4.3.2 Hidrograf Satuan Snyder
Dalam permulaan tahun 1938, F.F.Snyder dari Amerika Serikat, telah mengembangkan rumus empiris dengan koefisien-koefisien empiris yang
menghubungkan unsure-unsur hidrograf satuan dengan karakteristik daerah pengaliran.
Adapun parameter-parameter yang dibutuhkan dalam analisis HSS Snyder adalah sebagai berikut tabel 4.23 :
Tabel 4.23 Parameter untuk menghitung HSS Snyder
Parameter Nilai
Satuan Keterangan
Luas DAS A 417,63
Km
2
Dari data BWS Panjang Sungai Utama L
77 Km
Dari data BWS Jarak antara titik berat DAS dan
outlet Lc 45,455
Km Dari Peta DAS
Belawan Koefisien Ct
2,26 -
Perhitungan Koefisien Cp
0,2006 -
Perhitungan T
R
asumsi 1
Jam Asumsi
Curah Hujan h 0,187
m Dari Distribusi Gumbel
sumber :Hasil Perhitungan dan analisa data Dari parameter diatas nilai Ct dan Cp harus diperoleh melalui perhitungan
terlebih dahulu. Adapun parameter tambahan yang diperlukan adalah nilai t pR
=
24 jam Suripin,2003 dan debit puncak sebesar 15,933 3
m det yang diperoleh
dari BWS untuk DAS BELAWAN.
Karena tpR jauh dari 5,5 tR, maka kelambatan DAS standar adalah:
R
t R = 5,5 t p
t R = 5,5 1 = 5,5 p
t t r- R
t = t R + p
p 4
t 1 r-
t = 24 + p
4
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dikombinasikan ke pers 2.28
Dapat diperoleh nilai tr dan tp sebagai berikut :
Menghitung nilai Ct dan Cp dengan rumus sebagai berikut :
Koefisien Cp dihitung dengan rumus sebagai berikut :
Dari parameter diatas selanjutkan kita akan mencari hidrograf satuan dengan beberapa factor-faktor, antara lain :
t 4
r x t = 24 +
p 4
t 4
r - 5,5 t = 24 +
r 4
5,5 4 t = 24 4 + t 1
r r
22 1 t = 96 1
r
t = 4,5238
r jam
t = 5,5 t p
r t = 24,88
p jam
0,3 t = C L.L
p c
t 0,3
24,88 = C 77x45, 455 t
C = 2, 26 t
241,8688 3
q =
0.571m det.cm pR
417, 63
2, 75.Cp q
= pR
t pR
2, 75.Cp 0,571 =
24 C = 0, 2006
p t = 5,5 t
p r
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1. Mencari waktu mulai titik berat hujan sampai debit puncak tp
2.Mencari waktu mencapai puncak banjir Tp
3. Mencari lama curah hujan efektif tr’
karena tr’tr maka digunakan persamaan 2.33 antar lain :
4. Mencari debit puncak Qp
5. Memasukkan hasil perhitungan ke tabel Ordinat hidrograf satuan dihitung dengan persamaan Alexeyev
t = 24,88 jam p
t 1
r T = t +
= 24,88 + = 25,38 jam
p p
2 2
t 24,88
p t =
= = 4,523
r 5,5
5,5
t 1
r T = t +
= 10,994 + = 11, 494 jam
p p
2 2
3 Qp = qp.A = 0, 0246 x 417, 63 = 10,326 m det mm
C 1
p qp = 0, 278.
= 0, 278 = 0, 0247
t 10,994
p
λ = Qp.T h.A = 10,326 x 11,743 0,187 x 417,63 =1,543 p
2 2
a = 1,32. λ +0,15λ +0,045 =1,321,543 +0,151,543 +0,045 = 3,4303
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Setelah itu hasilnya ditabelkan dengan keterangan sebagai berikut tabel 4.24 : Kolom 1 : Periode hidrograf dengan selang waktu 1 jam
Kolom 2 : X=tTp Kolom 3 :
2
.1
10
a x
x
Y
Kolom4: Q=Y.Qp karenaY= QQp
Tabel 4.24 Tabel hasil perhitungan HSS Snyder
t x
y
Q
Akibat hujan mm
65,127 mm 41,028 mm
31,31 mm
Total 1
0.038079413 6.60859E-06 5.9866E-06
0.000389889 0.038481897
2 0.076158826 0.004083676 0.003699326 0.240925993 0.000245618
0.325113438 3
0.114238239 0.034352134 0.03111896 2.026684524 0.15177594
0.00018744 2.358357237
4 0.152317652 0.098706605 0.08941648
5.823427119 1.276748701 0.115825891 7.556442449 5
0.190397064 0.184558779 0.16718837 10.88847699 3.668579358 0.974334645 16.07353521
6 0.228476477 0.278369212
0.2521695 16.42304302 6.859404455 2.799630001 26.84109267
7 0.26655589
0.371357556 0.336405914 21.90910793 10.34601024 5.234667872 38.46410541 8
0.304635303 0.458818781 0.415635413 27.06908752 13.80206182 7.895427043 49.94566587 9
0.342714716 0.538611158 0.487917845 31.77662549 17.05268971 10.53286915 60.73142807 10
0.380794129 0.610041207 0.552625
35.99080841 20.01829335 13.01354477 70.56610686 11
0.418873542 0.673183813 0.609824714 39.71605417 22.67309852 15.27670773 79.36774248 12
0.456952955 0.728494299 0.659929456 42.97922569 25.01988838 17.30268876 87.14717955 13
0.495032368 0.776594006 0.703502088 45.81698051 27.07558573 19.0936118 93.9613065
14 0.53311178
0.818154697 0.741151146 48.26895072 28.86328368 20.66239127 99.8870433 15
0.571191193 0.853838307 0.773476266 50.37418874 30.40794924 22.02665039 105.0072941 16
0.609270606 0.884267428 0.801041441 52.16942592 31.73418422 23.2054424 109.403632
17 0.647350019 0.910012681 0.824363588 53.68832736 32.86512824 24.21754187 113.1527238
18 0.685429432 0.931589203 0.843909359 54.96128479 33.82198927 25.08060752 116.3248096
19 0.723508845 0.949457897 0.860096277 56.01549021 34.62391316 25.81082392 118.9832903
20 0.761588258
0.964029 0.873295968 56.8751465
35.28803004 26.42280202 121.1848918 21
0.799667671 0.975666623 0.883838275 57.56173531 35.82958697 26.92961442 122.9801093 22
0.837747083 0.984693529 0.892015581 58.09429873 36.26211673 27.34289675 124.4137684 23
0.875826496 0.991395754 0.898087003 58.48971222 36.59761525 27.67297638 125.5256131 24
0.913905909 0.996026903 0.902282274 58.76293768 36.84671354 27.92900784 126.3508741 25
0.951985322 0.998812024 0.904805263 58.92725238 37.01883715 28.11910405 126.9207962 26
0.990064735 0.999951064 0.905837098 58.9944527 37.12235034 28.25045801 127.2631139
27 1.028144148 0.999621916 0.90553893
58.97503388 37.16468447 28.32945279 127.4024761
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28 1.066223561 0.99798309
0.904054347 58.87834749 37.15245121 28.36175955 127.3608192 29
1.104302974 0.99517604 0.901511494 58.71273905 37.09154177 28.35242389 127.1576952
30 1.142382387 0.991327205 0.898024905 58.48566802 36.98721356 28.30594162 126.8105577
31 1.180461799 0.986549774 0.893697119 58.20381227 36.84416582 28.22632487 126.3350116
32 1.218541212 0.980945231 0.888620068 57.87315915 36.6666054
28.11715979 125.7450308 33
1.256620625 0.974604703 0.882876301 57.49908486 36.45830414 27.98165679 125.0531474 34
1.294700038 0.967610132 0.876540049 57.08642376 36.22264888 27.82269432 124.2706172 35
1.332779451 0.9600353
0.86967815 56.63952887 35.96268513 27.64285699 123.4075639
36 1.370858864 0.951946732 0.862350866 56.16232485 35.68115513 27.44446893 122.4731054
37 1.408938277 0.943404477 0.854612596 55.65835451 35.38053133 27.22962287 121.4754641
38 1.44701769
0.934462803 0.846512499 55.13081954 35.06304557 27.00020562 120.4220637 39
1.485097103 0.925170806 0.838095052 54.58261645 34.73071482 26.75792037 119.3196146 40
1.523176515 0.915572946 0.829400528 54.01636821 34.38536379 26.50430635 118.1741883 41
1.561255928 0.905709518 0.820465432 53.43445221 34.02864488 26.24075608 116.991284 42
1.599335341 0.895617075 0.811322876 52.83902495 33.66205576 25.96853054 115.7758865 43
1.637414754 0.885328799 0.802002918 52.23204404 33.28695496 25.68877269 114.5325182 44
1.675494167 0.874874829 0.79253286 51.6152876
32.90457572 25.40251925 113.2652844 45
1.71357358 0.864282556 0.782937517 50.99037167 32.5160382
25.11071136 111.9779149 46
1.751652993 0.853576886 0.773239449 50.35876559 32.12236045 24.81420386 110.6737992 47
1.789732406 0.842780471 0.763459177 49.72180584 31.72446811 24.51377366 109.3560197 48
1.827811818 0.831913922 0.753615373 49.08070837 31.32320313 24.21012715 108.0273797 49
1.865891231 0.820995994 0.743725024 48.43657965 30.9193315 23.90390684 106.6904302
50 1.903970644 0.810043754 0.733803593 47.79042661 30.51355029 23.59569731 105.3474922
51 1.942050057 0.799072733 0.723865149 47.14316557 30.10649382 23.28603051 104.0006778
52 1.98012947
0.788097063 0.713922493 46.49563023 29.69873934 22.9753905 102.6519091
53 2.018208883 0.777129598 0.70398727
45.84857896 29.29081206 22.66421782 101.3029346 54
2.056288296 0.766182025 0.694070068 45.20270131 28.88318973 22.35291327 99.9553447 55
2.094367709 0.755264967 0.684180508 44.55862395 28.47630675 22.04184144 98.61058531 56
2.132447122 0.744388071 0.674327329 43.91691598 28.07055788 21.73133383 97.26997021 57
2.170526534 0.733560089 0.664518461 43.27809384 27.66630167 21.42169171 95.93469229 58
2.208605947 0.722788956 0.654761093 42.64262568 27.26386343 21.11318868 94.60583379 59
2.24668536 0.712081858 0.645061731 42.01093537 26.86353811 20.80607303 93.28437546
60 2.284764773 0.701445291 0.635426262 41.38340618 26.46559271 20.50056981 91.97120503
61 2.322844186 0.690885117 0.625859997 40.76038405 26.07026869 20.19688281 90.66712484
62 2.360923599 0.680406621 0.616367722 40.14218063 25.67778397 19.89519627 89.37285882
63 2.399003012 0.67001455
0.606953738 39.52907611 25.2883349 19.59567652 88.08905883
64 2.437082425 0.659713163 0.597621903 38.92132165 24.90209797 19.29847338 86.81631049
65 2.475161838 0.649506264 0.588375663 38.31914178 24.51923142 19.00372154 85.55513851
66 2.51324125
0.639397243 0.579218089 37.72273645 24.13987668 18.71154177 84.30601149 67
2.551320663 0.629389107 0.570151904 37.13228304 23.76415974 18.422042
83.06934645 68
2.589400076 0.619484509 0.561179512 36.54793809 23.39219231 18.13531835 81.84551285 69
2.627479489 0.609685777 0.552303023 35.96983896 23.02407303 17.85145611 80.63483638 70
2.665558902 0.599994939 0.543524273 35.39810532 22.65988841 17.57053053 79.43760238
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71 2.703638315 0.590413749 0.53484485
34.83284057 22.29971387 17.29260764 78.25405899 72
2.741717728 0.580943703 0.526266112 34.27413307 21.94361452 17.01774498 77.08442012 73
2.779797141 0.571586065 0.517789202 33.72205734 21.59164604 16.74599227 75.92886805 74
2.817876553 0.562341882 0.509415068 33.17667514 21.24385537 16.47739196 74.78755597 75
2.855955966 0.553212002 0.501144478 32.63803645 20.90028141 16.21197991 73.66061021 76
2.894035379 0.544197086 0.492978034 32.10618043 20.56095566 15.94978578 72.54813238 77
2.932114792 0.535297631 0.484916183 31.58113624 20.22590279 15.69083362 71.45020126 78
2.970194205 0.526513974 0.476959231 31.06292383 19.89514115 15.43514225 70.36687464 79
3.008273618 0.517846309 0.469107355 30.55155468 19.56868333 15.18272569 69.29819097 80
3.046353031 0.5092947
0.46136061 30.04703247 19.24653654 14.93359352 68.24417087
81 3.084432444 0.500859086 0.453718944 29.54935369 18.92870312 14.68775127 67.20481855
82 3.122511857 0.492539296 0.446182202 29.05850824 18.61518085 14.44520071 66.18012315
83 3.160591269 0.484335057 0.438750134 28.57447996 18.30596336 14.20594015 65.17005993
84 3.198670682
0.476246 0.431422407 28.09724711 18.00104049 13.96996473 64.17459142
85 3.236750095 0.46827167
0.42419861 27.62678285 17.70039852 13.73726669 63.19366843
86 3.274829508 0.460411533 0.417078257 27.16305565 17.40402056 13.50783557 62.22723107
87 3.312908921 0.452664981
0.4100608 26.70602971 17.11188673 13.28165847 61.27520961
88 3.350988334 0.445031341 0.403145628 26.25566529 16.82397449 13.05872023 60.33752531
89 3.389067747 0.43750988
0.396332076 25.81191909 16.54025881 12.83900364 59.41409125 90
3.42714716 0.430099809 0.389619429 25.37474457 16.2607124
12.6224896 58.50481297
91 3.465226573 0.422800287 0.383006928 24.94409219 15.98530594 12.40915729 57.60958921
92 3.503305985 0.41561043
0.37649377 24.51990975 15.71400824 12.19898433 56.7283125
93 3.541385398 0.408529311 0.370079116 24.1021426
15.44678639 11.99194691 55.86086973 94
3.579464811 0.401555968 0.363762094 23.69073392 15.18360598 11.78801993 55.0071427 95
3.617544224 0.394689404 0.357541801 23.28562487 14.9244312 11.58717713 54.16700863
96 3.655623637 0.38792859
0.351417306 22.88675488 14.66922501 11.38939117 53.34034059 97
3.69370305 0.381272475 0.345387655 22.49406178 14.41794923 11.19463379 52.52700797
98 3.731782463 0.37471998
0.339451871 22.107482
14.17056469 11.00287585 51.72687685 99
3.769861876 0.368270007 0.33360896 21.72695073 13.92703136 10.81408746 50.9398104
100 3.807941288 0.361921438 0.32785791 21.35240207 13.68730841 10.62823808 50.16566919
101 3.846020701 0.355673141 0.322197694 20.9837692 13.45135431 10.44529653 49.40431158
102 3.884100114 0.34952397 0.316627274 20.62098444 13.21912698 10.26523115 48.65559393
103 3.922179527 0.343472766 0.3111456
20.26397948 12.99058378 10.08800979 47.91937094 104 3.96025894
0.33751836 0.305751615 19.9126854
12.76568167 9.913599935 47.19549592 105 3.998338353 0.331659578 0.300444252 19.56703282 12.54437724 9.741968732 46.48382097
106 4.036417766 0.325895236 0.295222442 19.22695198 12.32662678 9.573083051 45.78419726 107 4.074497179 0.320224148 0.290085109 18.89237288 12.11238635 9.406909538 45.0964752
108 4.112576592 0.314645124 0.285031174 18.56322529 11.90161184 9.243414661 44.42050468 109 4.150656004 0.309156971 0.280059559 18.23943887 11.69425902 9.082564756 43.75613518
110 4.188735417 0.303758497 0.275169181 17.92094327 11.49028357 8.924326066
43.103216 111 4.22681483
0.29844851 0.270358962 17.60766814 11.28964117 8.76866478
42.46159639 112 4.264894243 0.293225818 0.265627823 17.29954322 11.0922875
8.615547067 41.83112567 113 4.302973656 0.288089234 0.260974687 16.99649841 10.89817831 8.464939109 41.21165341
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114 4.341053069 0.283037572 0.25639848 16.69846381 10.70726944 8.316807133 40.60302951
115 4.379132482 0.278069652 0.251898134 16.40536978 10.51951684 8.171117436 40.00510432 116 4.417211895 0.273184299 0.247472584 16.11714695 10.33487664 8.027836412 39.41772878
117 4.455291308 0.268380343 0.243120769 15.83372632 10.15330516 7.886930578 38.84075447 118 4.49337072
0.263656621 0.238841636 15.55503924 9.974758907 7.748366591 38.27403372 119 4.531450133 0.259011975 0.234634138 15.28101751 9.799194653 7.612111275 37.71741969
120 4.569529546 0.254445258 0.230497234 15.01159335 9.626569419 7.478131631 37.17076644 121 4.607608959 0.249955329 0.22642989
14.74669946 9.456840512 7.346394865 36.63392902 122 4.645688372 0.245541055 0.222431082 14.48626905 9.289965537 7.216868393 36.10676349
123 4.683767785 0.241201314 0.218499791 14.23023586 9.125902417 7.089519864 35.58912703 124 4.721847198 0.236934991 0.214635008 13.97853418 8.964609409 6.964317166 35.08087795
125 4.759926611 0.232740983 0.210835734 13.73109888 8.806045119 6.841228444 34.58187577 126 4.798006023 0.228618196 0.207100978 13.4878654
8.650168512 6.720222109 34.09198122 127 4.836085436 0.224565546 0.203429757 13.24876981 8.496938928 6.601266845 33.61105633
128 4.874164849 0.220581959 0.1998211
13.01374881 8.346316089 6.484331623 33.13896443 129 4.912244262 0.216666374 0.196274045 12.78273972 8.198260111 6.369385706 32.67557022
130 4.950323675 0.21281774 0.192787638 12.55568051 8.052731511 6.256398657 32.22073973
131 4.988403088 0.209035015 0.189360938 12.33250981 7.909691216 6.145340344 31.77434042 132 5.026482501 0.205317172 0.185993013 12.11316695 7.769100568 6.036180949 31.33624115
133 5.064561914 0.201663192 0.182682941 11.89759189 7.630921331 5.928890972 30.90631224 134 5.102641327 0.198072071 0.179429811 11.6857253
7.495115697 5.823441232 30.48442544 135 5.140720739 0.194542815 0.176232723 11.47750856 7.361646288 5.719802878
30.070454 136 5.178800152 0.19107444
0.173090787 11.27288369 7.230476162 5.617947384 29.66427262 137 5.216879565 0.187665978 0.170003124 11.07179348 7.101568815 5.517846559 29.26575752
138 5.254958978 0.184316469 0.166968866 10.87418135 6.974888183 5.419472546 28.8747864 139 5.293038391 0.181024967 0.163987156 10.67999149 6.850398645 5.322797821 28.49123847
140 5.331117804 0.177790537 0.161057146 10.48916875 6.728065024 5.227795203 28.11499447 141 5.369197217 0.174612258 0.158178002 10.30165871 6.607852588 5.134437845 27.74593662
142 5.40727663
0.171489218 0.155348898 10.11740765 6.489727049 5.042699243 27.38394869 143 5.445356043 0.168420518 0.15256902
9.936362553 6.373654567 4.95255323 27.02891593
144 5.483435455 0.165405273 0.149837565 9.758471117 6.259601745 4.863973981 26.68072514 145 5.521514868 0.162442608 0.147153742 9.583681737 6.14753563
4.77693601 26.3392646
146 5.559594281 0.159531659 0.144516767 9.411943511 6.037423715 4.69141417 26.0044241
147 5.597673694 0.156671576 0.141925872 9.243206238 5.929233933 4.607383653 25.67609497 148 5.635753107 0.15386152
0.139380294 9.07742041 5.822934659 4.524819988 25.35416998
149 5.67383252 0.151100664 0.136879285 8.914537215 5.718494704 4.443699039 25.03854343
150 5.711911933 0.148388191 0.134422106 8.754508528 5.615883318 4.363997006 24.72911108 151 5.749991346 0.145723298 0.132008029 8.597286911 5.515070184 4.285690423 24.42577019
152 5.788070758 0.143105191 0.129636335 8.442825604 5.416025418 4.208756154 24.12841946 153 5.826150171 0.140533091 0.127306317 8.291078526 5.318719562 4.133171391 23.83695906
154 5.864229584 0.138006227 0.125017278 8.142000263 5.223123585 4.058913656 23.55129059 155 5.902308997 0.13552384
0.12276853 7.995546071 5.129208881 3.985960794 23.27131711
156 5.94038841 0.133085185 0.120559397 7.851671863 5.03694726
3.914290974 22.99694309
Universitas Sumatera Utara
157 5.978467823 0.130689523 0.118389212 7.710334209 4.946310949 3.843882683 22.7280744 158 6.016547236 0.128336131 0.116257318 7.571490328 4.85727259
3.774714727 22.46461833 159 6.054626649 0.126024294 0.114163067 7.43509808
4.769805229 3.706766227 22.20648355 160 6.092706062 0.123753308 0.112105823 7.301115964 4.683882323 3.640016616 21.9535801
161 6.130785474 0.121522481 0.110084959 7.169503108 4.599477724 3.574445635 21.70581938 162 6.168864887 0.119331131 0.108099855 7.040219266 4.516565687 3.510033332 21.46311416
163
6.2069443 0.117178585 0.106149904 6.913224809 4.435120857 3.446760058 21.22537851
164 6.245023713 0.115064183 0.104234507 6.788480719 4.355118268 3.384606465 20.99252786 165 6.283103126 0.112987274 0.102353073 6.665948584 4.276533342
3.3235535 20.7644789
166 6.321182539 0.110947216 0.100505022 6.545590588 4.199341878 3.263582406 20.54114965 167 6.359261952 0.108943378 0.098689783 6.427369508 4.123520056 3.204674715 20.32245939
168 6.397341365 0.10697514 0.096906793 6.311248704 4.049044424 3.146812249 20.10832867
169 6.435420778 0.105041891 0.095155498 6.197192115 3.975891901 3.089977111 19.89867929 170 6.47350019
0.103143028 0.093435353 6.085164248 3.90403977 3.034151687 19.69343428
171 6.511579603 0.101277959 0.091745822 5.975130177 3.833465671 2.979318641 19.49251787 172 6.549659016 0.099446103 0.090086378 5.867055529 3.764147602 2.925460909 19.29585554
173 6.587738429 0.097646885 0.0884565
5.760906483 3.696063909 2.8725617
19.10337391 174 6.625817842 0.095879743 0.086855678 5.656649762 3.629193287 2.82060449
18.9150008 175 6.663897255 0.09414412
0.08528341 5.554252621 3.56351477
2.769573019 18.73066519 176 6.701976668 0.09243947
0.0837392 5.453682847 3.499007732 2.719451288 18.5502972
177 6.740056081 0.090765258 0.082222561 5.354908747 3.435651878 2.670223557 18.37382808 178 6.778135493 0.089120953 0.080733016 5.257899144 3.373427243 2.621874337 18.20119019
179 6.816214906 0.087506036 0.079270093 5.162623369 3.312314188 2.574388393 18.03231699 180 6.854294319 0.085919997 0.07783333
5.069051252 3.252293389 2.527750736 17.86714302 181 6.892373732 0.084362331 0.076422269 4.977153119 3.193345844 2.481946622 17.70560392
182 6.930453145 0.082832545 0.075036464 4.886899785 3.135452856 2.436961547 17.54763634 183 6.968532558 0.081330151 0.073675473 4.798262542 3.078596041 2.392781245 17.39317801
184 7.006611971 0.079854671 0.072338863 4.711213158 3.022757314 2.349391685 17.24216766 185 7.044691384 0.078405635 0.071026208 4.625723867 2.967918888 2.306779065 17.09454505
186 7.082770797 0.076982579 0.069737089 4.541767365 2.914063274 2.264929813 16.95025092 187 7.120850209 0.075585049 0.068471092
4.4593168 2.861173268 2.223830581
16.809227 188 7.158929622 0.074212596 0.067227813 4.378345769 2.809231957 2.183468242
16.671416 189 7.197009035 0.072864782 0.066006853 4.298828308 2.758222706 2.143829886 16.53676157
190 7.235088448 0.071541173 0.06480782 4.220738888 2.70812916
2.104902821 16.40520831 191 7.273167861 0.070241343 0.063630329 4.144052407 2.658935235 2.066674564 16.27670174
192 7.311247274 0.068964875 0.062474
4.068744187 2.61062512 2.029132842 16.1511883
193 7.349326687 0.067711357 0.061338461 3.994789962 2.563183265 1.992265587 16.02861532 194
7.3874061 0.066480385 0.060223346 3.922165878 2.516594386 1.956060935 15.90893103
195 7.425485513 0.065271561 0.059128295 3.850848479 2.470843454 1.92050722 15.79208452
196 7.463564925 0.064084495 0.058052954 3.780814712 2.425915694 1.885592974 15.67802575 197 7.501644338 0.062918801 0.056996974 3.712041909 2.381796582 1.851306922 15.56670553
198 7.539723751 0.061774104 0.055960013 3.64450779 2.338471839 1.817637979 15.45807548
199 7.577803164 0.06065003 0.054941736 3.578190452 2.295927428 1.784575248 15.35208806
Universitas Sumatera Utara
Sumber: hasil perhitungan
200 7.615882577 0.059546216 0.053941812 3.513068366 2.254149552 1.752108018 15.24869654 201 7.65396199
0.058462303 0.052959915 3.449120369 2.213124648 1.72022576 15.14785498
202 7.692041403 0.057397938 0.051995726 3.386325659 2.172839383 1.688918122 15.04951823 203 7.730120816 0.056352775 0.051048932 3.324663791 2.133280654 1.658174931 14.9536419
204 7.768200228 0.055326472 0.050119224 3.264114669 2.09443558 1.627986187 14.86018236
205 7.806279641 0.054318696 0.049206298 3.204658543 2.056291502 1.598342059 14.76909674 206 7.844359054 0.053329116 0.048309856
3.146276 2.018835977 1.569232888 14.68034289
207 7.882438467 0.052357411 0.047429606 3.088947961 1.982056777 1.540649177 14.5938794
Universitas Sumatera Utara
Gambar 4.5 Grafik Hidrograf Sintetik Synder
50 100
150 200
250 300
1 12
23 34
45 56
67 78
89 100
111 122
133 144
155 166
177 188
199
D ebi
t m
3 det
WaktuJam
Hidrograf Satuan Sintetik Snyder Sungai Belawan
Total Akibat hujan 31,31 mm
Akibat hujan 41,028 mm Akibat hujan 65,127 mm
Universitas Sumatera Utara
4.2.3 Hidrograf Satuan Gamma-1
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