City of Redding City of Redding M M Municipal Utilities - - PowerPoint PPT Presentation

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Aug 20, 2023 164 likes •376 views

City of Redding City of Redding M M Municipal Utilities Municipal Utilities i i i i l Utiliti l Utiliti What is Low Impact Development What is Low Impact Development What is Low Impact Development What is Low Impact Development Low

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City of Redding City of Redding

M i i l Utiliti M i i l Utiliti Municipal Utilities Municipal Utilities

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What is Low Impact Development What is Low Impact Development What is Low Impact Development What is Low Impact Development

Low Impact Development (LID)

A comprehensive technology

A comprehensive technology-

based approach

based approach to managing urban stormwater to managing urban stormwater to managing urban stormwater. to managing urban stormwater.

It combines a hydrologically functional site

It combines a hydrologically functional site d i i h ll i i d i i h ll i i design with pollution prevention measures to design with pollution prevention measures to compensate for land development impacts on compensate for land development impacts on h d l d li h d l d li hydrology and water quality. hydrology and water quality.

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Formula for Low Impact Formula for Low Impact Development Development LID = engineering + hydrology + ecology + ecology + land use planning p g

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Types of Low Impact Development Types of Low Impact Development

Rain Garden Rain Barrel Green Rooftop Redding Library Rain Garden Redding Library Permeable Pavers Vegetative Buffers Biofilter Biofilter Vegetative Swale

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Low Impact Development Practices Low Impact Development Practices Low Impact Development Practices Low Impact Development Practices

Pervious surfaces Filter runoff through vegetation, soils and organic

g g , g matter

Pollutants processed through plant uptake and soil

b t i bacteria

Runoff is reduced by detention, infiltration,

evaporation and evapotranspiration by vegetation evaporation and evapotranspiration by vegetation

Increase groundwater recharge Assist with water conservation Assist with water conservation

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LID / The Water Cycle LID / The Water Cycle

Transpiration Precipitation Evaporation Direct Runoff Evaporation Direct Runoff Infiltration Surface Waters Groundwater

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Paving Over Paradise Paving Over Paradise – The Problem The Problem Paving Over Paradise Paving Over Paradise The Problem The Problem

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Rethink Parking Spaces Rethink Parking Spaces – – The Solution The Solution

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LID Surface Alternatives LID Surface Alternatives LID Surface Alternatives LID Surface Alternatives

Porous Pavement

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Regulatory Considerations Regulatory Considerations g y g y

Require parking lot landscaping and allow it Require parking lot landscaping and allow it

to be used for BMPs All fl ibilit i th b f ki

Allow flexibility in the number of parking

spaces by business type

Use islands for bioretention or biofiltration Allow flexibility in overflow parking

y p g

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LID LID -

Pervious Surfaces

Pervious Surfaces

Grid systems Modular systems

Short Term: ~20% more expensive Long Term: cheaper, due to less drainage piping

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What If? What If? What If? What If?

Each new development minimized impacts

= slow deterioration slow deterioration

Each new development caused no new net impacts

= no improvement/status quo = no improvement/status quo

Each new development produced a positive impact

t ti = restoration

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LID LID - Before and After Development Before and After Development LID LID Before and After Development Before and After Development

P d l t Predevelopment After Urbanization

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LID Smart Growth Techniques

Low Impact Development (LID) Low Impact Development (LID) is a more sustainable land is a more sustainable land development pattern that development pattern that results from a site results from a site planning process that: planning process that:

Identifies critical natural resources

Determines appropriate building envelopes.

Incorporates a range of best management practices

Incorporates a range of best management practices (BMPs) that preserve the natural hydrology of the land. (BMPs) that preserve the natural hydrology of the land.

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Landscape Landscape –The Problem The Problem Landscape Landscape The Problem The Problem

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LID Landscape LID Landscape –The Solution The Solution LID Landscape LID Landscape The Solution The Solution

Rain Garden Rain Garden Rain Garden Rain Garden

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Examples of LID Examples of LID Examples of LID Examples of LID

Detain commercial roof runoff Landscape detention at a single family home Detain commercial roof runoff a single family home Filter runoff from a multifamily development Wetlands treating parking lot runoff

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LID Examples LID Examples

Xeriscape swale and flat curb for road runoff Landscaped buffers between lawn and sidewalk Residential roof runoff directed to vegetation

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Before LID After LID Before LID After LID Before LID After LID Before LID After LID

Grass Area Before LID LID- Grassy Swale

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Conserving Resources Today For Conserving Resources Today For Redding’s Tomorrow Redding’s Tomorrow

Martha M. Vuist Martha M. Vuist NPDES Coordinator NPDES Coordinator 530 530-224 224-6030 6030 530 530 224 224 6030 6030 mvuist@ci.redding.ca.us mvuist@ci.redding.ca.us