This document summarizes fieldwork conducted on water quality control in the River Geul basin in South Limburg, Netherlands. Flow measurements were taken at various points along the Gulp, Selzerbeek, Eijserbeek and Geul rivers using propeller meters, salt dilution, and fluorescent dye methods. Total flows were calculated and compared at key points finding small deviations, likely due to human error. The document describes the fieldwork methodology, presents maps of the study area and river systems, and tables of flow measurements and calculations at different locations in the basin.

1. Water Quality Control in River Geul Basin Fieldwork South Limburg, The Netherlands
M.Sc. Participants of the UWS program 2013/2015 session 1

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3. 3
Location Map of the Study Area

4. 4
Map of the Rivers Simpleveld
WWTP
Eijserbeek
Selzerbeek
Geul
(upstream)
Gulp
Confluence

5. 5
- Propeller Method
- Orange
- Salt Dilution
Figure 1: Propeller Method
Figure 2: Orange Method Figure 3: Salt Dilution

6. Flow (m3/s)
Location
Orange
Method
Salt Dilution
Propeller
(avg.)
Gulp 20 (B) 0.51 - 0.19
Gulp 21 (D) 0.13 - -
Selzerbeek 31 (E) 0.035 - 0.061
Eiserbeek 45 (D) 0.039 - -
Eijserbeek 40 (D) - - 0.087
Point 1 (Upstream of
the WWTP (E&C)
- 0.019
-
Geul 10 confluence (E) - - 1.49
Geul 11 (E) - - 0.53
Geul 12.1 (C) - - 0.415
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7. Wednesday
Weir size:
b= 1m
h= 0.093m
Q=1.91H^(3/2) W= 0.05m3/s
54.2L/s Thursday
Weir size:
b= 1m
h= 0.135m
Q=1.91H^(3/2) W= 0.09m3/s
94.7L/s
The flow increased overnight
because of the rain
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8. Name of the River Flow Unit
Selzerbeek 0.610 m3/s
Geul 12.1 0.415 m3/s
Eijerbeek 0.105 m3/s
Gulp 0.212 m3/s
Total Flow = 1.342 m3/s
Geul 10 (at the confluence) 1.492 m3/s
Deviation = 0.150 m3/s
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10. 10
• Interpretation of data
• Human error
• Flow Pattern

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