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Stormwater Management and Infiltration along Central Corridor Light Rail Transit
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Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Jul 22, 2020

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Page 1: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Stormwater Management and Infiltrationalong Central Corridor Light Rail Transit

Page 2: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Central Corridor LRT Project Overview

Page 3: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

University Ave ConstraintsUniversity Ave ConstraintsTight 120’ wide ROWBuildings at ROW lineDensely utilized undergroundzoneRoad and building access to oad a d bu d g access tobe maintained at all times.

Page 4: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

University Avenue Today

Page 5: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Current LandLand Use

Page 6: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

University Ave Cross Section

Page 7: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Capitol Region Watershed DistrictRequirementsRequirements

Rate control

V l d tiVolume reduction

Water qualityWater quality

Page 8: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

City Policies and GoalsTransit oriented developmentTransit oriented developmentEnhanced streetscape & livabilityServe multi modal transportation needsServe multi-modal transportation needsLong-term maintainability

Page 9: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

LRT and Roadway Requirements

Required clearances

St i t b d i tStrict subgrade requirements

Required utilities and structuresRequired utilities and structures

Accommodate projected ped & vehicle t ffitraffic

Long-term maintainabilityLong term maintainability

Page 10: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Existing Contamination IssuesExisting Contamination Issues

G d Di lGas and Diesel

Chlorinated SolventsChlorinated Solvents

Heavy Metalsy

Over 10% of the Corridor has limitations due to contamination

Page 11: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Successful Solutions will…

Stakeholder buy-in including City, County, State and Watershed.Combine and overlap facilities to address more than one goal with the same real estategFit within tight CCLRT budgetB i t i bl i t ith t t dBe maintainable in concert with street and LRT operations.

Page 12: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Screening ProcessCompatible with surface and subsurface useCompatible with surface and subsurface useAddress contaminated soils concernsS it bl il ditiSuitable soil conditionsCost effectiveProven performance

Input and review by 8 different consultants and 5 agenciesWorkshop with over 50 participants

Page 13: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Green Practices Screening Process

Page 14: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Screening Results

Infiltration trench with integrated streetscape and storm water conveyanceSump inlets with surface skimmingConvert paved surfaces to perviousConvert paved surfaces to perviousRain gardensSt t l tStormwater plantersInfiltration under side streets

Page 15: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Infiltration

Responds to all 3 watershed goalsResponds to all 3 watershed goals .Could be combined with streetscape and t t dstorm water conveyance needs

Compatible with certain surface and subsurface uses.

Page 16: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Integrated Tree/InfiltrationTree/Infiltration

Trench

Page 17: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Infiltration Trench Details

Page 18: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Infiltration Plan View

Page 19: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Typical Infiltration Trench Profileypical nfilt ation ench ofile

Page 20: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Infiltration Trench

ConstructionStaging

Page 21: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Trees Planted Outside

Infiltration fAreas

Page 22: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Infiltration Section without Trees

Page 23: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Tree Trench withwith

Structural S ilSoil

Page 24: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Street & Median LandscapingSt eet & edian andscaping

Page 25: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Typical Crossing Area

Page 26: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Typical Station Area

Page 27: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm
Page 28: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Measuring Success

Volume reduction of approx 3 Acre-FeetTreats runoff from 100 acres of pavementAdded over 2000 treesAdded over 2000 treesAdded over 5 acres of new pervious area.Capturing and treating significant water from outside the project limits.

Page 29: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Additional Green Practices

CRWDStormwater PlantersStormwater PlantersRain Gardens

City of St PaulCity of St PaulSide Street Infiltration Trenches

M t C ilMet CouncilRoof collection/re-use from OMF

Page 30: Stormwater Management and Infiltration along …...Infiltration Responds to all 3 watershed goalsResponds to all 3 watershed goals . Could be combined with streetscape and stt dtorm

Thank Youhank ou