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Table 12.1 Hydraulic elements of a circular section
d/D
k
a
k
r
q/Q
0.02
0.0037
0.0132
0.0007
0.04
0.0105
0.0262
0.0030
0.06
0.0192
0.0389
0.0071
0.08
0.0294
0.0513
0.0130
0.10
0.0409
0.0635
0.0209
0.12
0.0534
0.0755
0.0306
0.14
0.0668
0.0871
0.0421
0.16
0.0811
0.0986
0.0555
0.18
0.0961
0.1097
0.0707
0.20
0.1118
0.1206
0.0876
0.22
0.1281
0.1312
0.1061
0.24
0.1449
0.1416
0.1263
0.26
0.1623
0.1516
0.1480
0.28
0.1800
0.1614
0.1712
0.30
0.1982
0.1709
0.1958
0.32
0.2167
0.1802
0.2217
0.34
0.2355
0.1891
0.2489
0.36
0.2546
0.1978
0.2772
0.38
0.2739
0.2062
0.3066
0.40
0.2934
0.2142
0.3369
0.42
0.3130
0.2220
0.3682
0.44
0.3328
0.2295
0.4002
0.46
0.3527
0.2366
0.4329
0.48
0.3727
0.2435
0.4662
(table continued on next page)
p
= density of wastewater, kg/m
g
= acceleration due to gravity, m/s
2
r
= hydraulic radius, m
i
= sewer gradient, m/m
and:
where q = peak flow, 1/s
k
1
= peak factor (= daily peak flow/average daily flow)
k
2
= return factor (= sewage generation/water consumption)
w
= water consumption, litres per caput per day (lcd)
N
= number of households served
p
= average household size
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