1240815StormWaterManagementReportrcd 3 12 2026

12/12/2025 Casey & Keller, Inc. LAND surveyors + civil engineers + PLANNERS N.J. STATE BOARD OF PROFESSIONAL ENGINEERS & LAND SURVEYORS CERTIFICATE OF AUTHORIZATION NO. 24GA27985400 258 Main Street, Millburn, NEW JERSEY, 07041 voice :973-379-3280 fax: 973-379-7993 Job # 1240815 Job Name: 512-516 Pleasant Valley Way Structure: SCOUR 1 Designed by: TF Checked by: JAA Q= 2.22 C.F.S. W o= 1.00 FT. D o= 1.00 FT. q=Q/W o= 2.22 C.F.S. TW= 0.20 FT. (For areas where Tw cannot be computed, use Tw = 0.2Do) d50 Stone size formula Where Y = 1/2 Do d50 =0.0125 * q^1.33 = 0.18 Ft. 3 " STONE USED TW 0.50 Ft. = Y 6 " = T (Use filter fabric) 9 " = T (No filter fabric) d50 Stone size formula Where Y = Do d50 =0.0082 * q^1.33 = 0.12 Ft. 3 " STONE USED TW 1.00 Ft. = Y 6 " = T (Use filter fabric) 9 " = T (No filter fabric) Y = Depth of scour hole below culvert invert, T = Thickness of riprap L = 3 Do = 3.00 Ft.

= Depth of scour hole below culvert invert, T = Thickness of riprap L = 3 Do = 3.00 Ft. W = 2 Wo = 2.00 Ft. If Y = 1/2Do Total L = 6.00 , Total W = 5.00 If Y = Do Total L = 9.00 , Total W = 8.00 T = d50 Stone size x 2 if filter fabric is used T = d50 Stone size x 3 if no filter fabric is used STRUCTURE SCOUR 1 DESIGN SUMMARY FALSE Total L = 6' L= 3' TRUE Total W = 5' W= 2' FALSE Depth of scour hole (Y) = 0.5 ' FALSE d50 Stone size = 3" Thickness of riprap (T) = 6" L:\2024\12408\1240815\Reports-Calcs\Drainage Reports\SCOUR1 139 139