City of Burlingame Rain Garden

City of Burlingame Rain Garden

AgendaLocationProject History and DesignRain Garden parking lotDrainage storm runoffCurb Extension street runoff Landscaping California nativesConstruction changes in fieldFinancing - grantInterpretive SignLessons Learned

Location Downtown BurlingameProject LocationProject History and DesignExisting parking lot with on-street parking behind shopping district

Public Parking Lot C

Existing ConditionsMultiple drivewaysOriginal landscaping

Poor DrainageStreet runoff collects in gutterParking lot drainage ponds

RAIN GARDENLayout of Redesigned Parking Lot

Rain Garden Photos

STORM DRAINAGE Captures runoff from commercial buildings and parking lot1.32 acres of runoff equals 0.25 cfs for a 30 year eventDesigned for 0.43 cfs almost twice the required C3 guidelinesOverflow to curb for 50 to 100 year storm event

Rain Garden - runoff

Overflow to street

Cross Sections

CURB EXTENSIONCaptures Runoff from Street and Parking Stalls0.11 acres of runoff at 0.285 cfs design for 0.33 cfs exceeding C3 guidelines.Treats overflows from center cell of garden as well

LANDSCAPINGAll plants are California NativesIncludes Rush, Sedges, Carmel Creeper or Ceanothus, Iris, Barberry and BuckwheatTree specified was native Hackberrys - could not find and used Valley OaksIrrigation for first few years only -contractor installed as part of 6 month maintenance periodUse mulch that knits together not bark that floats

Valley Oak Trees

White flowering Ceanothus

Rushes and SedgesLandscape Plan

CONSTRUCTION Demolition of parking lot Relocation of lights Restriping of parking

Construction - continued Excavation Installation of rock Boardwalks Topsoil Landscaping Irrigation

Financing

Interpretive Sign Educating the public Staff designed sign Ordered from the Web

Lesson Learned: Infiltration TestPercolation test did not workInfiltration test didWorks like toilet floatThree tests through out the site

Lesson Learned continuedErosion along edgeGutter debris into curb extension use rock not pea gravel

LESSONS LEARNEDQuestions and CommentsThank you