HomeMy WebLinkAboutSDP200600016 Calculations 2006-02-13STORMWATER MANAGEMENT SUMMARY
for
BOB EVANS RESTAURANT
Charlottesville, VA
February 13, 2006
CONTEXT
The site is a 1.13 -ac. parcel located on the west side of Route 29 North, south of Timberwood
Blvd., north of the Target store in Charlottesville, Virginia. The on -site drainage system will collect the
runoff and convey it to the existing thirty- six -inch storm sewer at the northeast corner of the site.
TIME OF CONCENTRATION (Tc)
The storm system was designed based on a minimum time of concentration of 10 minutes.
WEIGHTED RUN -OFF COEFFICENT (C)
A weighted coefficient of 0.87 has been calculated for the proposed conditions. A value of 0.90
was used for the impervious areas, which comprises ninety -four percent (94 %) of the site. A value of 0.30
was used for the pervious areas which constitutes the remaining six percent (6 %) of the site. See sheet Cl
for specific locations of various surfaces.
STORMWATER MANAGEMENT /DETENTION REQUIREMENTS
It is our understanding that the stormwater management requirements for this site have been
provided by the Hollymead Town center stormwater management facility located northeast of this site,
designed by Rivanna Engineering & Surveying, PLC.
WATER QUALITY REQUIREMENTS
It is our understanding that the water quality requirements for this site have also been provided by
the Hollymead Town center overall development.
STORM SEWER DESIGN
The on -site storm sewer has been designed to convey a 10 -year design storm. The rainfall intensity
was obtained from the Hydrologic/hydraulic calculations for the Hollymead Town center SWM1. This
sewer system consists of a network of catch basins connected by twelve -inch pipes, which will convey the
runoff to the existing thirty -six -inch storm sewer at the northeast corner of the site.
SUMMARY
As indicated above and shown by the attached calculations, the stormwater management, water
quality, and hydraulic pipe calculations are in substantial compliance with the storm drainage requirements
of Albemarle County.
R: \03\26 \12656 \stm calc \Storm Water Management Report.doc
4111111/MN imannsmmartmormommarati
4,
sheet 1 /
date 1/0madeby1 —
ms consultants inc Iluom .:11111,
MHO !': : ti checked date
engineers, architects, planners
office L. I US, OH
r i1 AL0 ifproject41
SC 5 f --
t1_4
c
c LA
c (? is-0 .6,6
Q 6 - 1 S
A r.PA 4-i00 e?3" 4c
C- d 90
S ' ' /
t
O. ('-? /5 (0 os)
L. LI. 3