energy public running water: effective stormwater quality practices tracy warner, municipal engineer...
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energy
PUBLIC
Running Water: Effective Stormwater Quality Practices
Tracy Warner, Municipal Engineer for Ames, IAJosh Shields, Landscape Architect with Bolton & Menk, Inc.Matt Ferrier, Civil Engineer with Bolton & Menk, Inc.
reduce
LONGEVITY
ENVIRONMENT
BIORETENTION
HEALTH
PARTNERSHIPS
ACCOUNTABILITY
PERMEABLELOCAL
SMART GROWTH
stormwater
COMMUNITIES
ecological
qualitywater quality
practices
social
educationefficiency
rain gardens
soil quality restoration
Community Flooding [2010]
Traditional Stormwater Model
Collect + Move runoff as fast as possible
Curb and gutter systems collect + transport runoff quickly + effectively to receiving streams
Out of sight → out of mind
Urban Runoff Toxicity Solids Oxygen-demanding substances Nitrogen and Phosphorus Pathogens Petroleum hydrocarbons Metals Synthetic organics
Increased runoff velocities Increased erosion Decreased Aquatic Wildlife Habitat
Traditional Stormwater Model
Public Perception Native plants look ‘weedy’ Not as manicured as lawn Attract insects and snakes How do you maintain it?
+ Which plants are native? Installation costs are expensive
Factors Impacting Lack of Change
Municipal Concerns Long-term Maintenance requirements New & Innovative → Unknown Best Management Practices (BMPs) may
fall outside of current City Codes Hard to accommodate installation &
enforce long-term function/look
Factors Impacting Lack of Change
Existing Site Conditions
City Hall Campus Project | Impervious Surface
5th Street
6th Street
Gra
nd A
venu
e
Clar
k Av
enue
Existing Site Conditions
City Hall Campus Project | Lawn/Landscape Surface
5th Street
6th Street
Gra
nd A
venu
e
Clar
k Av
enue
Modeling the Way [social]
Provide Examples for Developers Provides Examples for Property Owners Opportunity to monitor various BMPs Public Education
Showcase Ames Post-Construction Stormwater Ordinance Iowa Stormwater Management Manual Retain more runoff on site Treat runoff prior to release Consider pre-settlement conditions during
Design
Modeling the Way [technical]
Channel Protection 1 year 24 hour event: 2.67” Release at pre-development rate Must detain for minimum 24 hour period
Water Quality Protection 1.25” storm event 90% of storm events are less than this “first flush” Treat + Retain on site
Modeling the Way [technical]
Overbank Flood Protection 5 year 24 hour event: 3.81” Restrict post-development peak
discharge rate
Extreme Flood Protection 10 year 24 hour event: 4.46” 100 year 24 hour event: 7.12” Provide safe conveyance of excess runoff
Modeling the Way [technical]
City Hall Campus sub-Watersheds
Master Plan Concept
Best Management Practices
Low-Grow Native Turf + Soil Quality Restoration
Native Plantings+ Soil Quality Restoration
Native Seeding+ Soil Quality Restoration
Best Management Practices
Permeable Paving Bioretention Basin Soil Quality Restoration + Reinforced Native Turf
Stormwater Calculations
Landscape Codes Update to include BMPs
Consider relation to adjacent parking lots and streets
Require sustainability accommodations
Effects on existing infrastructure Pavement condition and retrofits
Subsurface drainage
Existing stormwater pipes
Internal Discussions [design]
Iowa Dept. of Agriculture & Land Stewardship (IDALS) City received an Urban Water Quality Demonstration
Project Grant for $100,000
Iowa State Revolving Fund (SRF) ~ sponsored projects City could receive up to $374,441 from eligible projects
City General Fund City obligated $500,000 towards reconstruction of the
West Parking Lot
Funding Opportunities
West Parking Lot Non-BMPs: $383,520.00 West Parking Lot BMPs: $526,101.50 West Parking Lot Bioretention Cell: $123,185.00 East Clark BMP: $51,966.00 West Clark BMPs: $88,525.00 North Lawn BMPs: $9,372.00 South Lawn BMPs: $16,297.00 Total : $1.2Million
IDALS $100,000.00 SRF $374,441.00 City General Fund: $500,000.00
Overall Cost Breakdown
Thank You [contact information]
Tracy Warner, PECity of Ames Municipal Engineer(515) [email protected]
Visit cityofames.org for more information on the City of Ames’ efforts toward greater sustainability
Josh Shields, PLABolton & Menk, Inc.Landscape Architect(515) [email protected]
Visit bolton-menk.com for more information on Bolton & Menk and our Municipal & Landscape Architecture Services
Matt Ferrier, PEBolton & Menk, Inc.Civil Engineer(515) [email protected]
Visit bolton-menk.com for more information on Bolton & Menk and our Municipal Services