1. L.K. Amekudzi, W. Agyakwah, Y. Bashiru, E. Quansah
Meteorology and Climate Science Unit, Department of Physcis, KNUST
Email: lkamekudzi.sci@knust.edu.gh
Comparison of QWeCI Automated and
GMet Non-automated Rain Gauges at
Different Observatories in Kumasi

2. 2
OUTLINE
 Introduction
 Methodology
 Results and Discussion
 Conclusions

3. 3
Introduction
• Accurate observation and reliable rainfall data is a
key for understanding impact of rainfall on climate.
• Check the accuracy and internal consistency of new
rain gauges
• Cross validation
• Understanding of rainfall variation in Kumasi

4. 4
STUDY AREA

5. 5
Standard
Meteorolog
ical Rain
gauge
Pluvio Rain gauge
Tipping
Bucket Rain
gauge
METHODOLOGY

6. 6
0.00
50.00
100.00
150.00
200.00
250.00
300.00
June July October November December
MonthlyRainfall(mm)
Months
0
50
100
150
200
250
300
350
400
MonthlyRainfall(mm)
Months
AUTOMATED AND GMET RAIN GAUGES
 Airport
Pluvio
 Agromet
Pluvio
 Owabi
Pluvio
 Emena
Pluvio
 Airport
SMR
 Agromet SMR  Owabi
SMR

7. 7
r = 0.928
0.0
10.0
20.0
30.0
40.0
50.0
60.0
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0
GMET
TIPPING BUCKET
DAILY COMPARISM BETWEEN INSTRUMENTS AT OWABI

8. 8
r = 0.990
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
GMET
PLUVIO
DAILY COMPARISM BETWEEN INSTRUMENTS AT AIRPORT

9. 9
r = 0.986
-20.0
0.0
20.0
40.0
60.0
80.0
100.0
120.0
0 20 40 60 80 100 120
GMET
PLUVIO
DAILY COMPARISM BETWEEN INSTRUMENTS AT AGROMET

10. 10
CONCLUSION AND RECOMMENDATIONS
• Owabi, Airport and Agromet recorded the highest rainfall in June,
October, and July respectively.
• The lowest rainfall amounts were observed in July at Owabi and in
December at Airport and Agromet.
• Perfect agreement between automated and non-automated rain
gauges
CONCLUSION
STATION CORRELATION
OWABI 0.928
AIRPORT 0.990
AGROMET 0.985

11. 11
• Consistent calibration
•Diameter of the instruments should be the same(Throat)
• Study should be continued for longer period of years
RECOMMENDATIONS

12. 12
THANK YOU