30
4.2 Erosion in Ayung Watershed
Results of analysis of DEM map using ArcSWAT show Ayung watershed with an area of 27 446,68 ha,
the number of sub-watershed as much as 29, with the position of the outlets are at the beach of Padanggalak.
Size Sub-watershed, erosion magnitude for each sub- watershed is presented in Table 4.1.
Based on the analysis of 29 sub-watersheds, the sub-watershed that impact of damage sub- watershed is
located in the upper watersheds, namely, sub- watershed numbers: 2, 3, 4, 5, 6, 7, 8, 10, 11 , 12, 13, 14, 16, and
17 sub- watershed of Bangkumg river, Ayung river, Bunutin river, Mengani river, Kilap river, Sidan river,
and Carangsari river with an area of 16410.70 ha 59.79.
As described earlier, improving efforts to reduce erosion can be done by increasing the soil cover with
intercropping or alley farming and strengthening the terrace. Strengthening gulud terrace with patio booster
plant elephant grass, lemon grass and other plants, because of the rain that fell can be retained by the patio
because the amplifier patio plants. Water was given the opportunity to infiltrated, reduce runoff and erosion, so
that environmental damage can be prevented.
Shrub land on steep slopes should be forest with woody plants that have many roots and the like albizia
plants, bamboo, kluwek and so on. Plants that can be grown in the research location, as catchment areas to
reduce environmental damage but have economic value so as to increase farmers income.
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Table 4.1 Size of Each Sub-Watershed, Erosion, and Erosion
Repair Results, CP Value at Ayung Watershed
N o
Name of Sub-Watershed location-Village
Size of Sub-Watershed Erosion
t ha
-1
th
- 1
Erosion of Revision
Result CP Ha
t ha
-1
th
-1
Upstream
1 Sub- Watershed of Sidan river Belok
611,53 2,23
1,61 0,89
2 Sub- Watershed of Bangkung river Tambakan
1812,96 6,61
459,72 19,70
3 Sub- Watershed of Ayung river Ulian
1739,07 6,34
335,13 14,36
4 Sub- Watershed of Ayung river Blanga
635,4 2,32
252,58 10,13
5 Sub- Watershed of Ayung river Catur
1583,33 5,77
182,97 7,84
6 Sub- Watershed of Bunutin river Bunutin
200,36 0,73
665,73 0,63
7 Sub- Watershed of Mengani river Mengani
24,68 0,09
331,70 14,22
8 Sub- Watershed of Mengani river Manikliyu
2216,75 8,08
294,72 12,63
9 Sub- Watershed of Ayung river Bayung Cerik
1016,57 3,70
7,58 0,42
10 Sub- Watershed of. Kilap river Blanga
1102,86 4,02
236,35 10,13
11 Sub- Watershed of Kilap river Antapan
1115,19 4,06
129,35 1,39
12 Sub- Watershed of Sidan river Plaga
1703,97 6,21
163,46 1,75
13 Sub- Watershed of Ayung river Langgahan
697,39 2,54
411,96 17,66
14 Sub- Watershed of Ayung river Kerta
2003,42 7,30
459,73 19,70
15 Sub- Watershed of Carangsari river Sulangai
114,89 0,42
0,62 0,62
16 Sub- Watershed of Sidan river Belok
1525,32 5,56
49,99 21,42
17 Sub- Watershed of Bangkung river Petang
50,92 0,19
221,97 1,52
18 Sub- Watershed of Anak Ayung river Buahan
1237,75 4,51
1,52 0,57
19 Sub- Watershed of Carangsari river Pangsan
585,23 2,13
0,57 0,57
20 Sub- Watershed of Anak Ayung river Puhu
1255,37 4,57
1,23 0,53
Center
21 Sub- Watershed of Carangsari river Carangsari
723,92 2,64
0,53 0,53
22 Sub- Watershed of Medid river Taman
748,24 2,73
0,74 0,74
23 Sub- Watershed of Ayung river Bongkase
650,48 2,37
0,67 0,67
24 Sub- Watershed of Anak Ayung river M Kelod
1440,95 5,25
0,62 0,62
25 Sub- Watershed of Buangga river Mambal
433,91 1,58
0,50 0,50
26 Sub- Watershed of Ayung river Abiansemal
866,03 3,16
0,52 0,52
27 Sub- Watershed of Bangkung river S. Kaja
37,85 0,14
32,29 0,46
28 Sub- Watershed of Bangkung river S. Gede
577,94 2,11
0,62 0,62
Downstreamr
29 Sub-Watershed of Ayung Downstream P.
galak 734,4
2,68 45,73
9,61
Total 27.446,68
100,00
4.3 Analysis of Farmer Income
Kategori