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Drainage Pipe Sizing Guide

This document provides calculations for sizing drainage water pipes using the Chezy equation and half bore pipe sizing method. It gives the Chezy equation for calculating flow velocity based on the Chezy constant, hydraulic mean depth, and slope. Tables show pipe diameters, slopes, maximum flows, and velocities for a range of pipe sizes from 65mm to 500mm using a 1.5% slope. Flow rates are also provided for 5 example drainage pools with numbers of overflows and resulting pipe diameters.

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76 views4 pages

Drainage Pipe Sizing Guide

This document provides calculations for sizing drainage water pipes using the Chezy equation and half bore pipe sizing method. It gives the Chezy equation for calculating flow velocity based on the Chezy constant, hydraulic mean depth, and slope. Tables show pipe diameters, slopes, maximum flows, and velocities for a range of pipe sizes from 65mm to 500mm using a 1.5% slope. Flow rates are also provided for 5 example drainage pools with numbers of overflows and resulting pipe diameters.

Uploaded by

daivd
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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CALCULATIONS OF DRAINAGE WATER PIPES SIZING (HALF BORE):

CALCULATIONS BASED ON CHEZY EQUATION & HALF BORE PIPE SIZING:


CHEZY EQUATION :
V = C(mi)½
WHERE
C : CHEZY CONSTANT (55) 55.00
m : HYDRULIC MEAN DEPTH = (D/4)
i : INCLINATION OR FALL SLOPE (%)
V : VELOCITY OF FLOW (m/s)

Flow Fall Intensity 100 mm/hr

Pool 2 Pool 3
# of OF Flow (L/s)Diam # of OF Flow (L/s)Diam
13 80 1 4.5 80
Diam. Inclination Max. Flow Max. Flow
V (m/s)
(mm) % (L/s) (gpm) 26 110 29 110
65.00 1.50% 0.61 2.01 31.82 39 110 3 13.5 150
80.00 1.50% 0.67 3.38 53.47 4 12 110 4 18 150
110.00 1.50% 0.79 7.50 118.54 5 15 150 5 22.5 150
150.00 1.50% 0.92 16.29 257.41 6 18 150 6 27 200
200.00 1.50% 1.07 33.44 528.40 7 21 150 7 31.5 200
250.00 1.50% 1.19 58.42 923.08 8 24 150 8 36 200
300.00 1.50% 1.30 92.16 1456.11 9 27 200 9 40.5 200
300.00 1.50% 1.30 92.16 1456.11 10 30 200 10 45 200
350.00 1.50% 1.41 135.49 2140.72 11 33 200 11 49.5 200
400.00 1.50% 1.51 189.18 2989.10 12 36 200 12 54 200
450.00 1.50% 1.60 253.96 4012.56 13 39 200 13 58.5 250
500.00 1.50% 1.68 330.49 5221.74 14 42 200 14 63 250
15 45 200 15 67.5 250
16 48 200 16 72 250
17 51 200 17 76.5 250
18 54 200 18 81 250
19 57 250 19 85.5 250
20 60 250 20 90 250
21 63 250 21 94.5 250
22 66 250 22 99 250
23 69 250 23 103.5 250
24 72 250 24 108 250
25 75 250 25 112.5 250
26 78 250 26 117 250
27 81 250 27 121.5 250
Pool 4 Pool 5
# of OF Flow (L/s)Diam # of OF Flow (L/s)Diam
1 2.3 80 1 3.5 80

2 4.6 80 27 110
3 6.9 110 3 10.5 110
4 9.2 110 4 14 150
5 11.5 110 5 17.5 150
6 13.8 150 6 21 150
7 16.1 150 7 24.5 150
8 18.4 150 8 28 200
9 20.7 150 9 31.5 200
10 23 150 10 35 200
11 25.3 150 11 38.5 200
12 27.6 200 12 42 200
13 29.9 200 13 45.5 200
14 32.2 200 14 49 200
15 34.5 200 15 52.5 200
16 36.8 200 16 56 250
17 39.1 200 17 59.5 250
18 41.4 200 18 63 250
19 43.7 200 19 66.5 250
20 46 200 20 70 250
21 48.3 200 21 73.5 250
22 50.6 200 22 77 250
23 52.9 200 23 80.5 250
24 55.2 250 24 84 250
25 57.5 250 25 87.5 250
26 59.8 250 26 91 250
27 62.1 250 27 94.5 250

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