HomeMy WebLinkAbout2001-09-05 Revised Drainage CalculationsDRAINAGE CALCULATIONS
OAK PARK HEIGIVFS, MN
36 & OSGOOD AVENUE
WALGREEN
REVISED
September 5, 2001
's SITE
p o r 07 - 4ii
LANDF oRM
MINNEAPOLIS PHOENIX
510 FIRST AVENUE NORTH, SUITE 650, MINNEAPOLIS, MN 55403 (612) 252-9070 FAX/DATA: (612) 252-9077
SD01025 August 24, 2001
Drainage Analysis & Storm Sewer Narrative
Landforin
510 First Ave. N. Suite 650, p is, AIIN 55403
(612) 252 -9070 * Fax (612) 252 -9077
Oak Park Heights — Walgreen's
The existing condition of the site is a funeral home with bituminous parking.
Approximately 60% of the site (with 40% impervious area) drains to the east off the
property into a drainage ditch that Bows to the south. This storm water runoff continues
south through storm sewer culverts under State Highway No. 36. The other 40% of the
site (with 82% impervious area) drains to the south into the State Highway No. 36 Right -
of Way. Currently, there is no water quantity or quality ponding on the site. There is an
existing 18" storm sewer pipe that runs across the middle of the site from west to east and
connects to a 30" storm pipe that flows south. The 30" storm pipe system runs south of
the site and eventually outlets to a regional storm water treatment pond referred to as
Pere it Pond. This storm pipe system collects storm water run -off from a portion of the
adjacent roadway, Osgood Avenue North (CSAH 24). It appears the 18" storm sewer
pipe is not located within a drainage and utility easement.
The proposed site redevelopment includes collection of the on -site impervious and
pervious runoff with concrete curb and gutter, catch basins, and storm sewer pipe. The
sites overall drainage pattern will be revised to direct the on -site run -off into the existing
storm sewer system described above that currently runs across the middle of the site. The
18" storm sewer pipe is currently located underneath the proposed building, therefore this
existing pipe will be rerouted to the south of the proposed Walgreen's building. Due to
the tight constraints of the site, on -site ponding is not feasible. To provide best
management practices, an in -line storm water treatment structure (V2B 1) will be
provided at the end of our on -site storm sewer system prior to connection into the
existing 30" storm sewer system described above. The appropriate calculations are
attached.
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650 BUTLER NORTH BUILDING
510 FIRST AVENUE NORTH
PHONE: 612.252.9070 FAX: 612.252.9077
Date: 9/5/01