HomeMy WebLinkAboutDrainage Reports - 02/09/2016Tyre
• M�e�511 J.
J G�OU?
February 9, 2015
Dan Mogen
Water Utilities Engineering
City of Fort Collins
281 N. College Avenue
Fort Collins, Colorado 80524
City of FoA Collins
Approved by
Date: 2/9 / Z01 c.
RE: Drainage Compliance
Minor Amendment
Lot 1, Centre for Advanced Technology P.U.D., Tenth Filing
1013 Centre Avenue, Fort Collins, Colorado
Plans
Lot 1, Centre for Advanced Technology P.U.D.:Tenth Filing is planned for a minor amendment in the
redevelopment of a 2,380 square -foot convenience store with fuel canopy into a MOD Pizza restaurant.
The intent for the site work involved with this redevelopment is to work with existing pavement and
grading to the maximum extent possible. The redevelopment will not modify the building footprint or
finished floor elevation, which will allow for minor modifications to the parking lot configuration (once the
fuel canopy and storage tanks are removed) without affecting on -site grading or drainage patterns.
Drainage for the current site entirely sheefflows from northwest to southeast, eventually being captured
into a concrete drainage swale which routes stormwater toward the existing detention pond located
south of Lot 3: The attached exhibit shows the intent of the proposed redesign of the site, including the
extent of areas which will switch from paved to landscaped and from landscaped to paved. The
proposed site work will result in a net increase in landscaped (pervious) area.
Drainage patterns will be unchanged from the current condition. Stormwater will sheetflow toward the
southeast corner of the site where it will be routed through a curb chase and released toward the
existing concrete drainage swale. Stormwater drainage from the southwest portion of the parking lot
will be encouraged to pass through small curb cuts and into a grass -lined swale before exiting the site,
providing 4,775 square feet of disconnected imperviousness stormwater quality enhancements over the
current condition. The grass -lined swale slopes at just under 1 percent and will be constructed with 18-
inch-thick peat/sand media to promote infiltration.
In conclusion, the redevelopment of this site will reduce net imperviousness and provide stormwater
quality enhancements, while minimizing disturbance during construction by maintaining existing grades
and utilizing existing pavement where practical. If you wish to discuss this proposed redevelopment
further regarding stormwater design, please do not hesitate to call.
Sincerely, �9fl
Chad A. \
Regional
720.536.3180
www.dimensiongrp.com
5600 S. Quebec St., Suite 310B, Greenwood Village, CO, 80111
ARCHITECTURE • CIVIL ENGINEERING • MEP ENGINEERING • PLANNING
CENTRE AVENUj T �\
(—R.O.W. VA51M
— — — — — \
Cn
Cn
b m
m-.-I
Cn
-hj I I I
I � � LOT 1 // � IFLoW
' /j LOT 3
can I II bIRE/ ix Flow. Aj
la n I \
I II ::• / :::; ::
I i t o Ro DISCONNECTED IMPERVIOUS I l
w AREA ROUTED TO SWALE I I�
4,775 SF \
FLOW z
FLOW < ...
W. CURB CHASE M %�
CU_RB CUT CURB CUT — — —
witGRASS SWALE
EXISTING
DETENTION POND
I LOT 2
I / EXISTING CONCRETE
/ DRAINAGE SWALE
I ,c
LANDSCAPED AREA
BECOMING PAVED AREA
PAVED AREA BECOMING
LANDSCAPED AREA
Lot Size
(FT2)
Landscape Area
(FT2)
Paved Area
(FT2)
Roof Area
(FT2)
Existing
29,768
9,571
17,817
2,380
Proposed
29,768
10,531
16,857
2,380
Difference
0
960
-960
0
IN
GRAPHIC SCALE
0 15 30
1 INCH = 30 FEET
DRAINAGE PLAN
MOD PIZZA AT CENTRE & SHIELDS
FORT COLLINS, COLORADO
Awtouep-T
ARCHITECTURE • CIVIL ENGINEERING - MEP ENGINEERING • PLANNING
5500 5. Guebe SheN, Sulle 3108, Green d VBepe, ColooE080111
ML 720.538.3180 xxw.gmenalonOm mm