Discharge of standard Cipolletti weirs in ft³/sec (cfs).
Computed from the formula Q=3.367LH1.5

Head

Weir Length, L, ft

H , ft

0.5

1.0

1.5

2.0

3.0

4.0

5.0

               

.01

.002

.003

.005

.007

.010

.013

.017

.02

.005

.010

.014

.019

.029

.038

.048

.03 .009 .018 .026 .035 .053 .070 .087
.04 .013 .027 .040 .054 .081 .108 .135
.05 .019 .038 .057 .075 .113 .151 .188
               
.06 .025 .050 .074 .099 .148 .198 .247
.07 .031 .062 .093 .125 .187 .249 .312
.08 .038 .076 .114 .152 .229 .305 .381
.09 .045 .091 .136 .182 .273 .364 .455
.10 .053 .107 .160 .213 .319 .426 .532
               
.11 .061 .123 .184 .246 .369 .491 .614
.12 .070 .140 .210 .280 .420 .560 .700
.13 .079 .158 .237 .316 .473 .631 .789
.14 .088 .176 .265 .353 .529 .705 .882
.15 .098 .196 .293 .391 .587 .782 .978
               
.16 .108 .216 .323 .431 .646 .862 1.08
.17 .118 .236 .354 .472 .708 .944 1.18

.18

.129

.257

.386

.514

.771

1.03

1.28

.19

.139

.279

.418

.558

.837

1.12

1.39

.20

.151

.301

.452

.602

.903

1.20

1.51

               

.21

.162

.324

.486

.648

.972

1.30

1.62

.22

.174

.347

.521

.695

1.04

1.39

1.74

.23

.186

.371

.557

.743

1.11

1.49

1.86

.24

.200

.396

.594

.792

1.19

1.58

1.98

.25

.214

.421

.631

.842

1.26

1.68

2.10

               

.26

-----

.446

.670

.893

1.34

1.79

2.23

.27

-----

.472

.709

.945

1.42

1.89

2.36

.28

-----

.499

.748

.998

1.50

2.00

2.49

.29

-----

.526

.789

1.05

1.58

2.10

2.63

.30

-----

.553

.830

1.11

1.66

2.21

2.77

               

.31

-----

.581

.872

1.16

1.74

2.32

2.91

.32

-----

.609

.914

1.22

1.83

2.44

3.05

.33

-----

.638

.957

1.28

1.91

2.55

3.19

.34

-----

.668

1.00

1.34

2.00

2.67

3.34

.35

-----

.697

1.05

1.39

2.09

2.79

3.49

               

.36

-----

.727

1.09

1.45

2.18

2.91

3.64

.37

-----

.758

1.14

1.52

2.27

3.03

3.79

.38

-----

.789

1.18

1.58

2.37

3.15

3.94

.39

-----

.820

1.23

1.64

2.46

3.28

4.10

.40

-----

.852

1.28

1.70

2.56

3.41

4.26

               

.41

-----

.884

1.33

1.77

2.65

3.54

4.42

.42

-----

.916

1.37

1.83

2.75

3.67

4.58

.43

-----

.949

1.42

1.90

2.85

3.80

4.75

.44

-----

.983

1.47

1.97

2.95

3.93

4.91

.45

-----

1.02

1.52

2.03

3.05

4.07

5.08

               

.46

-----

1.05

1.58

2.10

3.15

4.20

5.25

.47

-----

1.08

1.63

2.17

3.25

4.34

5.42

.48

-----

1.12

1.68

2.24

3.36

4.48

5.60

.49

-----

1.16

1.73

2.31

3.46

4.62

5.77

.50

-----

1.20

1.79

2.38

3.57

4.76

5.95

               

.51

-----

-----

-----

2.45

3.68

4.91

6.13

.52

-----

-----

-----

2.53

3.79

5.05

6.31

.53

-----

-----

-----

2.60

3.90

5.20

6.50

.54

-----

-----

-----

2.67

4.01

5.34

6.68

.55

-----

-----

-----

2.75

4.12

5.49

6.87

               

.56

-----

-----

-----

2.82

4.23

5.64

7.05

.57

-----

-----

-----

2.90

4.35

5.80

7.24

.58

-----

-----

-----

2.97

4.46

5.95

7.44

.59

-----

-----

-----

3.05

4.58

6.10

7.63

.60

-----

-----

-----

3.13

4.69

6.26

7.82