Balancing Nature & Neighborhood

Balancing Nature & Neighborhood 1

Design Process • Final Concept Design • Site • Visit Base map • Brainstorm • Establish priorities • Goals • Design • details • Final Concept Design • Review • Requirements Balance of professionals Landscape Architects Civil Engineers

Existing Residential Neighborhood • 17 residences and only14 driveways • Unrestricted on-street parking for a total of 39 +/- spaces • The road is crowned with a single low point • Existing trees do not form a consistent tree canopy

Existing Parking Zoning Requirements Single family dwellings: 1 space/ residence Existing Parking: 14 Driveway Spaces: 14 spaces On Street Spaces: 39 spaces Total Spaces: 53 spaces Existing Parking Ratio: 3.1 spaces/ residence

LID Strategies Our team explored a variety of LID techniques before determining the best LID measures that seemed fitting for the existing conditions of this neighborhood. These included: Decrease impervious area Converting pavement into bio-retention areas Use pervious pavement Reduce traditional storm water infrastructure Encourage parking in existing paved areas Use of native/ adapted plants Use decentralized LID’s

LID Strategies

LID StrategiesSite Plan Proposed Parking: 14 Driveway Spaces: 14 spaces On Street Spaces: 30 spaces Total Spaces: 44 spaces Proposed Parking Ratio: 2.6 spaces/ residence Loss of 9 on-street parking spaces Zoning Rqmt : 1 space/residence Existing Parking: 14 Driveway Spaces: 14 spaces On Street Spaces: 39 spaces Total Spaces: 53 spaces Existing Parking Ratio: 3.1 spaces/ residence

LID StrategiesLandscape Plan Overhead power lines on North side of street Use of small to medium street trees Uniform street tree canopy to compliment existing trees

Landscape Palette • Liquidamberstyraciflua ‘Rotundiloba’ • (RotundilobaSweetgum) • Betulanigra • (River Birch) • Red Maple • (Acer rubrum) • Nyssa sylvatica • (Black Tupelo) • Gleditsiatriacanthosinermis ‘Imperial’ • (Imperial Honeylocust) • Myricapensylvanica • (Northern Bayberry) • Clethraalnifolia ‘Hummingbird’ • (Sweet Pepperbush) • Ilex glabra ‘Shamrock’ (Shamrock Inkberry) • Ilex verticillata ‘Nana’ • (Red Sprite Winterberry) • Spireaetomentosa • (Steeplebush) Native, low maintenance, and durable in urban and bioretention environments • Eupatorium fistulosum • (Joe Pye Weed) • Phlox stolonifera • (Creeping Phlox) • Aster divaricatus • (Dwarf Aster) • Deschampsiacaespitosa • (Tufted Hairgrass) • Iris versicolor • (Harlequin Blueflag)

Balancing Nature & Neighborhood • Using Stormwater to provide Neighborhood character • Attractive and native landscaping • Interconnected LID practices

LID StrategiesBioretention Planting

LID Strategies Bioretention

LID Strategies Pervious Pavement The Green Roadway converts asphalt into pervious pavement. Bioretention planters are used in series and interconnected through an underdrain system.

LID Strategies SWM (Quantity Control) • Highlights • No reliance on infiltration, applicable to any soil condition • No Adjusted/ reduced Curve Numbers due to pervious pavement or runoff reduction • No Flooding: 100-YR Runoff is contained within LID practices

LID Strategies SWM (Quality Control) Summary • Highlights • 90% Phosphorus removal • Approach utilized Runoff Reduction Methodology • Phosphorus and Nitrogen reductions helps meet Bay TMDLs

Cost Analysis • Highlights • Conventional Cost assumed use of a conventional sand filter for Quality Control and an underground concrete vault for Quantity Control. • Conventional Cost resulted in additional cost for pavement and storm drainage systems • LID Design resulted in increased costs for curbing and landscaping. The LID Design resulted in savings of $125K for 715LF of roadway construction.

Conclusion • innovative design, real world solution through interconnected decentralized facilities • Enhanced quality of life through landscaping • mimics natural hydrologic function of the site and will help meet Bay TMDL’s • lower construction costs compared to conventional design

Balancing Nature & Neighborhood