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− | Large-scale projects require significantly more effort, budget,
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− | and staff than small-scale projects. Large-scale LID retrofits
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− | include:
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− | * Bioretention
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− | * Enhanced grass swales
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− | * Bioswales
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− | * Perforated pipe systems
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− | * Permeable pavement
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− | * Soakaways
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− | * Infiltration chambers
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− | * Rainwater harvesting (excluding rain barrels)
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− | * Prefabricated modules
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− | * Green roofs
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− | Consider a large-scale project if your municipality or
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− | department would like to be a leader in sustainability. Large-scale
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− | projects are often highly visible and attract more public
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− | attention. Large-scale projects may also be the only solution
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− | to site-specific challenges. For example, if site infrastructure
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− | is at risk as a result of urban flooding, LID practices that detain
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− | large volumes of runoff and encourage infiltration are the
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− | most viable LID options.
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− | Before starting a large-scale retrofit project, consider the
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− | following distinctions that set these retrofits apart from small-scale
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− | projects.
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− | ===Integration with capital works programs===
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− | Most large-scale LID retrofits must function with existing
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− | site infrastructure, such as storm sewers, catch basins,
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− | and pavement systems. The construction of large-scale
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− | LID practices often requires these systems to be removed,
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− | exposed, or replaced. The best time for this type of project to
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− | occur is when an infrastructure replacement or rehabilitation
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− | project is already planned.
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− | When LID retrofits are worked into other construction
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− | projects, such as parking lot repaving, or grading or drainage
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− | improvements, there can be substantial cost savings.
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− | Whether big or small, every municipality spends relatively
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− | large sums of money and substantial time planning for
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− | major capital projects. This includes redevelopment of public
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− | building and spaces. Many communities who have undertaken
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− | retrofits recognize that even if a relatively small portion of the
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− | project funds goes towards LID retrofits, they can retrofit large
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− | impervious surfaces and avoid new stormwater management
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− | infrastructure projects17.
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− | Municipal facility rehabilitation is typically forecast well in
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− | advance of the project. Parking lot paving is typically worked
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− | into municipal budgets based on expected life cycle and
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− | observed wear. As such, funds may be set aside prior to
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− | the project planning phases. Long-term forecast budgets
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− | may also be available for site revitalizations or expansions.
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− | These budget forecasts provide opportunities to compare the
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− | capital and life-cycle costs and benefits of the conventional
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− | construction project and LID retrofit.
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| [[Category:Planning]] | | [[Category:Planning]] |