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Areal precipitation by Theissen and isohytal method using QGIS
Group Members:
 Muhammad Ali Khawaj
 Attique Younis Awan
 Khalil ur Rehman
 Shahbuddin
 Aamer Ali
 Mardan Irrigation Dept = 100.4mm
 Forest Peshawar = 466.3mm
 Kohat station = 625.8mm
 Karak = 331.72mm
Guages Locations & AAR:
Isohyetal Method
Delimeted Text File:
Working in QGIS:
 Open delimeted file>Interpolation>Contouring
 Using measure tool.
Area Calculation:
Precipitation (P) Area (A)
P1 =200 mm A1 = 2345.25 km2
P2 =300 mm A2 =1849.65 km2
P3 =400 mm A3 =1178.10 km2
P4 =500 mm A4 =3277.23 km2
P5 =600 mm A5 =3885.79 km2
P6 =400 mm A6 =508.13 km2
A7=2053.45 km2
A8 =2576.76 km2
 P =
1
A i=1
n
P1+P2
2
A1 +
P2+P3
2
A2 +  +
Pi+Pi1
2
Ai
 P =
7215200
17674
 P =417.2 mm Answer
FORMULA:
Theisen Polygon Method
QGIS:
 Made triangles> area> bisectors
Area Calculation:
  = 基
 P =
3496.796466.3
9688.019
+
2150.575100.4
9688.019
+
1058.209331.72
9688.019
+
2982.439625.8
9688.019
 P = 430.59 mm Answer
S.no Areas km2
1 3496.796
2 2150.575
3 1058.209
4
Total Area:
2982.439
-------------
9688.019
Areal precipitation by Theissen and isohytal method using QGIS

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Areal precipitation by Theissen and isohytal method using QGIS

  • 2. Group Members: Muhammad Ali Khawaj Attique Younis Awan Khalil ur Rehman Shahbuddin Aamer Ali
  • 3. Mardan Irrigation Dept = 100.4mm Forest Peshawar = 466.3mm Kohat station = 625.8mm Karak = 331.72mm Guages Locations & AAR:
  • 6. Working in QGIS: Open delimeted file>Interpolation>Contouring
  • 7. Using measure tool. Area Calculation: Precipitation (P) Area (A) P1 =200 mm A1 = 2345.25 km2 P2 =300 mm A2 =1849.65 km2 P3 =400 mm A3 =1178.10 km2 P4 =500 mm A4 =3277.23 km2 P5 =600 mm A5 =3885.79 km2 P6 =400 mm A6 =508.13 km2 A7=2053.45 km2 A8 =2576.76 km2
  • 8. P = 1 A i=1 n P1+P2 2 A1 + P2+P3 2 A2 + + Pi+Pi1 2 Ai P = 7215200 17674 P =417.2 mm Answer FORMULA:
  • 10. QGIS: Made triangles> area> bisectors
  • 11. Area Calculation: = 基 P = 3496.796466.3 9688.019 + 2150.575100.4 9688.019 + 1058.209331.72 9688.019 + 2982.439625.8 9688.019 P = 430.59 mm Answer S.no Areas km2 1 3496.796 2 2150.575 3 1058.209 4 Total Area: 2982.439 ------------- 9688.019