HomeMy WebLinkAbout2002-05-06 BRAA Email Re Drainage CalculationsKris Danielson
From: PosUer, Dennis M[d oom]
Sent: Monday, May 08.20025:30 PM
To: Mark Vierl|ng (E-mail); Kris Danielson (E-mail); Scott Richards (E-mail)
Cc' Kimberly Kamper (E-mail); Jay Johnson (E-mail); Judy Holst (E-mail); Jim Butler (E-mail);
Katherine D. Widi
Subject: Stillwater H.S. - draina calculations
In response to Item No. 7of Mark's 4/25/02 letter to Ms. India Boulton and
Mr. Jeffre Carpenter (addressin Para 12 of the CUP), we have reviewed FILE CO
the draina calculations for the Stillwater Hi School Stadium Y
Improvements as submitted b Anderson-Johnson Associates, Inc. These same
draina calculations were submitted to the Valle Branch Watershed District
and approved and permitted b VBWD on 3/28/02.
The drainage calculations are acceptable as submitted. The school proposes
to use two infiltration trenches and an infiltration basin on the west side
of the proposed home bleachers bz handle the increased rate of storm water
runoff basically not increasing the storm water runoff rate by more than 296
for the 2. 10. and 10O-yoar storm events. We would not normally consider
infiltration into our more conservative storm water runoff modeling if this
were tobea city-owned and maintained system, however, since these
improvements will be privately owned and maintained and have been approved
by the VBVVO. the proposed improvements are acceptable. The school will need
bo maintain these trenches and basin onan on-going basis boassure
infiltration iain fact occurring aamodeled.
Dennis As previousl noted, the visitors bleachers are proposed to be constructed
on top of an existin 15" storm sewer that is part of the school's privatel
owned and maintained football field/track storm sewer s This storm
sewer should probabl be relocated around the proposed bleachers to avoid
potential future maintenance issues.
K4.PosUer
Boneatroo Ander1k&Associates
2335 West Highway St. Paul, MN 55113
Direct: (651) 604-4815
Office: (851)836'4600
Fax: (651) 63G-1311
Cellular: (812) 865-8187
E-mail: dpostier@bonestroo.com