Page 252 - Fair, Geyer, and Okun's Water and wastewater engineering : water supply and wastewater removal

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212 Chapter 6 Water Distribution Systems: Components, Design, and Operation

Elevation of
Take-off F water table
E 50´
H 1 50.0´ H 0
H 0 106´
110´ 1,800´ 10˝ 100 H 900´ 10˝ 100 69.2´ H 1
H
0
1
0
E 160´ 60.0´ 36.8´ E 100´
0
1
E 156´ D 2,200´ 8˝ 100 E E 119.2´
1
H 1 44.0´ 600´ 10˝ 120 1,000´ 10˝ 120 50.0´ H 0
H 0 40.0´ H 0 H 1 51.9´ H 1
C 50.0´ 28.9´
Elevation of 1,800´ 6˝ 100 B 30.0´ H 0
Inflow water table E 0 1 150´ 8.9´ H 1 Elevation of
E 200´
E 171.1´
A water table
E 180´
500´ 12˝ 120
Inflow
Figure 6.13 Plan of Network Aanalyzed by the Method of Balancing Flows (Example 6.4)
Conversion factors: 1 1 ft 0.3048 m; 1 1 in. 25.4 mm

Table 6.5 Analysis of the Network of Figure 6.13. Using the Balancing Flows Method a,b (Example 6.4)
Junction Length, Diameter, Q 0 ,
Letter Pipe ft in. C H 0 , ft s 0 , ‰ MGD Q 0 /H 0 h 0 , ft H 1 , ft
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)

B AB 500 12 120 + 30 60.0 + 7.33 0.244 - 21.1 + 8.9
BE 1,000 c 10 120 - 50 50.0 - 4.12 0.082 - 21.1 + 19.2 - 51.9
CB 1,800 6 100 + 50 27.8 + 0.66 0.013 - 21.1 + 28.9
1.85 * ( 3.87) , 0.339 = + 21.1
+
D CD 600 10 120 + 40 66.7 + 4.8 0.120 + 4.01 + 44.0
DE 2,200 d 8 100 - 60 27.3 - 1.37 0.023 + 4.01 + 19.2 - 36.8
DF 1,800 10 100 - 110 61.1 - 3.82 0.037 + 4.01 - 106.0
1.85 * ( 0.39) , 0.180 = - 4.01
-
E BE 1,000 e 10 120 + 50 50.0 + 4.12 0.082 - 19.2 + 21.1 + 51.9
DE 2,200 f 8 100 + 60 27.3 + 1.37 0.023 - 19.2 - 4.01 + 36.8
EF 900 10 100 - 500 55.6 - 3.64 0.073 - 19.2 - 69.2
1.85 * ( 1.85) , 0.178 = + 19.2
+
a
For Example 6.4.
b
Only the first head correction is calculated for purposes of illustration.
c
First consideration of pipe BE.
d
First consideration of pipe DE.
e
Second consideration of pipe BE.
f
Second consideration of pipe DE.
Conversion factors: 1 ft 0.3048 m; 1 in. 25.4 mm; 1 MGD 3.785 MLD.