マニング公式による流速流量表

Ｕ字溝（上ぶた式Ｕ形側溝）
１．粗度係数 n=0.013
２．粗度係数 n=0.014
３．計算書詳細※粗度係数は、参照する基準によって異なりますので必ず確認してください。

MATSUSAKA
KOSAN

松阪興産株式会社

Ｕ字溝（上ぶた式Ｕ形側溝）

マニング（ｍａｎｎｉｎｇ）公式による流速・流量表

V = 1/n × Ｒ2/3 × I1/2
Q=A×V
ここで，

V ： 流速 （m/sec)n ： 粗度係数0.013

R ： 径深 （m) = Ａ/ＰA ： 通水断面積 （m2)
P ： 潤辺 （m）
I ： 水路勾配 （‰) ※1‰（パーミル）＝0.1％
Ｑ ： 流量 （m3/sec)※8割水深(0.8H)で計算
1‰(=パーミル）

幅Ｂ

1mm

深さＨ
潤辺Ｐ
通水断面積Ａ

1000mm№1
呼び名
幅Ｂ×深さＨ（mm）
2
通水断面積 Ａ（m )潤辺 Ｐ（m)
径深 Ｒ（m)2/3
Ｒ
粗度係数 n1/2
勾配Ｉ（‰）
Ｉ
100.0
75.0
50.0
40.0
35.0
30.0
25.0
20.0
18.0
16.0
14.0
12.0
10.0
9.0
8.0
7.0
6.0
5.5
5.0
4.8
4.6
4.5
4.4
4.2
4.0
3.8
3.5
3.4
3.0
2.8
2.6
2.5
2.4
2.2
2.0
1.8
1.6
1.5
1.4
1.2
1.0
0.8
0.6

0.31620.27390.22360.20000.18710.17320.15810.14140.13420.12650.11830.10950.10000.09490.08940.08370.07750.07420.07070.06930.06780.0671
0.06630.06480.0632
0.0616
0.05920.05830.05480.05290.05100.05000.04900.04690.04470.04240.04000.03870.03740.0346
0.03160.02830.0245150
150×150
0.01690.35620.04740.13100.0130V
Ｑ
3.18592.75912.25282.01491.88481.74501.59291.42481.35161.2743
1.19201.1036
1.00740.95570.90110.84290.78040.74710.71240.69800.68330.67580.66820.65290.63710.62100.59600.58740.55180.53310.51370.50370.49350.47250.45050.42740.40290.39020.37690.34900.31850.28490.2467

0.05380.0466
0.03800.03400.03180.02940.02690.02400.02280.02150.02010.01860.01700.01610.01520.01420.01310.01260.01200.01170.01150.01140.01120.01100.01070.01040.01000.00990.00930.00900.00860.00850.00830.00790.00760.00720.00680.00650.00630.00580.00530.00480.0041

180
180×1800.02410.41790.05770.14930.0130V
Ｑ
3.6322
3.14562.56832.29722.14881.9894
1.81611.6243
1.54101.45281.35901.2582
1.14861.0896
1.02730.96090.88970.85180.81210.79570.77900.77050.76190.74430.72640.70800.67950.66970.62910.60770.58560.57430.56270.53870.5136
0.48730.45940.44480.42970.39780.36320.32480.28130.08750.07580.06180.05530.05170.04790.04370.03910.03710.03500.03270.03030.0276
0.02620.02470.0231
0.02140.02050.01950.01910.01870.01850.01830.01790.01750.01700.01630.01610.01510.01460.01410.01380.01350.01290.01230.01170.01100.01070.01030.00950.00870.00780.0067240
240×2400.04280.56540.07570.17890.0130V
Ｑ
4.35293.76973.07802.75302.57522.38422.1764
1.94671.84681.74111.62871.50791.37651.30581.2312
1.1516
1.0662
1.02080.97330.9536
0.9336
0.92340.91300.89200.87050.84850.81430.80260.75390.72830.70180.6882
0.67430.6456
0.6156
0.58400.5506
0.53310.51500.47680.43520.38930.33710.18630.16130.13170.11780.11020.10200.09310.08330.07900.07450.06970.06450.05890.05580.05260.04920.0456
0.0436
0.04160.04080.03990.03950.03900.03810.03720.03630.03480.03430.03220.03110.03000.02940.02880.0276
0.02630.02490.02350.02280.02200.02040.01860.01660.0144300Ａ
300×2400.05220.61020.08550.19410.0130V
Ｑ
4.72104.0885
3.33822.98582.79292.58572.36052.11122.00291.8884
1.7664
1.6354
1.49291.4163
1.3353
1.24901.1564
1.10711.05561.03431.01251.00140.99020.96750.94420.92020.88320.87050.81770.78990.76120.74640.73130.70020.6676
0.63330.5971
0.5782
0.55850.51710.4721
0.42220.36560.24640.21340.17420.15580.14570.13490.12320.11020.10450.09850.09220.08530.07790.07390.06970.06510.06030.05770.0551
0.05390.05280.05220.05160.05050.04920.04800.04610.04540.0426
0.04120.03970.03890.03810.03650.03480.03300.03110.03010.02910.02690.02460.02200.0190

№2
呼び名
幅Ｂ×深さＨ(mm)2
通水断面積 Ａ（m )潤辺 Ｐ（m)
径深 Ｒ（m)2/3
Ｒ
粗度係数 n1/2
勾配Ｉ（‰）
Ｉ
100.0
75.0
50.0
40.0
35.0
30.0
25.0
20.0
18.0
16.0
14.0
12.0
10.0
9.0
8.0
7.0
6.0
5.5
5.0
4.8
4.6
4.5
4.4
4.2
4.0
3.8
3.5
3.4
3.0
2.8
2.6
2.5
2.4
2.2
2.0
1.8
1.6
1.5
1.4
1.2
1.0
0.8
0.6

0.31620.27390.22360.20000.18710.17320.15810.14140.13420.12650.11830.10950.10000.09490.08940.08370.07750.07420.07070.06930.06780.0671
0.06630.06480.0632
0.0616
0.05920.05830.05480.05290.05100.05000.04900.04690.04470.04240.04000.03870.03740.0346
0.03160.02830.0245300Ｂ
300×300
0.06520.70440.09260.20470.0130V
Ｑ
4.97884.31183.52053.14892.94552.72702.48942.2266
2.1123
1.99151.86291.72471.5744
1.4936
1.4082
1.3172
1.21951.1676
1.1133
1.09081.06781.0561
1.04431.02030.99570.97050.93140.91800.86230.83310.80280.78720.77130.73840.70410.66790.62970.60970.58910.54540.49780.44530.38560.3246
0.28110.22950.20530.19200.17780.16230.14510.13770.12980.12140.11240.1026
0.09730.09180.08580.07950.07610.07250.0711
0.0696
0.06880.06800.06650.06490.06320.06070.05980.05620.05430.05230.05130.05020.04810.04590.04350.04100.03970.03840.03550.03240.02900.0251

300Ｃ
300×360
0.07850.7992
0.09820.21290.0130V
Ｑ
5.17764.48393.66113.2746
3.0631
2.83592.58882.31552.19662.07101.9372
1.7935
1.6373
1.5532
1.4644
1.36981.2682
1.2142
1.15771.13431.1104
1.09831.08601.06101.03551.00930.9686
0.95470.89670.86630.83480.81860.80210.76790.7322
0.69460.65490.63410.6126
0.56710.51770.46310.40100.40640.35190.28730.25700.24040.22260.20320.18170.17240.16250.15200.14070.12850.12190.11490.10750.09950.09530.09080.08900.08710.08620.08520.08320.08120.07920.07600.07490.07030.06800.06550.06420.06290.06020.05740.05450.05140.04970.04800.04450.0406
0.03630.0314360Ａ
360×300
0.07840.75640.10360.22060.0130V
Ｑ
5.36574.64683.7941
3.3935
3.17442.93892.68282.39962.27642.14622.0076
1.8587
1.69671.60971.5176
1.41961.3143
1.2583
1.19981.17551.15081.13821.12551.0996
1.0731
1.04591.00380.98930.92930.89780.86510.84830.83120.79580.75880.71980.67870.65710.63480.58770.53650.47990.41560.4206
0.36430.2974
0.26600.24880.23040.21030.18810.17840.16820.15730.14570.13300.12620.11890.11120.10300.0986
0.09400.09210.09020.08920.08820.08620.08410.08190.07860.07750.07280.07030.06780.06650.0651
0.06230.05940.05640.05320.05150.04970.04600.04200.03760.0325360Ｂ
360×360
0.09400.85090.11050.23030.0130V
Ｑ
5.60144.85093.96083.5426
3.31383.06802.80072.50502.37642.24052.09581.94031.77131.6804
1.5843
1.48191.37201.3136
1.25251.22721.2013
1.1882
1.17491.14791.1202
1.09191.04791.03280.97010.93720.90320.88560.86770.83080.79210.75150.70850.68600.66270.61360.56010.50100.43380.52650.45590.37230.33300.31140.28830.26320.23540.22330.2106
0.19700.18230.16650.15790.14890.13920.12890.12340.11770.11530.11290.11160.11040.10790.10520.1026
0.09850.09700.09110.08800.08490.08320.08150.07800.07440.0706
0.06650.06440.06220.0576
0.05260.04700.0407

№3
呼び名
幅Ｂ×深さＨ(mm)2
通水断面積 Ａ（m )潤辺 Ｐ（m)
径深 Ｒ（m)2/3
Ｒ
粗度係数 n
勾配Ｉ（‰）
Ｉ1/2
100.0
75.0
50.0
40.0
35.0
30.0
25.0
20.0
18.0
16.0
14.0
12.0
10.0
9.0
8.0
7.0
6.0
5.5
5.0
4.8
4.6
4.5
4.4
4.2
4.0
3.8
3.5
3.4
3.0
2.8
2.6
2.5
2.4
2.2
2.0
1.8
1.6
1.5
1.4
1.2
1.0
0.8
0.6

0.31620.27390.22360.20000.18710.17320.15810.14140.13420.12650.11830.10950.10000.09490.08940.08370.07750.07420.07070.06930.06780.0671
0.06630.06480.0632
0.0616
0.05920.05830.05480.05290.05100.05000.04900.04690.04470.04240.04000.03870.03740.0346
0.03160.02830.0245450
450×450
0.1494
1.06840.13980.26940.0130V
Ｑ
6.55235.67444.63314.14403.8764
3.58883.27612.93022.77992.62092.45162.26972.07201.96561.8532
1.73351.60491.53661.46511.43551.40531.38991.3744
1.34281.3104
1.27721.22581.20811.13481.0964
1.05651.03601.01500.97180.92660.87900.82880.80240.77520.71770.6552
0.58600.50750.97890.84770.69210.61910.57910.5361
0.48940.43770.41530.39150.36620.33900.30950.2936
0.27680.25890.23970.22950.21880.21440.20990.20760.20530.2006
0.19570.19080.18310.18040.16950.16380.15780.15470.15160.14510.13840.13130.12380.11980.11580.1072
0.09780.08750.0758600
600×600
0.26891.44780.18570.32550.0130V
Ｑ
7.91766.85695.59865.00754.68414.3366
3.95883.54083.3591
3.16702.96252.74272.50372.37532.23942.09481.9394
1.85681.7704
1.7346
1.69811.67951.66081.6226
1.58351.54341.4812
1.45991.37131.32481.27661.25181.2266
1.1743
1.11971.06221.00150.96970.93680.86730.79170.70810.61332.12901.84381.5054
1.34651.2595
1.1661
1.06450.95210.90320.8516
0.79660.73750.6732
0.63870.60210.5632
0.52150.49920.47600.46640.45660.4516
0.44650.43630.42580.41500.3982
0.39250.36870.3562
0.3432
0.33660.32980.31570.30100.2856
0.26930.26070.25190.23320.21280.19040.1649

Ｕ字溝（上ぶた式Ｕ形側溝）

マニング（ｍａｎｎｉｎｇ）公式による流速・流量表

V = 1/n × Ｒ2/3 × I1/2
Q=A×V
ここで，

V ： 流速 （m/sec)n ： 粗度係数0.014

R ： 径深 （m) = Ａ/ＰA ： 通水断面積 （m2)
P ： 潤辺 （m）
I ： 水路勾配 （‰) ※1‰（パーミル）＝0.1％
Ｑ ： 流量 （m3/sec)※8割水深(0.8H)で計算
1‰(=パーミル）

幅Ｂ

1mm

深さＨ
潤辺Ｐ
通水断面積Ａ

1000mm№1
呼び名
幅Ｂ×深さＨ（mm）
2
通水断面積 Ａ（m )潤辺 Ｐ（m)
径深 Ｒ（m)2/3
Ｒ
粗度係数 n1/2
勾配Ｉ（‰）
Ｉ
100.0
75.0
50.0
40.0
35.0
30.0
25.0
20.0
18.0
16.0
14.0
12.0
10.0
9.0
8.0
7.0
6.0
5.5
5.0
4.8
4.6
4.5
4.4
4.2
4.0
3.8
3.5
3.4
3.0
2.8
2.6
2.5
2.4
2.2
2.0
1.8
1.6
1.5
1.4
1.2
1.0
0.8
0.6

0.31620.27390.22360.20000.18710.17320.15810.14140.13420.12650.11830.10950.10000.09490.08940.08370.07750.07420.07070.06930.06780.0671
0.06630.06480.0632
0.0616
0.05920.05830.05480.05290.05100.05000.04900.04690.04470.04240.04000.03870.03740.0346
0.03160.02830.0245150
150×150
0.01690.35620.04740.13100.0140V
Ｑ
2.95842.56202.09191.87101.75021.62031.4792
1.32301.2551
1.1833
1.10691.02480.93550.88750.83670.78270.7246
0.69380.66150.64810.63450.62750.62050.60620.5916
0.5766
0.55340.54550.51240.49500.47700.46770.45830.43880.41830.39690.37420.36230.35000.32400.29580.26460.22910.04990.04320.03530.03160.02950.02730.02490.02230.02120.01990.01870.01730.01580.01490.01410.01320.01220.01170.01110.01090.01070.01060.01040.01020.00990.00970.00930.00920.00860.00830.00800.00790.00770.00740.00700.00670.00630.00610.00590.00540.00490.00440.0038180
180×1800.02410.41790.05770.14930.0140V
Ｑ
3.37272.92092.38492.13311.9953
1.8473
1.6863
1.50831.43091.3491
1.26191.1683
1.06651.01180.95390.89230.82610.79090.75410.73890.72330.71540.70740.6912
0.67450.65740.63090.62190.58410.56430.54380.5332
0.52250.50020.47690.45250.4266
0.41300.39900.36940.33720.3016
0.26120.08120.07030.05740.05140.04800.04450.0406
0.03630.03440.03250.03040.02810.02570.02430.02290.02150.01990.01900.01810.01780.01740.01720.01700.01660.01620.01580.01520.01490.01400.01350.01310.01280.01250.01200.01140.01090.01020.00990.00960.00890.00810.00720.0062240
240×2400.04280.56540.07570.17890.0140V
Ｑ
4.04203.50052.85812.55642.3913
2.21392.02101.80761.71491.61681.51231.4002
1.2782
1.2126
1.1432
1.06940.99000.94790.90380.88550.86690.85740.84780.82830.80840.78790.75610.74530.70010.67630.65170.63910.62610.59950.57160.54220.51120.49500.47820.44270.40420.36150.31300.17290.14980.12230.10940.10230.09470.08640.07730.07330.0691
0.06470.05990.05470.05180.04890.04570.04230.04050.0386
0.03780.03710.0366
0.03620.03540.03450.03370.03230.03180.02990.02890.02780.02730.02670.02560.02440.02320.02180.02110.02040.01890.01720.01540.0133300Ａ
300×2400.05220.61020.08550.19410.0140V
Ｑ
4.38373.79643.09982.77252.59342.40102.19181.9604
1.85981.75351.6402
1.51851.38621.3151
1.23991.15981.07381.02800.98020.96040.94020.92990.91950.89840.87670.85450.82010.80830.75920.73350.70680.69310.67910.65020.61990.58810.55450.53690.51860.48020.43830.39200.33950.22880.19810.16180.14470.13530.12530.11440.10230.09700.09150.08560.07920.07230.0686
0.06470.06050.05600.0536
0.05110.05010.04900.04850.04790.04680.04570.04460.04280.04210.0396
0.03820.03680.03610.03540.03390.03230.03060.02890.02800.02700.02500.02280.02040.0177

№2
呼び名
幅Ｂ×深さＨ(mm)2
通水断面積 Ａ（m )潤辺 Ｐ（m)
径深 Ｒ（m)2/3
Ｒ
粗度係数 n1/2
勾配Ｉ（‰）
Ｉ
100.0
75.0
50.0
40.0
35.0
30.0
25.0
20.0
18.0
16.0
14.0
12.0
10.0
9.0
8.0
7.0
6.0
5.5
5.0
4.8
4.6
4.5
4.4
4.2
4.0
3.8
3.5
3.4
3.0
2.8
2.6
2.5
2.4
2.2
2.0
1.8
1.6
1.5
1.4
1.2
1.0
0.8
0.6

0.31620.27390.22360.20000.18710.17320.15810.14140.13420.12650.11830.10950.10000.09490.08940.08370.07750.07420.07070.06930.06780.0671
0.06630.06480.0632
0.0616
0.05920.05830.05480.05290.05100.05000.04900.04690.04470.04240.04000.03870.03740.0346
0.03160.02830.0245300Ｂ
300×300
0.06520.70440.09260.20470.0140V
Ｑ
4.62324.00383.26912.92392.73512.53222.31162.0675
1.9614
1.8492
1.72981.6015
1.46191.38691.3076
1.22311.13241.0842
1.03371.01290.99150.98070.96970.94740.92460.90120.86490.85240.80070.77360.74540.73090.71620.68570.65380.62020.58470.56620.54700.5064
0.46230.41350.35810.30140.26100.21310.19060.17830.16500.15070.13480.12780.12050.11270.10440.09530.09040.08520.07970.07380.0706
0.06730.06600.0646
0.06390.0632
0.06170.06020.0587
0.05630.05550.05220.05040.04860.0476
0.04660.04470.04260.04040.03810.03690.0356
0.03300.03010.02690.0233300Ｃ
300×360
0.07850.7992
0.09820.21290.0140V
Ｑ
4.8077
4.1636
3.39963.04072.84432.63332.40382.15012.03971.92311.79891.66541.52031.44231.35981.27201.1776
1.12751.07501.05331.03111.01981.00840.98530.96150.93720.89940.88650.83270.80440.77520.76010.74480.71310.67990.64500.6081
0.58880.56880.52660.48070.43000.37240.37740.32680.26680.23860.22320.20670.18860.16870.16010.15090.14120.13070.11930.11320.10670.09980.09240.08850.08430.08260.08090.08000.07910.07730.07540.07350.0706
0.06950.06530.06310.06080.0596
0.05840.05590.05330.05060.04770.04620.0446
0.04130.03770.03370.0292360Ａ
360×300
0.07840.75640.10360.22060.0140V
Ｑ
4.98244.31493.5231
3.1511
2.94762.72902.49122.2282
2.11381.99291.8642
1.72591.57551.49471.4092
1.31821.2204
1.1684
1.1141
1.0916
1.0686
1.05691.0451
1.0211
0.9964
0.97120.93210.91870.86290.83370.80330.78770.77180.73900.7046
0.66840.63020.61020.58950.54580.49820.4456
0.38590.3906
0.33820.27620.24700.23100.21390.19530.1746
0.16570.15620.14610.13530.12350.11710.11040.10330.0956
0.09160.08730.08550.08370.08280.08190.08000.07810.07610.07300.07200.0676
0.06530.06290.06170.06050.05790.05520.05240.04940.04780.04620.04270.03900.03490.0302360Ｂ
360×360
0.09400.85090.11050.23030.0140V
Ｑ
5.20134.5044
3.67783.2896
3.07712.84882.60062.32612.20672.0805
1.94611.80171.64481.56031.47111.37611.27401.21981.16301.1395
1.1155
1.1033
1.09101.06591.0402
1.01390.97300.95900.90080.87030.83860.82240.80570.77140.73550.69780.65790.63700.61540.56970.52010.46520.40280.48890.42340.34570.30920.28920.26770.24440.21860.20740.19550.18290.16930.15460.14660.13820.12930.11970.1146
0.10930.10710.10480.10370.10250.1001
0.0977
0.09530.09140.09010.08460.08180.07880.07730.07570.07250.0691
0.0655
0.06180.05980.05780.05350.04880.04370.0378

№3
呼び名
幅Ｂ×深さＨ(mm)2
通水断面積 Ａ（m )潤辺 Ｐ（m)
径深 Ｒ（m)2/3
Ｒ
粗度係数 n
勾配Ｉ（‰）
Ｉ1/2
100.0
75.0
50.0
40.0
35.0
30.0
25.0
20.0
18.0
16.0
14.0
12.0
10.0
9.0
8.0
7.0
6.0
5.5
5.0
4.8
4.6
4.5
4.4
4.2
4.0
3.8
3.5
3.4
3.0
2.8
2.6
2.5
2.4
2.2
2.0
1.8
1.6
1.5
1.4
1.2
1.0
0.8
0.6

0.31620.27390.22360.20000.18710.17320.15810.14140.13420.12650.11830.10950.10000.09490.08940.08370.07750.07420.07070.06930.06780.0671
0.06630.06480.0632
0.0616
0.05920.05830.05480.05290.05100.05000.04900.04690.04470.04240.04000.03870.03740.0346
0.03160.02830.0245450
450×450
0.1494
1.06840.13980.26940.0140V
Ｑ
6.08425.26914.3022
3.84803.59953.33253.04212.72092.58132.43372.2765
2.1076
1.92401.82521.72081.60971.4903
1.42681.36041.33301.30491.2906
1.2762
1.24691.21681.18601.1382
1.12181.05381.01800.98100.96200.94250.90240.86040.81620.76960.74510.71990.66650.60840.54410.47120.90890.78720.64270.57480.53770.49780.45440.40650.3856
0.36350.34010.31480.28740.2726
0.25700.24040.2226
0.21310.20320.19910.19490.19280.19060.18620.18170.17710.17000.16750.15740.15200.14650.14370.14080.13480.12850.12190.11490.11130.10750.09950.09080.08120.0703600
600×600
0.26891.44780.18570.32550.0140V
Ｑ
7.3521
6.3671
5.19874.64984.34954.02693.67603.28793.11922.94082.75092.54682.32492.20562.0794
1.94511.80081.7242
1.64391.61071.57681.5596
1.54211.50671.47041.43311.37541.35561.27341.23021.1854
1.1624
1.13891.09041.03970.98630.92990.90040.86990.80530.73520.65750.5694

1.97691.7121
1.39791.2503
1.16951.08280.98840.88410.83870.79070.73970.68480.62510.59300.5591
0.52300.4842
0.46360.44200.43310.42400.41930.4146
0.40510.39530.38530.36980.36450.34240.33080.31870.31250.30620.29320.27950.26520.25000.24210.23390.21650.19760.17680.1531

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

150 （150×150）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.0910 × 2 +0.0461 × 2 +0.0820＝ 0.3562
通水断面積
A ＝ （

0.1480+0.1400） × 0.1200/ 2 -0.0002 × 2＝ 0.0169
径深

R ＝ A / P
＝ 0.0169

流速/=0.0474V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.3562Q ＝ A × V
＝ 0.0169 ×＝

× 0.0474 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

180 （180×180）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.0954 × 2 +0.0772 × 2 +0.0727＝ 0.4179
通水断面積
A ＝ （

0.1780+0.1700） × 0.1440/ 2 -0.0005 × 2＝ 0.0241
径深

R ＝ A / P
＝ 0.0241

流速/=0.0577

V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.4179Q ＝ A × V
＝ 0.0241 ×＝

× 0.0577 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

240 （240×240）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.1442 × 2 +0.0765 × 2 +0.1240＝ 0.5654
通水断面積
A ＝ （

0.2360+0.2200） × 0.1920/ 2 -0.0005 × 2＝ 0.0428
径深

R ＝ A / P
＝ 0.0428

流速/=0.0757

V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.5654

Q ＝ A × V
＝ 0.0428 ×＝× 0.0757 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

300A （300×240）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.1467 × 2 +0.0744 × 2 +0.1680＝ 0.6102
通水断面積
A ＝ （

0.2920+0.2600） × 0.1920/ 2 -0.0004 × 2＝ 0.0522
径深

R ＝ A / P
＝ 0.0522

流速/=0.0855V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.6102Q ＝ A × V
＝ 0.0522 ×＝× 0.0855 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

300B （300×300）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.1938 × 2 +0.0752 × 2 +0.1664＝ 0.7044
通水断面積
A ＝ （

0.2920+0.2600） × 0.2400/ 2 -0.0005 × 2＝ 0.0652
径深

R ＝ A / P
＝ 0.0652

流速/=0.0926V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.7044

Q ＝ A × V
＝ 0.0652 ×＝× 0.0926 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

300C （300×360）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.2411 × 2 +0.0758 × 2 +0.1654＝ 0.7992
通水断面積
A ＝ （

0.2920+0.2600） × 0.2880/ 2 -0.0005 × 2＝ 0.0785
径深

R ＝ A / P
＝ 0.0785

流速/=0.0982V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.7992Q ＝ A × V
＝ 0.0785 ×＝× 0.0982 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

360A （360×300）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.1948 × 2 +0.0744 × 2 +0.2180＝ 0.7564
通水断面積
A ＝ （

0.3500+0.3100） × 0.2400/ 2 -0.0004 × 2＝ 0.0784
径深

R ＝ A / P
＝ 0.0784

流速/=0.1036V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.7564

Q ＝ A × V
＝ 0.0784 ×＝

× 0.1036 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

360B （360×360）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.2420 × 2 +0.0751 × 2 +0.2167＝ 0.8509
通水断面積
A ＝ （

0.3500+0.3100） × 0.2880/ 2 -0.0005 × 2＝ 0.0940
径深

R ＝ A / P
＝ 0.0940

流速/=0.1105V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

0.8509Q ＝ A × V
＝ 0.0940 ×＝× 0.1105 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

450 （450×450）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.2943 × 2 +0.1061 × 2 +0.2676＝ 1.0684
通水断面積
A ＝ （

0.4400+0.4000） × 0.3600/ 2 -0.0009 × 2＝ 0.1494
径深

R ＝ A / P
＝ 0.1494

流速/=0.1398V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

1.0684

Q ＝ A × V
＝ 0.1494 ×＝

× 0.1398 (2/3) ×（1/2）

流速流量計算
断面形状

Ｕ字溝（上ぶた式Ｕ形側溝）

水路勾配 I（‰）

600 （600×600）※8割水深で計算

粗度係数 ｎ潤辺

P ＝ 0.4140 × 2 +0.1065 × 2 +0.4068＝ 1.4478
通水断面積
A ＝ （

0.5880+0.5400） × 0.4800/ 2 -0.0009 × 2＝ 0.2689
径深

R ＝ A / P
＝ 0.2689

流速/=0.1857

V ＝ 1/ｎ × R2/3 × I1/2
＝ 1 /
＝

流量

1.4478Q ＝ A × V
＝ 0.2689 ×＝× 0.1857 (2/3) ×（1/2）