SvR High Point presentation

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Information about SvR High Point presentation

Published on November 21, 2007

Author: ncormier

Source: slideshare.net

Description

A presentation by SvR on the natural drainage system and green infrastructure aspects of the High Point redevelopment.

Civil Engineering Landscape Architecture Environmental Restoration Planning High Point Redevelopment & Natural Drainage System Kathryn Gwilym, PE, LEED ® AP Tom von Schrader, PE, LEED ® AP

High Point Revitalization Project Developer: Seattle Housing Authority 120-acre mixed income housing redevelopment 34 blocks of new streets with new utilities, street trees, sidewalks, parks and open space Up to 1,600 housing units, neighborhood center, library and mixed-use block Mithun Architects + Planners High Point Prior to Redevelopment Density ranges from 16 to 30 units/acre of ground-related housing

Developer: Seattle Housing Authority

120-acre mixed income housing redevelopment

34 blocks of new streets with new utilities, street trees, sidewalks, parks and open space

Up to 1,600 housing units, neighborhood center, library and mixed-use block

Density ranges from 16 to 30 units/acre of ground-related housing

Priority Watershed- Longfellow Creek High Point Subbasin: 8% of Longfellow Creek Watershed High-priority, salmon-bearing watershed that has been identified by “the community and the City as a significant and valuable resource” (Seattle Public Utilities) Urban Watershed that drains to Puget Sound Longfellow Creek Longfellow Creek watershed High Point basin

High Point Subbasin: 8% of Longfellow Creek Watershed

High-priority, salmon-bearing watershed that has been identified by “the community and the City as a significant and valuable resource” (Seattle Public Utilities)

Urban Watershed that drains to Puget Sound

Natural Drainage System (NDS) Strategies – where we started in 2002 Partnership of Seattle Housing Authority & Seattle Public Utilities Design Charrette with City Departments Vegetated, shallow grass and grass conveyance swales along 15,000 lf streets Traditional storm drain conveyance pipe for large storm events Stormwater pond for Flood Control Reduce Impervious Surfacing Disperse Runoff at Source

Partnership of Seattle Housing Authority & Seattle Public Utilities

Design Charrette with City Departments

Vegetated, shallow grass and grass conveyance swales along 15,000 lf streets

Traditional storm drain conveyance pipe for large storm events

Stormwater pond for Flood Control

Reduce Impervious Surfacing

Disperse Runoff at Source

Drainage Criteria & Goals for High Point Water quality treatment: 6 month Seattle storm Conveyance sizing for 25-year Seattle storm Peak flow control for 2, 25 and 100 year Seattle storm events Conveyance of dam safety flows downstream of stormwater pond NDS combined with the stormwater pond detain and match duration up to the 2 year , 24-hour storm assuming pasture conditions

Water quality treatment: 6 month Seattle storm

Conveyance sizing for 25-year Seattle storm

Peak flow control for 2, 25 and 100 year Seattle storm events

Conveyance of dam safety flows downstream of stormwater pond

NDS combined with the stormwater pond detain and match duration up to the 2 year , 24-hour storm assuming pasture conditions

Challenges for Developing Street Section: Having space for all users & infrastructure in ROW ↑ Drainage Swale Concept ↑ Electrical & Franchise Utilities

ROW Street Section with NDS Swale The cross sections for the NDS swales were developed through discussions with various City of Seattle departments (decisions by inches) Street widths: 25 feet/56 right of way; 28 feet/56 ft rw; 32 feet/60 ft rw Curb height, swale width, street tree locations, berm locations, side slopes, bottom width, etc. were established Porous sidewalks on the swale side

The cross sections for the NDS swales were developed through discussions with various City of Seattle departments (decisions by inches)

Street widths: 25 feet/56 right of way; 28 feet/56 ft rw; 32 feet/60 ft rw

Curb height, swale width, street tree locations, berm locations, side slopes, bottom width, etc. were established

Porous sidewalks on the swale side

Developing Cross Section & Swale Length in ROW Vegetated swale 5’+/- compost gravelly soil 18” deep, 10” ponding Grass-lined swale 5’ +/- compost gravelly soil 8” deep, 2” ponding

Vegetated swale

5’+/- compost gravelly soil

18” deep, 10” ponding

Grass-lined swale

5’ +/- compost gravelly soil

8” deep, 2” ponding

High Point Swales Vegetated Grass-lined Conveyance Amended soils

Vegetated

Grass-lined

Conveyance

Amended soils

Seattle Public Utilities’ First Public Porous Cement Concrete Pavement Street at 32 nd Ave SW Integration between redevelopment and adjacent single family neighborhood Road: 8” porous concrete over 18” gravel storage subbase Collaboration between suppliers, designers, City Inspectors, Contractors, Neighbors and Seattle Housing Authority Being Monitored by Seattle Public Utilities

Integration between redevelopment and adjacent single family neighborhood

Road: 8” porous concrete over 18” gravel storage subbase

Collaboration between suppliers, designers, City Inspectors, Contractors, Neighbors and Seattle Housing Authority

Being Monitored by Seattle Public Utilities

32nd Avenue SW Porous Cement Concrete Street Prior to Construction Post Construction Placing Concrete

Natural Drainage Strategies – Housing Block-level Design High Point Drainage Technical Standards and requirements for each lot per the plat Examples of Methods to use: Porous pavement Conveyance furrow Dispersal trench Rain garden Pop-up emitter Downspout Disconnect Reduce Impervious footprint

High Point Drainage Technical Standards and requirements for each lot per the plat

Examples of Methods to use:

Porous pavement

Conveyance furrow

Dispersal trench

Rain garden

Pop-up emitter

Downspout Disconnect

Reduce Impervious footprint

Housing Sites Drainage Dispersion, Splashblocks, Rain Gardens & Art Splash Blocks by Myersculpture

Stormwater Pond Receives 130 acres of run-off Flow control for 100-year storm event Water Quality Treatment in combination with NDS swales Depth 15.5’, Storage 22 ac-ft Dam Safety Park Amenity & Art

Receives 130 acres of run-off

Flow control for 100-year storm event

Water Quality Treatment in combination with NDS swales

Depth 15.5’, Storage 22 ac-ft

Dam Safety

Park Amenity & Art

How High Point Works & Informing the Community

High Point has … proven installations that are now being applied across the country Low Impact Design/Site Drainage Technical Standards Reduced impervious footprints Mature tree protection techniques Site fully integrated with Low Impact Development techniques Reduced road widths Site-wide pedestrian circulation and safety enhancements Use of porous paving applications for walks, road and parking lots

… proven installations that are now being applied across the country

Low Impact Design/Site Drainage Technical Standards

Reduced impervious footprints

Mature tree protection techniques

Site fully integrated with Low Impact Development techniques

Reduced road widths

Site-wide pedestrian circulation and safety enhancements

Use of porous paving applications for walks, road and parking lots

High Point has … proven installations that are now being applied across the country Multifunctional stormwater park Menu driven low impact development approach Defined permitting review process Interagency collaboration Community education Resident education Maintenance and operation standards Art integration Aesthetic treatment of drainage swales Sandblasting by Myersculpture

… proven installations that are now being applied across the country

Multifunctional stormwater park

Menu driven low impact development approach

Defined permitting review process

Interagency collaboration

Community education

Resident education

Maintenance and operation standards

Art integration

Aesthetic treatment of drainage swales

Recognition: Seattle Housing Authority Seattle Public Utilities Other agencies: Washington State Department of Ecology US Department of HUD Seattle Department of Planning and Development Seattle Department of Transportation Seattle City Light Seattle Parks Department Artist: Myers Sculpture For more information: www.svrdesign.com and www.seattle.gov/util/naturalsystems Seattle Public Utilities had a vision for a neighborhood with a naturalistic drainage approach. Seattle Housing Authority had a vision for a diverse, sustainable neighborhood. These two public agencies have worked hard to implement these visions. Consultants: SvR Design Company Mithun Architects and Planners Resource consultants: Shannon and Wilson RW Beck & Herrera Nakano Associates Stoneway Concrete Cedar Grove Composting NW ACPA Ph I Natural Drainage System Contractors: Gary Merlino Construction T. Yorozu Gardening Co. Absher Construction Fardig Ph II Natural Drainage System Contractors: Tri-State Construction Inc. T. Yorozu Gardening Co.

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