Flowers Solar Farm, LLC - SSW-Permit-LowDen-Supp-20090210-DEMLR-SPU

Form SW401-Low Density-Rev.3-2/10/09 Page 2 of 5

Calculation:
For uniform lot sizes:

(SA: ft2 x DF: ) – (RA: ft2) – (OA: ft2) = BUA per Lot = ft2
(No of Lots: )

For non-uniform lot sizes:

a. (SA: 1502385 ft2 x DF: .24) – (RA: 0 ft2) – (OA: 0 ft2) = Total allowable lot BUA = 360,572
ft2

b. Total BUA from lot listing: 57,447sf. b must be ≤ a

III. DESIGN INFORMATION

Complete the following table. If additional space is needed the information should be provided in the same
format as Table 1 and attached to this form. Rainfall intensity data can be found in Appendix 8.03 of the State
of North Carolina Erosion and Sediment Control Planning and Design Manual or at
http://hdsc.nws.noaa.gov/hdsc/pfds/

Table 1. Swale design information based on the 10-year storm.
Swale No. Drainage
Area (ac)
Impervious
Area (ac)
Grassed
Area (ac)
C Q
(cfs)
Slope
(%)
Vallow
(fps)
Vactual
(fps)
Flow
Depth (ft)
1 3.28 0 3.28 .25 5.8 1.7 3.5 2.66 .63
2 2.24 0 2.24 .25 3.9 2.6 3.5 2.73 .51
3 1.91 .005 1.905 .25 3.4 1.5 3.5 2.12 .54
4 0.61 0 0.61 .25 1.1 2.0 3.5 1.73 .34
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20