29 26 27 Orphimede 1 h
P11 30/04/04 827.51 16 2 Orphimede
P12 01/12/04 831.20 41 6 Orphimede 15 min
P13 01/12/04 829.01 29 7 Thalimede 1 h

Tableau 1 Caractéristics of the piezometers monitored on the Mule Hole Watershed

  • Water table measurements : most of the borewells are equipped with data loggers that measure the water level every hour P1, P2, P7, P8, P10, P12 and P13. Every time we go for field trip (every month) a manual measurement of all the borewells is taken
  • Groundwater samples : 1 liter bottle collected for each borewell every field trip. pH and electrical conductivity are measured on the field