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Pineda Weir PDF

The document contains 12 problems involving calculations of discharge over various weir structures using different weir formulas. The problems provide data on dimensions of the weirs such as length and height, head of water, channel dimensions, and discharge measurements. The goals are to use the appropriate weir formula to calculate discharge or other parameters such as required weir height or length. Weir structures involved include standard rectangular, contracted, triangular, V-notch, and Cipolletti weirs. Calculations require selection of the correct formula and insertion of dimensional data. ROMAINE CATE T. PINEDA – BSCEN V Topic: PROFESSOR: ENGR. LARRY

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401 views23 pages

Pineda Weir PDF

The document contains 12 problems involving calculations of discharge over various weir structures using different weir formulas. The problems provide data on dimensions of the weirs such as length and height, head of water, channel dimensions, and discharge measurements. The goals are to use the appropriate weir formula to calculate discharge or other parameters such as required weir height or length. Weir structures involved include standard rectangular, contracted, triangular, V-notch, and Cipolletti weirs. Calculations require selection of the correct formula and insertion of dimensional data. ROMAINE CATE T. PINEDA – BSCEN V Topic: PROFESSOR: ENGR. LARRY

Uploaded by

Jovan Bucol
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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PAGE 158-159

Problem #1. Compute the discharge over a standard rectangular sharp-crested weir for several combinations of the
following formulas and data.

FORMULA Length of Weir. L(ft) Height of Weir. P(ft) Head. H(ft) Water Temperature
(a) Francis (g) 1.0 (l) 0.5 (r) 0.2 (y) 39 F
(b) Bazin (h) 2.0 (m) 1.0 (s) 0.4 (z) 68 F
(c) King (i) 3.0 (n) 1.5 (t) 0.7
(d) Swiss (j) 5.0 (o) 2.0 (u) 1.0
(e) Rehbock (k) 10.0 (p) 4.0 (v) 1.5
(f) Harris (q) 10.0 (w) 2.0
(x) 3.0

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 158-159
Problem #4. Compute by the King and the Rehbock formulas the discharge per foot of length over a standard weir 3 ft
high under heads of 0.250 and 1.250 ft.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 158-159
Problem #5. A test measurement of flow over a standard weir 1.00 ft high in a flume 1.996 ft wide at a head of 0.5171 ft
showed a total volume of 941.4 cu ft of water discharged in 362.3 sec. The water temperature was 42 F. Assuming the
measurement of flow to be correct, compute the percentage of error in the discharge computed by each of the weir
formulas 34 to 39.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 158-159
Problem #6. A sharp-crested weir 4.0 ft high extends across a rectangular channel 10.0 ft wide. If the measured head is
1.22 ft, determine the discharge using the Francis and the Rehbock formulas. Compare with the discharge given by the
approximate Francis and Rehbock formulas 41 and 42.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 158-159
Problem #7. A sharp-crested weir 3.5 ft high extends across a rectangular channel 12 ft wide. If the measured head is
1.54 ft, determine the discharge, using the King and the Swiss formulas.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 158-159
Problem #8. A sharp-crested weir 2 ft high extends across a rectangular channel 8 ft wide conducting irrigation water.
If the measured head is 4 in., determine the discharge.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 158-159
Problem #9. A rectangular channel 20 ft wide has a 3 ft depth of water flowing with a mean-velocity of 2.45 ft per sec.
Determine the height of standard sharp-crested weir that will increase the depth in the channel of approach to 5 ft.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 158-159
Problem #10. A sharp-crested weir 3.0 ft high extends across a rectangular channel, 20 ft wide, in which there is 100 cfs
flowing. Determine the depth of water upstream from the weir.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 164-165
Problem #2. A contracted rectangular weir 10.0 ft long discharges water under a head of 9 3/16 in. Compute the
discharge by: (a) Francis correction applied to Rehbock formula; (b) Cone formula.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 164-165
Problem #4. A contracted rectangular weir 10 ft long is built in the center of a rectangular channel 20 ft wide. How high
is the weir if the depth of water upstream is 3.50 ft when the discharge is 40 cfs?

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 164-165
Problem #6. The discharge of water over a 45 triangular weir is 0.728 cfs. What is the head?

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 164-165
Problem #8. The discharge of a light dust-proofing oil at 50 F over a 90 V-notch weir is 0.245 cfs. Compute the head.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 164-165
Problem #10. Compute the discharge of water over a Cipolletti weir 5.0 ft long under a head of 0.85 ft. Compare with
the discharge over a standard rectangular weir with the same length and head.

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
PAGE 164-165
Problem #12. What length of Cipolletti weir should be constructed so that the measured head will not exceed 1.50 ft
when the discharge is 120 cfs?

ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:


ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING
ROMAINE CATE T. PINEDA BSCEN V Topic: PROFESSOR:
ENGR. LARRY SALARZA
MINDANAO STATE UNIVERSITY - GSC WEIR CEA102 HYDRAUILICS ENGINEERING

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