Mule Hole Watershed

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 :

  • f1-station météorologique

    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.

Mule Hole Outlet

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.
f2- Echantillonneur automatique et Thalimède

Figure 2. Auto-sampler and Thalimedes used in the monitored watersheds

f3-localisations des piézomètres et stations de suivi

Figure 3. Mule Hole watershed with piezometers and discharge monitoring station

Piezometer Drilling
date
Altitude Depth of Drilling Hard rock Depth Depth of Casing Height where slots are present from bottom of casing Instrument for monitoring Frequency of measure
    m asl m m m m    
P1  10/05/03 826.01 45 30 45 39 Thalimedes 1h
P2 17/05/03 835.87 45 26 45 39 Orphimedes 1h
P3 17/05/03 844.55 61 34 61 55 Manual monthly
P4 17/05/03 856.00 21 20 21 15 - -
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 14 Orphimedes 1h
P8 30/04/04 826.65 18 15 15 12 Thalimedes 1h
P9 29/04/04 832.70 23 20 20 17 Manual monthly
P10 28/04/04 832.50 29 26 27 24 Orphimedes 1h
P11 30/04/04 827.51 16 - 2 - Orphimedes -
P12 01/12/04 831.20 41 - 6 - Orphimedes 15 min
P13 01/12/04 829.01 29 - 7 - Thalimedes 1h

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.