County of San Diego’sCounty of San Diego’sLID ProgramLID Program

Department of Planning and Land Department of Planning and Land Use MSCP - Watershed PlanningUse MSCP - Watershed Planning

Christine A. SloanChristine A. Sloan

Presentation OutlinePresentation Outline

• County of San Diego Overview

• History of County’s LID Program

• LID Municipal Requirements

• LID Program Timeline

• San Diego LID Considerations

San Diego OverviewSan Diego Overview

Village CoreVillage Core

VillageVillage

SemiSemi--RuralRural

Rural LandsRural Lands

No JurisdictionNo Jurisdiction

Regional Regional Categories:Categories:

97

County History on LID County History on LID ProcessProcess

Mar 2005 DPLU-Watershed Planning proposes LID Program

Jun 2006 CAO requires draft LID Guidance Manual by FY 2007

Jan 2007 Municipal Permit includes LID

Mar 2007 Guidance Manual created

Apr 2007 LID TAC reviews begin

Jul 2007* Draft Public Release

LID Program Goal:

To protect water quality by preserving and mimicking nature through the use of stormwater planning and management techniques on a development site.

LID management practices include:• Resource Conservation• Clustering• Minimizing impervious surfaces• Curb-cuts• Rain Gardens• Green Roofs• Permeable Pavements• Landscape detention/infiltration

County’s Pavement StudyCounty’s Pavement Study

Pervious Asphalt

Conventional Asphalt

Cottonwood Creek Park, EncinitasCottonwood Creek Park, Encinitas

Technical Advisory Technical Advisory CommitteeCommittee

• County of San Diego DPW DPLU DEH DPR DGS

• City of San Diego

• BIA

• Coastkeeper

• Consultants

Multidisciplinary TeamEngineersPlanners

DevelopersLandscape ArchitectsBiologists/Geologists

Legal

LID Guidance Manual LID Guidance Manual ContentsContents

LID Overview & Considerations Site Planning Practices

• Design Examples by Land Use Type

Integrated Management Practices Fact Sheets

Characteristics Application Design Maintenance Limitations Economics References

Revised Municipal PermitRevised Municipal PermitOrder No. R9-2007-0001 (Jan 24, 07)Order No. R9-2007-0001 (Jan 24, 07)

• In 365 days priority development projects must: Drain runoff from impervious to pervious

areas based on capacity Design pervious areas to receive runoff

based on soils, slope, etc. Use permeable pavements where

appropriate Implement site design BMPs where

applicable and feasible.

Order No. R9-2007-0001, Section D.1.d.(4)(a&b) Page 19

Revised Municipal PermitRevised Municipal PermitOrder No. R9-2007-0001 (Jan 24, 07)Order No. R9-2007-0001 (Jan 24, 07)

• In 18mths Copermittees must update Model SUSMP with LID: Establish LID requirements Establish siting, design, and maintenance criteria Establish where LID is applicable and feasible Establish requirements for permeable surfaces Establish LID restrictions in areas/uses with high

pollutant loads

• After Model approval, the County has 1 year to update affected ordinances.

Order No. R9-2007-0001, Section D.1.d.(7) Page 21

LID Program TimelineLID Program Timeline

• Draft Manual Public July 20, 2007

• New Permit (interim LID) Jan 24, 2008

• Model SUSMP update July 2008(LID requirements & criteria)

• Local SUSMP update *July 2009

• Ordinance Updates 2009-2010

* Earliest possible date

San Diego LID San Diego LID ConsiderationsConsiderations

• Climate• Fire• Irrigation

• Groundwater• Geology / Geotechnical

• Coastal Clay Pan Soils • Seepage• Steep Slopes

• Plant Palette• Economics

Water Conservation Garden, El CajonWater Conservation Garden, El Cajon

Source:Glen Schmidt, ASLASchmidt Design Group

Witham et al. (1998) Ecology, Conservation, and Management of Vernal Pool Ecosystems.

Clay SubstrateClay Substrate

Robert N. Hawk, PE, CEG, HGSenior Engineering GeologistCity of San Diego

Plant Palette ResearchPlant Palette Research

• Xeriscape Plants

• Irrigation

• Fire Hazard

• Bioremediation

• Invasive Species

Source: Truckee Meadows NV

SummarySummary

• Provide LID Guidance

• Plan and adapt around constraints

• ResearchArid Plants & EffectivenessGeological/geotechnicalEconomics in our regionUrban LID examples

• LID Education!

Mission Valley Library, San DiegoMission Valley Library, San Diego

Thank YouThank You