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Landfill sites selection for municipal solid waste using multi criteria evaluation techniques. Case of Rusizi town, Rwanda

( Télécharger le fichier original )
par Fidele RUGIRAMANZI
National university of Rwanda - Post Graduate Diploma in Applied Geo-Information Science 2013
  

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4.3.2.1. Slope analysis

Fig 4-2: Slope analysis

Source: Author, RNRA/CGIS-NUR

That slope map was created based on the DEM of Rusizi Town. Using spatial analyst tools, the DEM was transformed into slope and after the slope was classified into 2 classes using raster calculator as shown in Fig 3-2 in order to come up with the appropriate slope for constructing a landfill which is about 8-12% because too steep of a slope would make it difficult to construct and maintain while too flat of a slope would affect the runoff drainage. Slopes above 12% created high runoff rates for precipitation. .

25

4.3.2.2. Constrained and permissible areas

Fig 4-3: Constrained and permissible areas

Source: Author, RNRA/CGIS-NUR

The constraint map was produced by merging each individual theme within the study area. This procedure created a constraint map for each theme containing only two classes (suitable land) and (unsuitable land). The 11 constraint maps (layers) namely, River, Lake, Wetland, forest, Roads, Airport, Market, Primary schools, Secondary schools, District hospitals and Health centers were used as shown by Fig 3-3.

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4.3.2.3. Suitable sites in Rusizi Town

Fig 4-4: Distribution of Suitable sites in Rusizi Town

Source: Author, RNRA/CGIS-NUR

That map was created by combining the non restricted area map and slope analysis map as shown in Fig3-4 in order to get the suitable landfill sites in Rusizi town that would be located in the intersection of non restricted area and suitable slope. 133 suitable landfill sites were identified in the town of Rusizi. Their shape length area and shape area are shown in the table 4-4 below.

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Table 4-4: Suitable Sites and their areas (in Sqm)

OBJECT ID

Grid Cod

Shape
Length

Shape Area

 

OBJECT ID

Grid Cod

Shape
Length

Shape
Area

 

OBJECT ID

Grid Cod

Shape
Length

Shape Area

1

1

188.6

1711.6

45

1

355.0

5922.8

91

1

188.6

1711.6

2

1

200.0

2500.0

46

1

188.6

1711.6

92

1

187.5

1601.0

3

1

188.6

1711.6

47

1

283.7

3374.6

93

1

381.4

5010.8

4

1

200.0

2500.0

48

1

353.6

5867.0

94

1

188.6

1711.6

5

1

282.9

3413.5

49

1

188.6

1711.6

95

1

188.6

1711.6

6

1

188.6

1711.6

50

1

188.6

1711.6

96

1

355.0

5922.8

7

1

282.9

3413.5

51

1

188.6

1711.6

97

1

283.7

3374.6

8

1

188.6

1711.6

52

1

188.6

1711.6

98

1

188.6

1711.6

9

1

187.5

1601.0

53

1

188.6

1711.6

99

1

982.6

26915.3

10

1

282.9

3413.5

54

1

188.6

1711.6

100

1

188.6

1711.6

11

1

188.6

1711.6

55

1

188.6

1711.6

101

1

188.6

1711.6

12

1

841.2

29831.5

56

1

188.6

1711.6

102

1

433.8

11155.7

13

1

188.6

1711.6

57

1

188.6

1711.6

103

1

188.6

1711.6

14

1

282.9

3413.5

58

1

188.6

1711.6

104

1

188.6

1711.6

15

1

188.6

1711.6

59

1

188.6

1711.6

105

1

282.9

3413.5

16

1

188.6

1711.6

60

1

188.6

1711.6

106

1

188.6

1711.6

17

1

282.9

3413.5

61

1

188.6

1711.6

107

1

188.6

1711.6

18

1

379.4

5160.5

62

1

283.7

3374.6

108

1

188.6

1711.6

19

1

188.6

1711.6

63

1

188.6

1711.6

109

1

200.0

2500.0

20

1

353.6

5867.0

64

1

646.6

24024.8

110

1

282.9

3413.5

21

1

408.3

8280.5

65

1

282.9

3413.5

111

1

355.0

5922.8

22

1

282.9

3413.5

66

1

188.6

1711.6

112

1

400.0

7500.0

23

1

188.6

1711.6

67

1

188.6

1711.6

113

1

924.0

43540.0

24

1

188.6

1711.6

68

1

188.6

1711.6

114

1

187.5

1601.0

25

1

188.6

1711.6

69

1

282.9

3413.5

115

1

188.6

1711.7

26

1

188.6

1711.6

70

1

282.9

3413.5

116

1

200.0

2500.0

27

1

188.6

1711.6

71

1

188.6

1711.6

117

1

400.0

7500.0

28

1

188.6

1711.6

72

1

188.6

1711.6

118

1

200.0

2500.0

29

1

283.7

3374.6

73

1

188.6

1711.6

119

1

188.6

1711.7

30

1

188.6

1711.6

74

1

188.6

1711.6

120

1

188.6

1711.7

31

1

188.6

1711.6

75

1

188.6

1711.6

121

1

188.6

1711.7

32

1

188.6

1711.6

76

1

188.6

1711.6

122

1

200.0

2500.0

33

1

188.6

1711.6

77

1

188.6

1711.6

123

1

188.6

1711.7

34

1

188.6

1711.6

78

1

188.6

1711.6

124

1

282.9

3413.5

35

1

353.2

5791.9

79

1

188.6

1711.6

125

1

200.0

2500.0

36

1

188.6

1711.6

80

1

381.4

5010.8

126

1

188.6

1711.7

37

1

188.6

1711.6

81

1

282.9

3413.5

127

1

200.0

2500.0

38

1

188.6

1711.6

82

1

188.6

1711.6

128

1

271.7

3488.0

39

1

188.6

1711.6

83

1

188.6

1711.6

129

1

200.0

2500.0

40

1

188.6

1711.6

84

1

355.0

5922.8

130

1

1135.6

52633.1

41

1

282.9

3413.5

85

1

188.6

1711.6

131

1

188.6

1711.7

42

1

188.6

1711.6

86

1

188.6

1711.6

132

1

188.6

1711.7

43

1

188.6

1711.6

87

1

282.9

3413.5

133

1

379.4

5160.5

28

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