1. Size of Roof Gutter
25 Year Storm Area 13800 ft^2
Intensity Slope
Flow (cfs) Depth (ft) Width (in) Depth (in) Duration
(in/hr) (ft/ft)
9.99 2.55 0.80 0.0043 9.60 1 minute storm event
6.36 1.63 0.70 0.0043 8.40 15 minute storm event
5.00 1.28 0.65 0.0043 7.80 30 minute storm event
4.02 1.03 0.61 0.0043 7.32 45 minute storm event
3.43 0.88 0.58 0.0043 6.96 1 hour storm event
2.21 0.56 0.51 0.0043 6.12 2 hour storm event
1.68 0.43 0.47 0.0043 5.64 3 hour storm event
1.33 0.34 0.44 0.0043 5.28 4 hour storm event
0.98 0.25 0.40 0.0043 4.80 6 hour storm event
0.55 0.14 0.33 0.0043 3.96 12 hour storm event
0.324 0.08 0.28 0.0043 3.36 24 hour storm event
0.83
Required Width 13 in
Required Height 6.5 in
Flow .80 (cfs)
10 Year Storm Area 13800 ft^2
Intensity Slope
Flow (cfs) Depth (ft) Width (in) Depth (in) Duration
(in/hr) (ft/ft)
8.84 2.26 0.77 0.0043 9.24 1 minute storm event
5.56 1.42 0.67 0.0043 8.04 15 minute storm event
4.26 1.09 0.62 0.0043 7.44 30 minute storm event
3.37 0.86 0.58 0.0043 6.96 45 minute storm event
2.9 0.74 0.55 0.0043 6.60 1 hour storm event
1.83 0.47 0.48 0.0043 5.76 2 hour storm event
1.41 0.36 0.44 0.0043 5.28 3 hour storm event
1.13 0.29 0.42 0.0043 5.04 4 hour storm event
0.83 0.21 0.38 0.0043 4.56 6 hour storm event
0.46 0.12 0.32 0.0043 3.84 12 hour storm event
0.273 0.07 0.27 0.0043 3.24 24 hour storm event
0.72
Required Width 12 in
Required Height 6 in
Flow .65 (cfs)
Final Gutter Width 7 in
Final Gutter Height 7 in
*These dimensions were chosen due to there being 3
downspouts located on the 2nd story gutter system.