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Chesterfield Landing Phase 2
Post-Development Time of Concentration Calculations
STM B4
153 ft overland flow 10.5% slope 0.35 C-value 11.0 min Seelye Chart
28 ft paved swale 13 ft height 0.1 min. Kirpich Chart
11.1 min.
STM 135
193 ft overland flow 11.7% slope 0.35 C-value 11.8 min Seelye Chart
132 ft paved swale 3.7 ft height 0.2 min. Kirpich Chart
12.0 min.
200 ft overland flow 16.0% slope 0.35 C-value 11.4 min Seelye Chart
81 ft s. c. flow-field 3.7% slope 1.4 fps velocity 1.0 min. NEH Figure 15-4
77 ft swale 1.5 ft height 0.7 min. Kirpich Chart
13.1 min.
200 ft overland flow 15.5% slope 0.35 C-value 11.5 min Seelye Chart
36 ft s. c.flow-field 8.3% slope 2.0 fps velocity 0.3 min. NEH Figure 15-4
130 ft swale 3.5 ft height 1.3 min. Kirpich Chart
13.1 min.
STM B8
200 ft overland flow 6.5% slope 0.35 C-value 13.6 min Seelye Chart
338 ft swale 22 ft height 2.0 min. Kirpich Chart
15.6 min.
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