Perhitungan Erosi Lahan Sub-DAS kali Serang

6. Mediteran merah kuning dan Grumusol dari batu bekuan

5.2.2 Perhitungan Erosi Lahan Sub-DAS kali Serang

Dari Badan meteorologi dan geofisika (stasion hidro- metri DAS Kedung Ombo), Proyek induk Pengembangan Wilayah Sungai Jratunseluna (Dept.PU) Semarang, dan Pusat Peneli tian Pengembangan Pengairan (Dept.PU) Bandung, serta Lembaga Penelitian Tanah Bogor, diperoleh data-data sekunder yang meliputi; peta topografi, peta geologi,

b Z

Peta curah hujan dan peta tata guna lahan ("land used").

Data-data tersebut dibuat deskripsinya berupa peta pada Plot sub-DAS kali Serang, yang meliputi peta erosivitas hujan, peta erodibilitas tanah, peta panjang lereng dan

Peta kemiringan lahan , dan peta pola pertanian/tanaman.

Peta-peta tersebut dimaksudkan sebagai acuan dalam perhi tungan erosi lahan dengan menggunakan formula USLE.

Perhitungan erosi didasarkan pada sistem grid (jaringan), dengan mengevaluasi tiap pias, harga-harga erosivitas,

erodilbilitas tanah, kemiringan lereng dan faktor tana- mannya, maka dapat diperkirakan besarnya erosi pada tiap unit map tersebut. Sebagaimana dijelaskan lebih detail dan sistematis pada Contoh perhitungan erosi lahan dengan formula USLE berikut ini; (perhatikan gambar 5.2, gambar

5.3, gambar 5.4 dan gambar 5.5).

Untuk petak AB-23

diketahui harga dari data peta tersebut diatas;

Erosivitas (R) = 220fJ mm/ha/jam/th Erodibilitas (K) = 0,026 ton ha jam/mm

Faktor kemiringan (LS) = 8,82

Pengelolaan tanaman (CP\ - n a .

n k^> - 0,63 , pada erosi potensial CP

dianggap 1.

Luas Unit AB-23 = 2 ha

Erosi potensial (P) = R.K.LS.CP

= 2200 . 0,026 . 8,82 . 1

- 504,504 ton/ha/th

> 330 ton/ha/th

(klasifikasi erosi sangat berat)

Erosi aktual (A) = R . K . LS . CP

= 2200 . 0,026 . 8,82 . 0,63

= 317,838 ton/ha/th

> 125 s/d 330 ton/ha/th

(klasifikasi erosi berat).

Total erosi potensial = (P) . Luas unit

= 504,504 . 2

= 1009,006 ton/th

Total erosi aktual = (A) . Luas unit

= 317,838 . 2

= 635,675 ton/th

Hasil perhitungan erosi lahan pada sub-DAS kali Serang hulu ini secara keseluruhan dapat dilihat pada tabel 5.1.

tj-4

Tabel 5.1 Hasil perhitungan erosi lahan daerah aliran sunoai KfiDr=™ ^""" Bun»ai *- Serangdenganformula U8LE.

Faktor jFaktor I Faktor Erodi I L8 I CP

bilrty

AC-21 2200

22 2200

-25

0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0,0260 0.0260 0,0260

8,82 8,82

0,6300 0,6300

0,6300 0.6300 0,6300 0,6300 0.6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300

0.6300 J

0,6300 0,6300 0,6300 0,6300 0,6300 0.6300 0,6300

0,0260 2,40

0,0260 0,0260 0,0260 0,0260 0,0260 0,0132 0,0132 0,0132 0,0260 0,0260 0,0260 0,0260 0,0260 0,0132 0,0132 0,0132 0,0132 0,0260 0,0260 0,0260 0,0260 0,0260

8,82 8,82 13,29 13,29 13,29

2425

0,0132 0,0132 0,0132 0,0132 0,0260 0,0260 0,0260 0,0260 0,0260

2300 0,0132

2400 0,0132

2425 0,0132

2450 0,0132

2475 0,0260

AJ-15J 2250 0,0132 240 -16} 2300 J 0,0132) 2,40

0,6300 0,8300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0.6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300 0,6300

Eroai Potonoial A-R.K.LS

(torVhaAh)

504,504 504,504 137,260 504,504 504,504 504,504 504,604 137,280 137,280 504,504 i 504,5041 760,188 760,188

137.280 137,280 137,280 504,504 511,384 774,010 777,4651 777,465|

69,696 69,898 71,280 141,024 521,703 786,104 786,104 786,104 69,696 71,280 71,280 73,656 146,640 148,200 544.635 544,635 544,635

72,072 72,864 74,448 76,032 149,760 151,320 151,320 151,320 151,320 72,864 72,864 76.03a 76,824 77,616 154,440 154,440 154,440 154,440 71,280 72,864

Erosi

Aktual (A) =

R.K.L8.CP

(ton/haAh)

317,838 317,838 86,486 317,838 317,838 317,838 317,838 86,486 86,486 317,838 317,8381 478,9181 478.9181

86,486 86,486 86,486 317,838 322,172 487,626 489,803 489,803 43,908 43,908 44,906 88,845 328,673 495,245 495,245 495,245 43,908 44,906 44,906 46,403 92,383 93,366 343,120 343,120 343,120 45,405 45,904 46,902 47,900 94,349 95,332 95,332 95,332) 95,332 45,904 45,904 47,900 48,399 48,898 97,297 97,297 97,297 97,297 44,906 45,904

Luas Unit (ha)

Total erosi (tonAh)

Potensial _Aktual

1009,008 2522,520 274,560 7567.560 12612,600 50450,400 1009,008 274,560 1372,800 50450.400 50450,400 76018,800 19004,700 274,560 1372.800 13728,000 50450,400 51138,360 77400,960 77746,500 19436,625

635,675 1589,188 172,973 4767,563 7945,938 31783,752 635,675 172,973 864,864 31783,752 31783.752 47891,644

11972,961 I

172,973 864.864 8648,640 31783,752 32217,167 48762,605 48980,295 12245,074

1045,440 6969,600 7128,000 14102,400

! 52170,300 78610,350 78610,350 19652,588

348,480 7128,000 7128,000 7365,600 14664,000 14820,000 54463.5001 54463,500

2723,175

1081,080 7286,400 7444,800 7603,200 14976,000 15132,000 15132,000 15132,000 756,600 364,320 7286,400 7603,200 7682,400 7761,600 15444,000 15444,000 15444,000 772,200 356,400 1821,600

658,627 4390,848 4490,640 8884,512 32867.289 49524,520 49524,520 12381,130

219,542 4490,640 4490,640 4640.328 9238,320 9336,600 34312,005 34312,005 1715,600

681,080 4590,432 4690,224 4790,016 9434,880 9533,160 9533,160 9533,160 476,658 229,522 4590,432 4790,016 4839,912 4889,808 9729,720 9729,720 9729,720 486,486 224,532 1147,608

Kelas Bahaya erosi

Potensial

SB SB

B SB SB SB 8B

B B SB SB SB SB

B B B SB SB SB SB SB

S S S B SB SB SB SB

S S S S B B SB SB SB

S S S S B B B B B

S S S S s B B B B

K K

Aktual

B B

S B B B B

8 8 B B 8B SB

S S S B B SB SB SB

K K K 8 B SB SB SB

K K K K S S SB SB SB

K K K K S S S S 3

K K K K K S S s s

K K

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