HomeMy WebLinkAboutAurora-SnowStorageMemomemo
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TO: Matt Ekstrom, PE
FROM: Christopher Michael
DATE: 03/23/2022
JOB NO.: 5755.008
RE: Snow Storage – Aurora
CC:
Urgent For Review Please Comment Please Reply For Your Use
This memo presents technical data for the snow storage plan at the Aurora development site located in
MSU Innovation Campus. The following design parameters were used to develop a snow storage plan:
• A snow depth of 2 feet across the asphalt parking area for a snow volume.
• Snow storage piles may be stacked maximum 8 feet high, with 2:1 side slopes.
• A total of 80,654 SF of parking area (this is the total asphalt area, including drive aisles and parking
stalls) that will require snow removal into storage piles.
• The proposed snow storage piles will have a total footprint of approximately 25,350 sq. ft.
(Table 1).
In addition to the City of Bozeman recommendations, an in-house analysis was conducted to arrive at a
“compaction factor.” The compaction factor approximates the percent compaction the snow receives as
plows remove it from its original state. On January 30, 2018, Bozeman, MT received several inches of new
snow as temperatures dipped into the teens overnight. The following day, measurements were taken of
the weight of loosely placed snow in an empty 6” x 12” cylinder. The weight of compacted snow was also
recorded, and done so by placing (3) lifts of loose snow and compacting each lift. It was observed by (3)
separate trials that loose snow was approximately 40% the weight of the well-compacted snow in this
controlled environment. Thus, it was concluded that loose snow compacts to about 40% of its original
volume, or the compaction factor is approximately 60%.
Using a snow depth of 2 feet across the asphalt area, it is anticipated that a total of 161,308 cubic feet of
snow will need to be removed. Using the compaction factor of 60%, this volume reduces to 64,523 cubic
feet (total required snow storage volume).
Table 1 summarizes how the volume of removed snow for the site will easily be stored in trapezoidal-
shaped snow storage piles as shown on the attached Exhibit 1. Proposed storage piles are generally
located within parking islands and parking bays and are clear of public rights-of-way and outside of vision
triangles.
Snow Storage – Aurora
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Asphalt Area
(SF)
Total Snow
(CF)
Req'd Snow Storage (40%)
(CF)
80,654 161,308 64,523
*Volume calculation based on a 2’ snow depth across all paved areas.
Table 1: Required Snow Storage Volumes
Pile
Number
Base Area
(SF)
Available Volume
(CF)
Aurora
A1 800 2,000
A2 1,210 3,640
A3 2,640 7,950
A4 1,800 10,100
A5 5,000 12,500
A6 1,700 9,520
A7 1,750 1,780
A8 1,300 1,290
A9 1,300 1,290
A10 1,300 1,290
A11 650 1,450
A12 250 560
A13 250 560
A14 250 560
A15 430 980
A16 2,800 8,420
A17 1920 5,760
SUBTOTAL 25,350 69,650
*Volume calculation based on trapezoidal shape with 2:1 side slopes and a maximum height of 8’
Table 2: Snow Storage Volume Calculation
As shown in the tables above, the available snow storage volume (69,650 CF) is adequate to accommodate
the total required storage volume of 64,523 cubic feet.
This design approach is a conservative estimate of how much snow storage volume is required because it
does not implement other obvious factors that will affect snow storage volume. Storage piles will
inevitably be subject to freezing and thawing cycles. During these cycles, storage piles will be reduced by
percolation, sublimation, and evaporation. The required snow storage volume will also be affected due to
vehicles in the parking area prohibiting the removal of all the snow. These factors were not taken into
account in our required volume calculations.
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BP12SD 12SD12SD12SD15SD15SD15SD15SD15SD15SD15SD15SD15SD15SD15SD15SD15SD15SDTSNOW STORAGE AREATOTAL ASPHALT AREA: 80,654 SFREQ'D SNOW STORAGE: 64,523 CFA1A2A3A4A5A6A7A8A9A10A11A12A13A15A14A16A17issue dateproject #phasesheet
project
ownerrevisiondate2/24/2022 1:56:20 PM
C1.15755.008-SITEPLAN_C1.1 -
TEMPLATE
21087.00NOT FORCONSTRUCTIONAURORA TECHNOLOGIES
INNOVATION CAMPUS PARTNERS
N:\5755\008-Aurora\ACAD\Exhibits\5755.008-SNOW_STORAGE_EXHIBIT.dwg
engineers surveyors planners scientists
MorrisonMaierle 10/22/2021