The Arbors at Meadowlark - Supplemental Swale Table

Table 1. Swale design information based on 10-year storm.
Swale No. Drainage
Area (ac)
Impervious
Area (ac)
Grassed
Area (ac)
*Future Lot
Area (ac)
**C Q
(cfs)
Slope
(%)
Vallow
(fps)
Vactual
(fps)
Flow
Depth (ft)
1 – Reach 1 0.22 0.12 0.10 0.0 0.57 0.68 4.0 2.5 0.52 0.41
1 – Reach 2

3.66 1.74 1.92 0.0 0.61 12.28 2.0 2.5 2.10 1.10
1 – Reach 3

7.50 2.10 0.0 2.71 0.50 24.42 6.0 15.0 5.10 0.97
1 – Reach 4

11.70 2.76 0.0 5.62 0.60 38.45 3.3 15.0 3.43 0.66
2 0.75 0.36 0.24 0.15 0.67 2.75 12.0 2.5 1.87 0.44
3 0.95 0.28 0.0 0.53 0.65 3.39 12.0 2.5 1.84 0.48
4 0.79 0.26 0.17 0.36 0.64 2.77 8.0 2.5 1.57 0.50
5 0.43 0.32 0.44 0.0 0.58 2.44 12.0 2.5 2.21 0.46
6 0.83 0.23 0.28 0.37 0.60 2.88 13.0 2.5 1.90 0.45
7 0.93 0.24 0.13 0.57 0.64 3.28 12.0 2.5 2.16 0.45
8 2.37 0.43 0.25 1.69 0.63 8.14 9.0 15.0 3.56 0.63
9 – Reach 1

0.72 0.0 0.0 0.72 0.60 2.35 1.4 2.5 0.65 0.94
9 – Reach 2

2.13 0.0 0.0 0.72 0.60 6.99 4.5 2.5 2.32 0.85
10 0.61 0.0 0.0 0.61 0.60 2.03 10 2.5 1.41 0.44

*Future Lot Area column added to standard swale table to account for future lots with a runoff coefficient (C) equal to 0.60.
**C-Value weighted based on impervious area, Grassed Area, and Future Lot Area.