18067_Wurst Property_O_20160610

"A PEAK
Engineering & Design
June 10, 2016
Mr. Mike Deaton
Town of Apex Environmental Programs Manager
P.O. Box
Apex, NC 27502
P [phone]
Michael. Deatonggpexnc.org
Re: 810 Lufkin Road
Apex, NC
Peak Engineering & Design has completed the preliminary Storm Water Analysis for the
aforementioned project and has quantified the storm water requirements for the property in the
enclosed submittal. This analysis includes the pre and post development runoff from the site, the
10% confluence point downstream of the property and the overall project concept.
After review of the available data and preparation of the Minor Site Plan, the project has
been identified to not have any negative impacts on the downstream storm water infrastructure,
homes or businesses. The prevention of impacts to downstream stormwater will be accomplished
by an overall reduction of impervious surface on the property, approximately 2,664 sf.
Maintaining current drainage patterns and discharge rates. As a result, stormwater control devices
are not required. The property is approximately 16 acres. While the overall drainage area to the
onsite stream is approximately 290 acres. Showing the property to contribute approximately 5.5%
of the overall drainage area.
If you have any questions concerning the enclosed information, do not hesitate to contact
our office.
Sincerely,
a
Ii
Daniel H. Woods, P.E.
Peak Engineering & Design, PLLC
810 Lulkin Road —Apex, NC
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S448 Apex Peak\Nay 4368 II Apex. NC 27502
www.PeakEngineeringDesign.com

Page 1 of 2
ACME Planimeter
Measure areas using Google Maps!
Drag the map with
your mouse, or
double-click to center.
Click on the map to
place points.
The enclosed area is
shown below.
1.172e+6 m2 / 117.2 hectares / 1.172 km2 / 1.261 e+7 ft2 / 289.6 acres / 0.4525 mile
http://acme.com/planimeter/ 6/ 1 /2016

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
12 inch Driveway Crossing Pipe
Circular
Diameter (ft) = 1.00
Invert Elev (ft) = 413.02
Slope (%) = 1.37
N-Value = 0.013
Calculations
Compute by: Known Q
Known Q (cfs) = 2.90
414.50
414.00
413.50
413.00
412.50
1
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Section
2
Friday, Jun 10 2016
= 0.62
= 2.900
= 0.51
= 5.66
= 1.81
= 0.73
= 0.97
= 1.12
Depth (ft)
.98
1.48
Kim
0.48
-0.02
-0.52
3
Reach (ft)