mitchell block: low-impact development case study

MITCHELL BLOCK

Fort Collins, Colorado

LOW-IMPACT DEVELOPMENT

URBAN INFILL REDEVELOPMENT – MOUNTAIN & WALNUT

PERMEABLE PAVERS – BASS™ INSTALLATION

fully lined with 30-mil PVC impermeable membrane


perforated PVC underdrain…


…runs along entire paver section


similar sub-base course as Odell’s


similar base course as Odell’s


similar bedding course as Odell’s


same manual method of installation


same herringbone pattern, but with perimeter header


void filler brushed into place with a broom


finished product – Mountain Avenue

PERMEABLE PAVERS – UDFCD INSTALLATION

begins with demo and removal of existing asphalt


Urban Drainage uses more of a sand filter system


this section also lined with 30-mil PVC membrane and has perf. underdrain


note the difference between the sand versus the large aggregate


finished product – Walnut Street

FILTERRA BIORETENTION SYSTEM

manufactured unit delivered and craned into place


similar to an on-grade Type R inlet with a tree grate out of the top


trash and large debris collect on top of planting media

CSU URBAN WATER CENTER – RESEARCH PARTNERSHIP

water quality monitoring system installed at sump inlet

CSU URBAN WATER CENTER – RESEARCH PARTNERSHIP

samples taken from paver section only, Filterra by-passes

URBAN RAIN GARDENS

rain garden flanks sump inlet at corner of Walnut Street

URBAN RAIN GARDENS

curb cuts allow water to enter rain garden at both ends

URBAN RAIN GARDENS

on-grade rain garden further west on Walnut Street

URBAN RAIN GARDENS

overflow weir controls the on-grade rain garden

SPECIAL THANKS

Contributing Photographers:

Herman Feissner – Feissner Consulting

Basil Hamdan – City of Fort Collins

Cody Snowdon – Northern Engineering

Project Team:

Bohemian Foundation

Everitt-MacMillan Development

Neenan Company

BHA Design

City of Fort Collins Utilities

CSU Urban Water Center