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4 / 9

C

6.87-50.16

0.16-0.35

0.25

0.3048

Vertical

3:1

7.62

D

7-43.28

0.16-0.37

0.25

0.3048

6:1

1:1

7.62

E

7.08-50.16

0.16-0.36

0.25

0.3048

6:1

2:1

7.62

F

8.87-44.24

0.18-0.33

0.25

0.3048

6:1

3:1

7.62

G

9.11-46.98

0.11-0.26

0.25

0.3048

10:1

2:1

7.62

H

10.46-47.98

0.13-0.26

0.25

0.3048

Vertical

1:1

15.24

I

7.65-48.4

0.08-0.28

0.25

0.3048

Vertical

2:1

15.24

J

7.43-51.9

0.10-0.28

0.25

0.3048

Vertical

3:1

15.24

L

10.73-43.28

0.37-0.22

0.25

0.3048

6:1

2:1

15.24

M

13.65-45.92

0.26-0.36

0.25

0.3048

10:1

3:1

15.24

N

4.90-43.28

0.05-0.22

0.25

0.3048

10:1

2:1

15.24

VOL. 3, NO. 2, APRIL 2008

ARPN Journal of Engineering and Applied Sciences

©2006-2008 Asian Research Publishing Network (ARPN). All rights reserved.

www.arpnjournals.com

ISSN 1819-6608

Step height

2.3. Experimental

procedure

In this study, the experiment setup is not a scaled physical model for a specific flume in the field. The experiments carried out with different discharges. For this purpose the entrance valve on the inlet pipe was opened. For a selected model type a range of discharges which could be obtained from the constant-head storage tank of

laboratory

were examined. Depth

of the flow above the

crest level at approach channel was measured (h1) when the tail water gate of the flume was fully open (free flow measurements). At that moment, depth of the flow in the tail water channel above the crest elevation was. Figure-3 shows Flumes G in operation.

Flumes

U.S. slope

Tabel-1. Tested flumes and relative information for each kind of them.

Throat

Throat

width, w

length, L

(m)

(m)

Range of

Approach

discharges

channel

tested (m3/s)

Froude

number

D.S. slope

Figure-3. Longitudinal view looking at flume G, operating at a flow rate of 10 lit/s.

3.0 RESULTS AND DISCUSSIONS

All of the measured and calculated quantities from the experiments conducted in the course of this study were given by Asare (2006). In the following sections results of experiments were analyzed and summarized:

3.1. Flow measurement error

For each test flow, the measured upstream head was used to compute the flow through the structure using the analytically determined flume rating equation, and this

65

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