Parkway Landscape Conversion Action Plan Presented to the - - PowerPoint PPT Presentation

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Parkway Landscape Conversion Action Plan Presented to the - - PowerPoint PPT Presentation

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Parkway Landscape Conversion Action Plan Presented to the Centennial Water & Sanitation District Board and Highlands Ranch Metro District Board October 29, 2018 Background Information Parkway Action Plan 2015 Challenging landscape

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Parkway Landscape Conversion Action Plan

Presented to the Centennial Water & Sanitation District Board and Highlands Ranch Metro District Board October 29, 2018

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Background Information

  • Parkway Action Plan 2015
  • Challenging landscape to maintain
  • Rising maintenance costs
  • Commitment from both organizations to conserve

resources and water

  • Meet PBB results by conserving natural resources

while providing attractive parkways

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Approach to Planning

  • Jointly funded plan
  • DHM Design
  • Project Team: Dirk Ambrose, Bob Claiborne,

Thomas Riggle, Brittany White, Carrie Ward

  • Inventory of perennial problem areas, maintenance

issues and water usage

  • Studied concepts for converting some parkway

landscape

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Goals & Objectives

  • 1. Reduce overall water and maintenance needs by

providing a more sustainable landscape and irrigation system.

  • 2. Maintain and enhance the existing aesthetics and

experience of the streetscape.

  • 3. Educate the community in the value of landscape

conversions.

  • 4. Create a realistic phasing plan which prioritizes

areas for conversion.

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Landscape Analysis

285 Acres Consisting of 8 Typical Landscapes:

  • Community entries
  • Neighborhood areas
  • Commercial areas
  • Medians
  • Parkways that intersect with open space
  • Narrow, medium and wide areas

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Landscape Strategies

  • Identified eight typical landscapes
  • Simple designs visible from vehicles
  • Unified design, consistent plans and materials
  • Areas to convert: narrow, steep, south facing
  • Areas adjacent to open space, parks and recreation

center frontages

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3 Types of Conversion Scenarios

  • Shrub Bed – consists of cobble stone, wood mulch,

shrubs and ornamental grasses (typically for narrow area applications)

  • Alternative Grass – a variety of lower water use

grasses intended to look more like long turf (typically used in large areas that are adjacent to bluegrass)

  • Native Grass – a variety of low water use grasses that

thrive in our dry climate (typically used in large areas that are adjacent to open space)

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Typical Landscape Concepts - Before

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Dad Clark Drive

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Broadway

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Foothills Canyon Boulevard

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Wildcat Reserve Parkway

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Highlands Ranch Parkway

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Highlands Ranch Parkway

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Plaza Drive

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Wildcat Reserve Parkway

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Wildcat Reserve Parkway

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Typical Landscape Concepts – After

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Typical Landscape Concepts – Before

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Colorado Boulevard

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Typical Landscape Concepts – After

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Annual Water & Maintenance Cost Per Acre

Landscape Options Water Use Water Cost Maintenance Total Cost Bluegrass 27” $2,683 $2,580 $5,263 Shrub Bed 15” $1,491 $2,580 $4,071 Alternative Grass 15” $1,491 $291 $1,782 Native Grass 10” $994 $291 $1,285

Water and Maintenance Costs

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Conversion Costs

  • Conversion Cost/turf:

$ .60/SF or $ 26,136/acre

  • Conversion Cost/shrub beds:

$4.00/SF or $174,240/acre*

(*Shrub beds are normally smaller)

Costs may vary depending on significant sprinkler system adjustments, increased initial watering and additional seeding efforts.

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South Broadway, Dad Clark Dr. to Northridge Rd. 30

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Cost Benefit Analysis Example

South Broadway, Dad Clark Dr. to Northridge Rd.

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Convert bluegrass to alternate turf - assume 15” of irrigation 96,574 SF 2.21/Ac. Conversion Cost (estimated $.60/SF) $57,944 Average Annual Water Cost Savings $2,634 Average Annual Maintenance Cost Savings $5,024 10-Year Water Savings (gallons) 7,201,241 Project Payback in Years 7.5

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Highlands Ranch Pkwy, White Oak to Deer Creek St. 32

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Cost Benefit Analysis Example

Highlands Ranch Pkwy, White Oak to Deer Creek St.

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Convert bluegrass to shrubs and mulch - assume 15” of irrigation 10,000 SF .23/Ac. Conversion Costs (estimated $4.00/ SF) $40,000 Average Annual Water Cost Savings $274 Average Annual Maintenance Cost Savings $478 10-Year Water Savings (gallons) 749,450 Project Payback in Years 53

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Highlands Ranch Pkwy, Open Space, both sides, east of Montclair St. 34

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Cost Benefit Analysis Example

Highlands Ranch Pkwy, Open Space, both sides, east of Montclair St.

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Convert bluegrass to native seed - assume 10” of irrigation 14,000 SF .32/Ac. Conversion Costs (estimated $.60/ SF) $8,400 Average Annual Water Cost Savings $540 Annual Maintenance Cost Savings $732 10-Year Water Savings (gallons) 1,477,177 Project Payback in Years 6.6

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Long Range Conversion Scenario

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Long Range Conversion Scenario Convert 1/3 of Parkway Landscape 95 Acres Acres Per Year 5 Acres Total Years 19 Years Cost Per Year $300-$400K Total cost / 19 Years $5,700,000 - $7,600,000

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Demonstration Project

University Avenue – Highlands Ranch High School

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Next Steps

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  • 2019 – demonstration project
  • Public information
  • Gather public input
  • Modify plan if needed
  • Boards adopt plan
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Questions & Comments

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