BAB IV ANALISIS DATA HIDROLOGI

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1 BAB IV ANALISIS DATA HIDROLOGI 4. Data DAS Luas DAS Keduag dhtug dar lokas recaa bagua pegedal sedme d Suga Keduag Desa Bragkal, adalah sebesar 64,8 km dega kemrga rata-rata,05%. Pajag suga utama mecapa 4,85 km dega ketgga suga dbaga hulu adalah 690 m, sedagka ketgga suga dbaga hlr adalah 40 m (kemrga suga sebesar 0,08). 4. Data Curah Huja Data curah huja dambl dar 6 stasu huja yag terletak d DAS Keduag, yatu Stasu Ngadrojo, Stasu Grmarto, Stasu Jatpuro, Stasu Jatsroo, Stasu Slogohmo, da Stasu Jatroto. Data curah huja maksmum tap-tap stasu dar tahu 988 sampa tahu 007 dsajka pada Tabel 4.. Tabel 4. Data Curah Huja Maksmum DAS Keduag No Th Ngadrojo Grmarto Jatpuro Jatsroo Slogohmo Jatroto Sumber: Bala PSDA Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 77 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

2 4. Perhtuga Curah Huja Hara Maksmum DAS Dega Metode Thesse Berdasarka hasl pegukura peta rupa bum Woogr secara maual dega kertas mlmeter blok traspara ddapatka luas pegaruh masg-masg stasu huja, dmaa luas pegaruh stasu huja Ngadrojo sebesar 65,84 km dega koefse thesse sebesar 0,807, sedagka luas pegaruh stasu huja Grmarto sebesar 7,7 km dega koefse thesse sebesar 0,0. Luas pegaruh da koefse thesse dar masg-masg stasu huja dsajka pada Tabel 4.. Tabel 4. Luas Pegaruh Stasu Huja Terhadap DAS Serayu No Stasu Huja Luas Pegaruh (km) Koefse Thesse Ngadrojo 65,84 0,807 Grmarto 7,7 0,0 Jatpuro 4,8 0,85 4 Jatsroo 0,08 0,055 5 Slogohmo 86,47 0,7 6 Jatroto,65 0,064 Total 64,8 luas DAS 64,8 Sumber: Perhtuga Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 78 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

3 GIRIMARTO JATIPURNO JATISRONO 4 SLOGOHIM0 5 Check Dam Bragkal NGADIROJO JATIROTO 6 Gambar 4. Peta DAS Keduag Da Polgo Thesse Perhtuga curah huja rata-rata hara maksmum dega metode thesse megguaka rumus sebaga berkut: Rh = W (.) R + W R + W R + W4 R4 + W5 R5 + W6 R6 Perhtuga: Rh988 = 0, , , , , , Rh 988 = 99,60 mm Perhtuga curah huja rata-rata hara maksmum dega metode Thesse utuk tahu dsajka dalam Tabel 4.. Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 79 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

4 Tabel 4. Perhtuga Curah Huja Rata-Rata Hara Maksmum Tap Stasu Tahu Ngadrojo Grmarto Jatpuro Jatsroo Slogohmo Jatroto Rmaks Tgl (mm) May Feb Feb Ja Nov May Ja Nov Ju Dec Dec Feb Ja Nov Feb Apr Ja Mar Feb Dec Dec kt Dec Feb Mar Aug Nov Ja Apr Mar Apr Apr Feb Ja Feb Mar Mar Mar Mar Nov Nov Feb Feb Feb Mar Mar Feb Dec Feb Ja Dec Nov Feb Sumber: Perhtuga Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 80 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

5 Lajuta Tabel 4. Tahu Ngadrojo Grmarto Jatpuro Jatsroo Slogohmo Jatroto Rmaks Tgl Ju Feb Feb Oct Nov Apr Dec Nov Feb Apr Apr Nov des Feb Mar Mar Mar Ja Mar Mar Apr Apr Feb Ja Dec Ja Feb Dec Nov Nov Nov Mar Oct Mar Feb Mar Mar Dec Dec Feb Feb Nov Des Sumber: Perhtuga Ket: IIIII : Huja maksmum IIIIII : Data huja tdak ada karea alat rusak yag telah ds dega rumus Recprocal Method Dar hasl perhtuga pada Tabel 4. dapat dketahu, bahwa pada tahu 988 terjad huja maksmum sebesar 99,60 mm pada taggal 5 Februar. Data curah huja rata-rata hara maksmum DAS Keduag hasl perhtuga dega metode Thesse dar tahu 988 sampa 007 dsajka dalam Tabel 4.4 Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 8 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

6 Tabel 4.4 Hasl Perhtuga Curah Huja Rata-Rata Hara dega Metode Thesse Tahu Rmaks (mm) Tgl Tahu Rmaks (mm) Tgl Feb Ju Ju Dec Dec Feb Dec Mar Feb Feb Ja Feb Ja Nov Feb Mar Feb Nov Feb Dec Sumber: Perhtuga 4.4 Perhtuga Curah Huja Recaa 4.4. Peetua Parameter Statstk Perhtuga parameter-parameter statstk X, ( X X ), ( X X ), da = 4 dsajka dalam Tabel 4.5. ( X X ) Tabel 4.5 Perhtuga Parameter Statstk Data Curah Huja Hara Maksmum No Tahu X (X-X) (X-X) (X-X) (X-X) Jumlah Rata-rata (X) Sumber: Perhtuga Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 8 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

7 Hasl perhtuga parameter-parameter statstk utuk besara logartma pada Tabel 4.6 adalah X sebesar 6.704, ( X X ) sebesar , 4 ( X X ) sebesar 050.4, da ( X X ) sebesar Hasl perhtuga Tabel 4.5 kemuda dguaka utuk meghtug parameter statstk X, Sd, Cs, Cv da Ck yag dsajka dalam Tabel 4.6 Tabel 4.6 Parameter Statstk Parameter Huja Rata-rata X = X Nla 6,704 Stadar Devas Sd = X X 8,64 Koef. Skewess Koef. Varas ( X X ) Cs = ( )( ) S Sd Cv = X 0,999 0,97 Koef. Kurtoss Ck = (Sumber: Perhtuga) 4 X X 4,40 ( ) ( ) ( ) S Perhtuga parameter-parameter statstk log X, (log X log X ), 4 (log X log X ), da (log X log X ) dsajka dalam Tabel 4.7. Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 8 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

8 Tabel 4.7 Perhtuga Statstk (Logartma) Curah Huja Hara Maksmum No Tahu X log X (logx-logx) (logx-logx) (logx-logx) (logx-logx) Jumlah Rata-rata (log X).78 Sumber : Perhtuga Hasl perhtuga parameter-parameter statstk utuk besara logartma pada Tabel 4.7 adalah log X sebesar,78, (log X log X ) sebesar 0,876, (log X log X ) 4 sebesar 0,000, da (log X log X ) sebesar 0,0080. Hasl perhtuga pada Tabel 4.7 kemuda dguaka utuk meghtug parameter statstk X, Sd, Cs, Cv da Ck yag dsajka dalam Tabel 4.8 Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 84 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

9 Tabel 4.8 Parameter Statstk (Logartma) Parameter Huja Rata-rata log X = log X Nla,780 Stadar Devas Sd = log X log X 0, Koef. Skewess Koef. Varas Cs = Sd Cv = X (log X log X ) ( )( ) S 0,8 0,069 Koef. Kurtoss Ck = Sumber : Perhtuga log X log X =,49 ( ) ( ) ( ) S Pemlha Jes Sebara Setelah dketahu parameter statstk dar data curah huja maksmum tahua melalu perhtuga d sub-bab 4.4., maka dapat dtetuka metode dstrbus maa yag dapat dpaka, pemlha jes sebara dsajka dalam Tabel 4.9. Tabel 4.9 Pemlha Jes Sebara Jes Dstrbus Syarat Perhtuga Kesmpula Normal Cs 0 Cs = 0,999 Medekat Ck = Ck = 4,40 Medekat Gumbel Cs,96 Cs = 0,999 Medekat Ck 5,400 Ck = 4,40 Medekat Log Pearso Cs (logx) 0 Cs = 0,8 Memeuh Ck (logx) =,5(Cs(logX) ) + =,009 Ck =,05 Medekat Log Normal Cs (logx) 0 Cs = 0,8 Medekat Ck (logx) = Ck=,49 Medekat Sumber : Perhtuga Berdasarka Tabel 4.9 utuk dstrbus peluag Log Pearso Type III parameter statstk Cs = 0,8 memeuh persyarata Cs (logx) 0 da parameter statstk Ck=,05 medekat persyarata Ck(logX)=,5x(Cs(logX) ) + =,009. Perhtuga curah huja recaa dtetuka megguaka dstrbus log pearso type III. Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 85 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

10 4.4. Peguja Sebara dega Metode Ch Kuadrat Peguja sebara dega metode ch square kuadrat megguaka rumus sebaga berkut: O E X Cr = (.0) E Tabel 4.0 Nla Log X No Log X Log X Urut No Log X Log X Urut,998,556,875,770,77,6,7,798,556,648,7,845 4,648,677 4,6,848 5,845,699 5,848,86 6,798,7 6,7,870 7,79,7 7,890,875 8,86,7 8,870,890 9,770,77 9,699,998 0,677,79 0,06,06 Sumber: Perhtuga Perhtuga: K = +, log = +, log 0 = 5, 0 Dk = K R (.) R dtetuka sebesar (utuk dstrbus log pearso) Dk = 0 = 8 E X X awal = R = 0 = = K 0 terbesar R K terkecl,06,556 = = 0,05 0 = X m X =,556 ( 0,05) =,59 Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 86 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

11 Dar hasl perhtuga datas dapat dlakuka perhtuga peguja sebara dega metode ch square kuadrat yag dsajka dalam Tabel 4.. Tabel 4. Perhtuga Ch Square Test Nla batas tap kelas E O (O-E) (O-E) /E,59<X<,58 0.5,58<X<,66 0.5,66<X<, ,689<X<, ,74<X<, ,796<X<, ,850<X<,90 4 4,90<X<, ,956<X<,00 0.5,00<X<, Sumber: Perhtuga Dar perhtuga pada Tabel 4. ddapat la X Cr aalts sebesar 5. Utuk Dk = 8, sgfkas (α) = 5%, dar Tabel.5 ddapat harga X Cr = 5,507. Karea la X Cr aalts kurag dar X Cr tabel (5 < 5,507), maka pemlha melalu dstrbus Log Pearso III memeuh syarat Curah Huja Recaa Perhtuga curah huja recaa dega metode Log Pearso type III megguaka rumus sebaga berkut: LogR = Log X + k Sd (.6) Harga k tergatug la Cs yag sudah ddapat. Dega la Cs yag ddapat dar perhtuga pada sub-bab 4.4. adalah sebesar 0,8 da perode ulag 50 tahu, maka dar terpolas la k pada Tabel.4 ddapat la k sebesar,0. Perhtuga: LogR =,780+ (,0 0,) =,05 R 50 =,088 mm Perhtuga curah huja recaa tap perode T tahu dega metode log pearso tpe III dsajka pada Tabel 4.. Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 87 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

12 Tabel 4. Curah Huja Recaa Perode Ulag T Tahu DAS Keduag Perode Ulag Faktor K K.Sd Log R = Log X + K.Sd R (mm) -0,0588-0,007,774 59, ,856 0,0,88 76,6 0,044 0,6,94 87,406 5,8546 0,8,008 0,970 50, 0,7,05,088 00, ,4,095 4,406 Sumber: Perhtuga 4.5 Perhtuga Debt Bajr Recaa 4.5. Metode Haspers Perhtuga debt bajr recaa utuk metode megguaka persamaa-persamaa sebaga berkut : Q = α x β x q x A (.) α = + (0,0 A + (0,075 A 0,7 0,7 ) ) (.4) β = t + (, t + 5 0,40t ) A 0,75 (.5) t = 0, x L 0,8 x -0, (.6) q r = (.7), 6 t Dmaa: r utuk t < jam: t R 4 R = (.9) t + 0,0008(60 R4 )( t) Utuk jam < t < 9 jam: t R4 R = (.0) t + 9 jam < t < 0 har: R = 0,707 x t x R 4 + (.) Perhtuga: Perode ulag 50 tahu, R 4 =,088 m /dtk t = 0, x 4,85 0,8 x 0,08-0, = 7,47 jam Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 88 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

13 0,7 + (0,0 64,8 ) α = = 0, 085 0,7 + (0,075 64,8 ) β = β = 0,577 7,47+ (, , ,40x7,47 ) 64,8 0,75 =,7 Dar perhtuga ddapat t = 7,47 jam > jam, maka: 7,47,088 r = = 99,79 mm/jam 7,47+ 99,79 q = =,708 m /detk.km,6 7,47 Q 50 = α x β x q x A = 0,085 x 0,577 x,667 x 64, = 7,98 m /dtk Perhtuga debt bajr recaa dega metode haspers utuk perode ulag, 5, 0, 5, 50 da 00 tahu dsajka dalam Tabel 4.. Perode (tahu) R 4 (mm) Tabel 4. Perhtuga Debt Bajr Recaa dega Metode Haspers A (Km ) L (Km) t (jam) R (mm/jam) q (m/km.dtk) Koef. Red (β) Koef. Ruoff (α) Q (m /det) 59,409 64,8 4,85 0,08 7,47 5,96,948 0,577 0,08 6, ,6 64,8 4,85 0,08 7,47 67,40,496 0,577 0,08 6, ,406 64,8 4,85 0,08 7,47 77,088,866 0,577 0,08 85,8 5 0,970 64,8 4,85 0,08 7,47 89,9,44 0,577 0,08 6,796 50,088 64,8 4,85 0,08 7,47 99,79,708 0,577 0,08 40, ,406 64,8 4,85 0,08 7,47 09,70 4,079 0,577 0,08 64,497 Sumber: Perhtuga 4.5. Metode Weduwe Perhtuga debt bajr recaa utuk metode weduwe megguaka persamaa persamaa sebaga berkut : Q = α β q A (.) 4, α = (.) β + 7 q Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 89 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

14 t A β = t + 9 (.4) 0 + A R 67,65 q = (.5) 40 t +,45 0,5 0,5 t = 0,5 L Q (.6) Perhtuga : Perode ulag 50 tahu, R 4 =,088 m /dtk dcoba t = 5 jam t A β = t + 9 = 0, A q R 67,65 = 40 t +,45 = 4,94 m /detk.km α 4, = β + 7 = 0,58 Q q = β q A α = 597,94 m /dtk 0,5 0,5 t = 0,5 L Q = 4, jam dcoba t = 6 jam t A β = t + 9 = 0, A q R 67,65 = 40 t +,45 =,87 m /detk.km α 4. = β + 7 = 0,5 Q q = α β q A = 58, m /dtk 0,5 0,5 t = 0,5 L Q = 5,906 jam Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 90 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

15 dcoba t = 5,895 jam t A β = t A q = = 0,758 R 67,65 =,88 m /detk.km 40 t +,45 4, α = β + 7 q = 0,5 Q = α β q A = 59,74 m /dtk 0,5 0,5 t = 0,5 L Q = 5,895 jam... ok Ddapat t = 5,895 jam Maka Q 50 adalah sebesar 59,74 m /dtk Perhtuga debt bajr recaa dega metode weduwe utuk perode ulag, 5, 0, 5, 50 da 00 tahu dsajka dalam Tabel 4.4. Perode (tahu) Tabel 4.4 Perhtuga Debt Bajr Recaa dega Metode Weduwe R 4 (mm) A (Km ) L (Km) t (jam) β q (m/km.dtk α Q (m /det) 59,409 64,8 4,85 0,08 5,895 0,758 0,965 0,470 5, ,6 64,8 4,85 0,08 5,895 0,758,7 0,484 65, ,406 64,8 4,85 0,08 5,895 0,758,40 0,49 9,44 5 0,970 64,8 4,85 0,08 5,895 0,758,657 0,50 0,494 50,088 64,8 4,85 0,08 5,895 0,758,88 0,5 59, ,406 64,8 4,85 0,08 5,895 0,758,0 0,50 90,97 Sumber: Perhtuga 4.5. Metode Rasoal Perhtuga debt bajr recaa utuk metode rasoal megguaka persamaa-persamaa sebaga berkut : r f Q = α (.7),6 Itestas huja (r) dapat dhtug dega rumus Mooobe: Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 9 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

16 R r = (.44) t c Waktu kosetras (t c ) dhtug megguaka rumus yag dkembagka Krave: L t c = (.8) V p Kecepata rambat alra (W), dcar dega rumus Rzka: W 7 0,6 = (.45) Perhtuga: Perode ulag 50 tahu, R 4 =,088 m /dtk 0,6 W = 7 0,08 = 5,77 m/dtk 4,85 t c = = 8, jam 5,77,088 4 r = = 9,704 mm/jam 4 8, Koefse ru-off (α) Utuk meghtug la koefse ru-off (α) dapat dtetuka dega melhat jes pegguaa laha d DAS Keduag. Berdasarka Peta Rupa Bum DAS Keduag, pegguaa laha d DAS Keduag dataraya berupa; perumaha seluas 0 km, perkebua (77,87 km ), tegala/ladag (58,8 km ), sawah rgas (4,7 km ), sawah tadah huja (70,54 km ), semak (8,5 km ) dega tutupa huta seluas,5 km. Perhtuga la koefse ru-off (α) dsajka pada Tabel 4.5. Tabel 4.5 Nla Koefse Ruoff (α) utuk Persamaa Rasoal Tata gua laha Luas (km ) Luas (%) α Tabel α Perhtuga α x % Luas (%) Perumaha Kebu/perkebua Tegala/ladag Sawah rgas Sawah tadah huja Semak/belukar Huta 0,86 77,87 58,8 4,7 70,54 8,5,5 7,95,7 6,4,88 9,6, 0,97 0,0-0,50 0,0-0,5 0,0-0,5 0,0-0,5 0,0-0,5 0,50-0,70 0,05-0,5 0,4 0,75 0,75 0,75 0,75 0,6 0,5 0,8 0,074 0,08 0,008 0,09 0,040 0,004 Total 64,8 00 0,476 Sumber: Perhtuga Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 9 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

17 Q Dar perhtuga la koefse ru-off (α) pada Tabel 4., dtetuka la koefse ruoff (α) sebesar 0, = α r f,6 0,476 6,979 64,8 Q 50 = = 4,0 m /dtk,60 Perhtuga debt bajr recaa dega metode rasoal utuk perode ulag, 5, 0, 5, 50 da 00 tahu dsajka dalam Tabel 4.6. Perode (tahu) Tabel 4.6 Perhtuga Debt Bajr Recaa dega Metode Rasoal R 4 (mm) A (km ) L (km) W (m/dtk) t c (jam) r (mm/jam) α Qt (m /det) 59,409 64,8 4,85 0,08 5,77 8,0 5,098 0,476 7, ,6 64,8 4,85 0,08 5,77 8,0 6,5 0,476 6,7 0 87,406 64,8 4,85 0,08 5,77 8,0 7,50 0,476 87,97 5 0,970 64,8 4,85 0,08 5,77 8,0 8,750 0,476 9,9 50,088 64,8 4,85 0,08 5,77 8,0 9,704 0,476 4,0 00 4,406 64,8 4,85 0,08 5,77 8,0 0,675 0,476 67,54 Sumber: Perhtuga Metode Melchor Perhtuga debt bajr recaa utuk metode Melchor megguaka persamaa-persamaa sebaga berkut : Q = αxβxqxa (.46) A 970 = β 0, (.47) α = 0,5 (ketetua Melchor) R4 q = (.49),6xt 0, 0,4 t = 0,86 L Q (.48) Perhtuga: Dega cara coba-coba, Perode ulag 50 tahu, R 4 =,088 m /dtk dcoba t = 5 jam Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 9 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

18 970 A = β 0, A = 64,8 km, dar rumus datas maka ddapatka β = 0,8764 α = 0,5 (ketetua Melchor) R4 q = = 6,8 m /dtk.km,6xt Q = αxβxqxa = 04, m /dtk 0, 0,4 t = 0,86 L Q =,47 jam dcoba t = 4 jam β = 0,8764 α = 0,5 R4 q = =,44 m /dtk.km,6xt Q = αxβxqxa = 8,560 m /dtk 0, 0,4 t = 0,86 L Q =,876 jam dcoba t =,84 jam β = 0,8767 α = 0,5 R4 q = =,5 m /dtk.km,6xt Q = αxβxqxa = 86,094 m /dtk 0, 0,4 t = 0,86 L Q =,84 jam... OK Ddapat t =,84 jam Maka Q 50 adalah sebesar 86,094 m /dtk Perhtuga debt bajr recaa dega metode melchor utuk perode ulag, 5, 0, 5, 50 da 00 tahu dsajka dalam Tabel 4.7. Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 94 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

19 Perode (tahu) Tabel 4.7 Perhtuga Debt Bajr Recaa dega Metode Melchor R 4 (mm) A (km ) L (km) t (jam) β q (m /dtk.km ) α Q (m /det) 59,409 64,8 4,85 0,08,98 0,876,85 0,50 96, ,6 64,8 4,85 0,08,98 0,876,58 0,50 5, 0 87,406 64,8 4,85 0,08,98 0,876,74 0,50 89,48 5 0,970 64,8 4,85 0,08,98 0,876,04 0,50 7,74 50,088 64,8 4,85 0,08,98 0,876,5 0,50 86, ,406 64,8 4,85 0,08,98 0,876,5 0,50 48,64 Sumber: Perhtuga Debt Bajr Recaa Dar hasl perhtuga debt bajr recaa dega empat metode yag berbeda, maka dapat dketahu bahwa terjad perbedaa atara hasl perhtuga dar keempat metode tersebut. Pada perode ulag 50 tahu, perhtuga dega metode haspers meghaslka debt recaa terkecl dbadg dega ketga metode laya yatu sebesar 40,45 m /det, sedagka metode rasoal sebesar 4,0 m /det, metode weduwe sebesar 59,74 m /det, sedagka metode Melchor sebesar 86,094 m /det. Hasl perhtuga debt recaa utuk perode ulag, 5, 0, 5, 50 da 00 tahu dsajka dalam Tabel 4.6. Tabel 4.8 Hasl Perhtuga Debt Bajr Recaa Perode Ulag Metode perhtuga Q (m /det) (tahu) Haspers Weduwe Rasoal Melchor 6,09 5,05 7,76 96, ,850 65,67 6,7 5, 0 85,8 9,44 87,97 89,48 5 6,796 0,494 9,9 7, ,45 59,74 4,0 86, ,497 90,97 67,54 48,64 Sumber : Perhtuga Perode ulag T tahu utuk bagua check dam drecaaka dega perode ulag selama 50 tahu sesua dega Tabel.6, dmaa pekerjaa Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 95 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )

20 kostruks check dam merupaka proyek pegkata suga dega klasfkas wlayah desa berpeduduk kurag dar juta jwa. Peetua debt bajr yag dguaka utuk perecaaa detal kostruks adalah dega membadgka atara debt ar maksmum Suga Keduag tahu (Tabel 4.7) da debt bajr recaa hasl perhtuga (Tabel 4.6). Hal agar tdak terjad perkraa yag berlebh (over estmate) terhadap debt bajr recaa. Pada debt bajr recaa perode ulag 50 tahu, hasl perhtuga metode melchor sebesar 86,094 m /dtk (Tabel 4.6) hampr sama dega debt suga maksmum pada tahu 005 sebesar 80 m /dtk (Tabel 4.7). Maka debt bajr yag dguaka utuk perecaaaa check dam d DAS Keduag Desa Bragkal dambl dar perhtuga metode weduwe dega perode ulag 50 tahu yatu sebesar Q = 86,094 m /dtk. Tabel 4.9 Data Debt Ar d Beberapa Suga d Idoesa Tahu No Suga Lokas Q 004 (m /dtk) Q 005 (m /dtk) Maksmum Mmum Maksmum Mmum Ctarum Hulu Jabar Way Selampug Lampug Cmauk Jabar Clwug Jabar Bekas Jabar Serayu Jateg Keduag Jateg , 8 Jeeberag Sulsel Jambu P. Sumbawa 60,6 04,5 65,8 78,9 0 Duwu Kabah P. Sumbawa 758 0, 77 7,4 Parado P. Sumbawa Tu Kult P. Sumbawa 07 40, , Babak P. Lombok 577,5 76, ,95 4 Metg P. Lombok 40,9 70, , 5 Jagkok P. Lombok 66,49 6, ,8 6 Dodoka P. Lombok 88,88 4,5 44, 87 Sumber: KLH 005 Ths documet s Udp Isttutoal Repostory Collecto. The author(s) or copyrght ower(s) agree that UNDIP IR may, wthout chagg the cotet, traslate the submsso to ay medum or format for the purpose of preservato. The 96 author(s) or copyrght ower(s) also agree that UNDIP IR may keep more tha oe copy of ths submsso for purpose of securty, back up ad preservato: ( )