precipitation analysis of dallas county
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Precipitation Analysis of Dallas County
- Poolkeshi Patel
To compare the radar derived rainfall data with the actual rain gauge data.
Importance of accurate quantification of rainfall.
Is the data from the virtual rain gauges a good representation of the actual rainfall in the county?
Objectives
Data Acquisition using Hydro Desktop Data processing using GIS Analysis Results
Methodology :-
Rainfall Data from Virtual Gauges
Rainfall data from Actual Gauges
Source :- NWS-WGRFC
NOAA’s National Weather Service
Source :- USGS – NWIS
National Water Information System
Data available over the entire region.
Data available at very few locations.
Location of the virtual & actual stations
1/3/20
07 0:
00
1/17/2
007 0
:00
2/1/20
07 0:
00
2/17/2
007 0
:00
3/12/2
007 0
:00
3/26/2
007 0
:00
3/31/2
007 0
:00
4/13/2
007 0
:00
4/24/2
007 0
:00
5/2/20
07 0:
00
5/9/20
07 0:
00
5/15/2
007 0
:00
5/24/2
007 0
:00
5/27/2
007 0
:00
5/30/2
007 0
:00
6/3/20
07 0:
00
6/15/2
007 0
:00
6/18/2
007 0
:00
6/22/2
007 0
:00
6/27/2
007 0
:00
6/30/2
007 0
:00
7/4/20
07 0:
00
7/13/2
007 0
:00
7/22/2
007 0
:00
8/1/20
07 0:
00
9/3/20
07 0:
00
9/9/20
07 0:
00
10/8/2
007 0
:00
10/16
/2007
0:00
11/24
/2007
0:00
12/9/2
007 0
:00
12/14
/2007
0:00
12/27
/2007
0:00
0
0.5
1
1.5
2
2.5
3
3.5Precipitation Data from actual stations
Prec
ipita
tion
(inch
es)
inchesMean 0.377732Standard Deviation 0.520523Median 0.17Variance 0.270944
1/4/20
07 6:
00
1/14/2
007 6
:00
1/18/2
007 6
:00
1/21/2
007 6
:00
2/2/20
07 6:
00
2/25/2
007 6
:00
3/26/2
007 7
:00
3/31/2
007 7
:00
4/14/2
007 7
:00
5/1/20
07 7:
00
5/4/20
07 7:
00
5/10/2
007 7
:00
5/19/2
007 7
:00
5/25/2
007 7
:00
5/28/2
007 7
:00
5/31/2
007 7
:00
6/5/20
07 7:
00
6/17/2
007 7
:00
6/22/2
007 7
:00
6/27/2
007 7
:00
6/30/2
007 7
:00
7/3/20
07 7:
00
7/6/20
07 7:
00
7/14/2
007 7
:00
7/27/2
007 7
:00
8/1/20
07 7:
00
8/18/2
007 7
:00
8/31/2
007 7
:00
9/6/20
07 7:
00
9/27/2
007 7
:00
10/7/2
007 7
:00
10/16
/2007
7:00
11/23
/2007
6:00
11/26
/2007
6:00
12/13
/2007
6:00
12/27
/2007
6:00
0
1
2
3
4
5
6 Precipitation Data from virtual stationsPr
ecip
itatio
nin
ches
inchesMean 0.099924Standard Deviation 0.337801Median 0Variance 0.114109
Interpolation of the actual rain gauges data
Kriging0.010214314 - 0.056635522
0.056635522 - 0.103056731
0.103056731 - 0.149477939
0.149477939 - 0.195899147
0.195899147 - 0.242320355
0.242320355 - 0.288741564
0.288741564 - 0.335162772
0.335162772 - 0.38158398
0.38158398 - 0.428005189
Interpolation of the virtual rain gauges data
Krigging0.126986325 - 0.182572113
0.182572113 - 0.238157902
0.238157902 - 0.29374369
0.29374369 - 0.349329478
0.349329478 - 0.404915267
0.404915267 - 0.460501055
0.460501055 - 0.516086843
0.516086843 - 0.571672632
0.571672632 - 0.62725842
underestimates overestimates
overestimates
Distribution of the rainfall over the county is underestimated by the virtual rain gauges.
Analysis
To look at a storm event and try to quantify the contribution of rainfall to the watershed in the county as a representative of the actual or virtual rain gauges.
Concluding Work
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