Table 4-2 Summary of computations illustrating application of the rational method to storm-sewer design.
| (1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
(11) |
(12) |
(13) |
(14) |
(15) |
(16) |
(17) |
(18) |
(19) |
(20) |
(21) |
(22) |
(23) |
(24) |
| 1 |
1-6 |
1-5 |
400 |
2.64 |
2.64 |
20.0 |
1.4 |
0.3 |
3.7 |
1.11 |
2.93 |
0.85 |
12 |
3.3 |
4.0 |
4.6 |
9 |
... |
3.40 |
93.0 |
89.6 |
98.4 |
94.9 |
| 1 |
1-5 |
1-4 |
400 |
3.61 |
6.25 |
21.4 |
1.2 |
0.3 |
3.6 |
1.08 |
6.75 |
0.75 |
18 |
9.2 |
5.1 |
5.6 |
11 |
0.40 |
3.00 |
89.2 |
86.2 |
94.9 |
91.8 |
| 1 |
1-4 |
1-3 |
400 |
3.88 |
10.13 |
22.6 |
1.2 |
0.42 |
3.4 |
1.43 |
14.50 |
0.45 |
24 |
15.2 |
4.8 |
5.6 |
18 |
0.40 |
1.80 |
85.8 |
84.0 |
91.8 |
89.7 |
| 3 |
3-2 |
3-1 |
400 |
5.55 |
5.55 |
20.0 |
1.1 |
0.3 |
3.7 |
1.11 |
6.16 |
1.00 |
15 |
6.4 |
5.1 |
5.9 |
12 |
... |
4.00 |
91.0 |
87.0 |
96.2 |
92.3 |
| 3 |
3-1 |
1-3 |
400 |
6.43 |
11.98 |
21.1 |
1.1 |
0.3 |
3.6 |
1.08 |
12.92 |
0.60 |
24 |
17.5 |
5.5 |
6.1 |
15 |
0.60 |
2.40 |
86.4 |
84.0 |
92.3 |
89.7 |
| 1 |
1-3 |
1-2 |
400 |
3.92 |
26.03 |
23.8 |
1.10 |
0.39 |
3.3 |
1.29 |
33.60 |
0.30 |
36 |
37.0 |
5.1 |
5.9 |
26 |
0.80 |
1.20 |
83.2 |
82.0 |
89.7 |
89.5 |
| 2 |
2-1 |
1-2 |
400 |
2.52 |
2.52 |
20.0 |
1.4 |
0.3 |
3.7 |
1.11 |
2.80 |
0.90 |
12 |
3.2 |
4.1 |
4.7 |
9 |
... |
3.6 |
87.5 |
83.9 |
92.7 |
89.5 |
| 1 |
1-2 |
1-1 |
400 |
3.86 |
32.41 |
24.9 |
1.1 |
0.41 |
3.2 |
1.31 |
42.50 |
0.24 |
42 |
50.0 |
5.2 |
5.9 |
29 |
0.40 |
0.96 |
81.6 |
80.64 |
89.5 |
88.5 |
| 1 |
1-1 |
Out-
fall |
125 |
5.44 |
37.85 |
26.0 |
... |
0.44 |
3.2 |
1.41 |
53.20 |
0.30 |
42 |
56.0 |
5.7 |
6.6 |
33 |
0.1 |
0.38 |
80.54 |
80.16 |
88.5 |
... |
KEY
(1) Line;
(2) Manhole, From;
(3) Manhole, To;
(4) Length, ft;
(5) Area, increment, acres;
(6) Area, total, acres;
(7) Flow time, to upper end, minutes;
(8) Flow time, in section, minutes;
(9) Average runoff coefficient;
(10) Rainfall, in/h;
(11) Runoff, ft2/s/ac;
(12) Total runoff, ft3/s;
(13) Slope of Sewer, percentage;
(14) Diameter, in;
(15) Capacity, full, ft3/s;
(16) Velocity, full, ft/s;
(17) Design flow velocity, ft/s;
(18) Depth of flow, in;
(19) Manhole invert drop, ft;
(20) Fall in sewer, ft;
(21) Sewer invert, upper end;
(22) Sewer invert, lower end;
(23) Ground elevation, upper end;
(24) Ground elevation, lower end.
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