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 Impact Development (LID) � Low Impact Development (LID) Low Impact Development (LID) 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 design with pollution prevention measures to d design with pollution prevention measures to d i i i h i h ll i ll i i i compensate for land development impacts on compensate for land development impacts on h d h d hydrology and water quality. hydrology and water quality. l l d d li li
Formula for Low Impact Formula for Low Impact Development Development LID = engineering + hydrology + ecology + ecology + land use planning p g
Types of Low Impact Development Types of Low Impact Development Rain Garden Rain Garden Rain Barrel Green Rooftop Redding Library Redding Library Vegetative Buffers Permeable Pavers Biofilter Biofilter Vegetative Swale
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 bacteria t i � 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
LID / The Water Cycle LID / The Water Cycle Transpiration Precipitation Evaporation Direct Runoff Evaporation Direct Runoff Infiltration Groundwater Surface Waters
Paving Over Paradise Paving Over Paradise – The Problem Paving Over Paradise Paving Over Paradise The Problem The Problem The Problem
Rethink Parking Spaces Rethink Parking Spaces – – The Solution The Solution
LID Surface Alternatives LID Surface Alternatives LID Surface Alternatives LID Surface Alternatives Porous Pavement
Regulatory Considerations Regulatory Considerations g g y y � Require parking lot landscaping and allow it � Require parking lot landscaping and allow it to be used for BMPs � Allow flexibility in the number of parking All fl ibilit i th b f ki spaces by business type � Use islands for bioretention or biofiltration � Allow flexibility in overflow parking y p g
LID LID - - Pervious Surfaces Pervious Surfaces Grid systems Modular systems Short Term: ~20% more expensive Long Term: cheaper, due to less drainage piping
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 = restoration t ti
LID LID - Before and After Development LID LID Before and After Development Before and After Development Before and After Development P Predevelopment d l t After Urbanization
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 Identifies critical natural resources � Determines appropriate building envelopes. 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.
Landscape Landscape –The Problem Landscape Landscape The Problem The Problem The Problem
LID Landscape LID Landscape –The Solution LID Landscape LID Landscape The Solution The Solution The Solution Rain Garden Rain Garden Rain Garden Rain Garden
Examples of LID Examples of LID Examples of LID Examples of LID Landscape detention at a single family home a single family home Detain commercial roof runoff Detain commercial roof runoff Filter runoff from a Wetlands treating multifamily development parking lot runoff
LID Examples LID Examples Xeriscape swale and flat curb for road runoff Landscaped buffers between Residential roof runoff lawn and sidewalk directed to vegetation
Before LID Before LID Before LID After LID Before LID After LID After LID After LID Grass Area Before LID LID- Grassy Swale
Conserving Resources Today For Conserving Resources Today For Redding’s Tomorrow Redding’s Tomorrow Martha M. Vuist Martha M. Vuist NPDES Coordinator NPDES Coordinator 530 530 224 530-224 530 224-6030 224 6030 6030 6030 mvuist@ci.redding.ca.us mvuist@ci.redding.ca.us
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