Design Commission Meeting #1 August 2010 · 2015. 1. 7. · Oak Lake –1897. SE corner of Midvale...
Transcript of Design Commission Meeting #1 August 2010 · 2015. 1. 7. · Oak Lake –1897. SE corner of Midvale...
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Design Commission Meeting #1
August 2010
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Study Area
Washelli Cemetery
Auro
ra A
ve
Northgate
N 107th St
Mid
vale
Ave N
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Oak Lake – 1897
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SE corner of Midvale & N 107t St
N 107th St between Midvale Ave N and Stone Ave N
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Intersection of Midvale & N 107th St
Daylight basement apartmentsOn Midvale south of N 107th St
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Alley between Stone & Midvale South of N 107th St
Condo parking garage off alley betweenStone & Midvale south of N 107th St
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Existing Conditions – Flood Prediction Map
Storm
10-yr25-yrDec 07N 107th St
Mid
vale
Ave N
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Cemetery
Northgate Way
Single Family
Cond
o/ A
pt
Condo
/ A
pt
Auro
ra
Ave
Top Soil
Storage Facility
Handy Andy
Maintenance Yard
Proposed Stormwater
Facility
N 107th
St
Mid
vale
A
ve N
Sto
ne
Ave N
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Initial Concept for Midvale Stormwater
Facility
Flat area grass w/ shrubs
Sloped area w/ shrubs
Mid
vale
Ave N
Sto
ne A
ve N
Stormwater Facility3 – 3.5 million gallons
Trees &sidewalk
Inlet/ outlet for
big storms
2:1 slope
Function: 2-3x / decade, facility will fill with up to 7-ft of water.
Existing storm drain
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Ashworth Pond- existing detention pond located ½ mile
north
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Ashworth Pond- existing detention pond located ½ mile
north
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Initial Concept for Midvale Stormwater
Facility
Flat area grass w/ shrubs
Sloped area w/ shrubs
Mid
vale
Ave N
Sto
ne A
ve N
Stormwater Facility3 – 3.5 million gallons
Trees &sidewalk
Inlet/ outlet for
big storms
2:1 slope
Function: ~1-2x / decade, facility will fill with up to 7-ft of water.
Holds flood water up to the “25-year storm”
Existing storm drain
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Improved Concept for Midvale Stormwater
Facility
Flat area grass w/ shrubs
Sloped area w/ shrubs
Shallow water
Deep water (3 ft)
Mid
vale
Ave N
Sto
ne A
ve N
Stormwater Facility3 – 3.5 million gallons
Trees &sidewalk
Inlet/ outlet for
big storms
2:1 slope
Function: ~1-2x / decade, facility will fill with up to 7-ft of water.
Facility will provide water quality treatment for most storm events.
Diversion & pretreatment
For low flows (small
storms)
Shelf
3:1 slope3:1 slope
Low flow outlet
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The stormwater pond could look something like this.
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Task 1Q 10 2Q 10 3Q 10 4Q 10 1Q 11 4Q 112Q 11 3Q 11
Property Purchase
Design
Construction
Advertise/award
Closeout
Midvale Detention Pond: conceptual schedule
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Property $5M
Design $300K
Construction (SPU) $200K
Contractor $3M
Contingency $1M
Total $9.8M
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Community view: Amenity or hazard?
Balance of detention and open space
Fencing
Adjacency to Aurora Ave and informal “transfer station”
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We don’t want this look.
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