TORMWATER MANAGEMENT USING CUSTOMIZED SCIENCE BASED · PDF fileSTORMWATER MANAGEMENT DECISIONS. . Nicole Beck, PhD. Gary Conley, MS. Donna Meyers, MS. STORMS Seminar Series. January

STORMWATER MANAGEMENT DECISIONSwww.2nform.com

Nicole Beck, PhDGary Conley, MS

Donna Meyers, MS

STORMS Seminar SeriesJanuary 30 2017

STORMWATER MANAGEMENT USING CUSTOMIZED SCIENCE-BASED SOFTWARE

• New Trajectory Toward Clean Water – Plan, Prioritize, Implement

• Stormwater Software P lanning, Tracking, R eporting Technical E lements

• P a c i f i c G r o v e A S B S C a s e S t u d y

• Q&A (C entral C oas t R egional B oard S taff and S tormwater Managers on the line)

Presentation Outline

In 2014 estimated $1 - $1.5 billion (2025 > $1.5B ) annually on MS 4 permit compliance. (P ublic P olicy Ins titute of C A 2014).

C urrent C A s tormwater funding gap $500M- $800M annually.

Only 5% of recent water bonds s pent on s tormwater.

B enefits have to be better communicated and local governments need tools to document thes e benefits to voters .

Nearly two decades of work….

Compliance

E ffic iency

P rogress and Value

Transparency

Financial S upport

Stormwater Manager’s Needs

• Complex and costly

• High reliance of experts

• Academic approach to an applied problem

Have we lost the forest through the trees?

Current approach to Monitoring & Modeling

Water quality improvement requires science and funding. We will never have enough of either

EFFECTIVE IMPLEMENTATION GETS US CLOSER TO CLEAN

WATER

Accessible science

Quantiative iterative approach

Integrated water management

Trajectory toward Clean Water

Plan, Prioritize, Implement

Central Coast Collaborative ProcessSTORMWATER MANAGEMENT DECISIONS

Tamara Anderson, Central Coast Water BoardJeff Condit, MRSWMPTom Harty, Monterey CountyBridget Hoover, MBNMSDarla Inglis, UC Davis, LIDI Dave LeCaro, City of Paso RoblesFrank Lopez, rep. Cities of Gonzales and SoledadJackie McCloud, City of Watsonville

Jill Murray, City of Santa BarbaraEllen Pritchett, City of Santa Maria

Terry Reynolds, Santa Cruz CountyDominic Roques, Central Coast Water Board

Alyson Tom, Santa Cruz CountyAgnes Topp, City of Santa Cruz

Mary Whittlesey, City of San Luis ObispoTricia Woton, City of Monterey

Next generation of the tools supporting theLake Clarity Crediting Program

STORMWATER MANAGEMENT DECISIONS

Integrated system to empower municipalities to: ● Prioritize● Plan ● Track ● Report● Prioritize (again)Adaptively manage stormwater

Cost effect ive MS4 compliance

www.2nform.com

Standardized software to monitor and model

Spatially explicit watershed based approachSTORMWATER MANAGEMENT DECISIONS

Site Scale Urban Catchment Scale Subwatershed Scale(MS4, watershed, region, state)

Implement and assess effectiveness of actionsSTORMWATER MANAGEMENT DECISIONS

• Parcel runoff controls

• Street sweeping

decentralizedbioretention

infiltration featurescatch basins

etc.

centralizeddry basinswet basins

detention basinsetc.

CA PII PermitE.11E.12E.15

improveE.7E.8

Site Scale

Non-structural BMPs Structural BMPs


City of South Lake Tahoe (2013)

v1 created 2009

Lake Tahoe (v2)C entral C oas t (v3

Quantify effectiveness of actionsSTORMWATER MANAGEMENT DECISIONS

Baseline: No BMPs Current or Planning: with BMPs Load reduction to receiving waters- =100 acre feet/year

20 tons/year80 acre feet/yr

15 tons/yr20 acre feet/yr (20%)

5 tons/yr (25%)

CA PII PermitE. 9.aE.14

Urban Catchment Scale

APN: 102256

1. Inform spatial priorit ies for focused and iterat ive planning


ft/yr

APN: 102256

2. Quantify, track and report progressSTORMWATER MANAGEMENT DECISIONS

CA PII PermitE.14

3,005

2.955

50

2.625

913

2.725

813

2.025

1,513

1,849

1,689

0% 2% 26% 23% 43% 48%

APN: 102256

Regional Board grantedread-only access

to RELEASEDpermittee records


Annual Compliance Report ing


Technical Elements

Development Objectives

1. Directly usable by stormwater managers

2. Only as complex as necessary

3. Scientifically defensible

Beck, Conley, Kanner and Mathias, 2017. An urban runoff model designed to inform stormwater management decisions. Journal of Environmental Management (in press).

www.s wtelr.com


Aligning tool design with purpose

(EPA, 2009. Guidance on the development, evaluation and Application of Environmental Models)

• Natural variability of water quality data make understanding changes difficult.

• Capturing this variability helps to isolate the signal of management actions

• TELR characterizes regional rainfall distributions using a 30 yr. historic record (PRISM dataset)

• Simulate 4 discrete 24 hr events adjusted for occurence frequency and # of rain days per year.

• Model time step aligned with management information needs + a computational advantage


Scales of representation

Beck, Conley, Kanner and Mathias, 2017

Keep it focused and simpleSTORMWATER MANAGEMENT DECISIONS

BMPs and performanceRegional precipitationImpervious coverageHydrologic connectivitySoil type Land use

Leverage proven stormwater modelling methods + publicly available data sets

• USDA curve number for runoff generation

• Routing via NRCS lag method w/urban adjustments

• BMP flow allocation by hydrograph separation.

• LU characteristic runoff concentrations

Key Inputs

Sequential routing to quantify BMP benefitsSTORMWATER MANAGEMENT DECISIONS

Receiving water

CATCHMENT B

• Explicit routing across landscape features and between catchments

• Centralized BMPs can drain subcatchments within catchments and employ treatment trains.

• Routing between catchments so that downstream catchments and receiving waters incorporate cumulative BMP bennefits

Non structural BMPs Parcels/Roads

Decentralized BMPs

Centralized BMPs

CATCHMENT A

Runoff validation to observed dataSTORMWATER MANAGEMENT DECISIONS

Observed data from long-term sub hourly urban catchment hydrology monitoring in Tahoe Basin. 2NDNATURE 2012, 2014

● Annual estimated flows show good regional correspondence with measured data.

● Average percent bias = 14%, NSE = 0.97 (0.88 w/o Eloise)


Comparisons to continuous simulationSTORMWATER MANAGEMENT DECISIONS

Over 40 hypothetical 100 acre urban catchments with range of soil type, climate and imperviousness. Distribution of % average annual difference.

• Average difference between SWMM-based NSWC and TELR = -2.3 %



City of South Lake Tahoe (2013)

City of South Lake Tahoe PLRM (nhc et al 2009) baseline estimates for urban catchment (2013). Consistent inputs for TELR.

• Good average annual alignment with PLRM

• TELR 4 hrs v PLRM 40hrs to generate compile results

Efficient simulation, automated data management and mapped result

MS4 Mapping Guidance v 2.4 2NDNATURE 2016

standardized process and formats


City of Pacific Grove and City of Monterey

Area of Biological Significance (ASBS)

CASE STUDY


Pacific Grove Urban Greening PlanASBS Compliance Plan

ASBS Structural BMP Implementation PlanFunding: Prop 84Match: City of Pacific Grove

City of Monterey

Multiple uses includingfuture Regional SWRP

TELR Baseline (no BMPs)597.9 ac ft/yr

BR


Planned structural BMPs

Planning Scenario

Baseline Planned Reduction

Runoff (ac ft/yr)

597.9 462.1 135.8 (23%)

Particulates (T/yr)

71.3 28.9 42.4 (60%)

Hypothetical…Post Implementation (May 2025)


TELR Scenario Runoff(ac-ft/yr)

Baseline Load 597.9

Objective 462.1 (23%)

Current (2025) Load 503.0 (16%)

4 catchments in subwatershed


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TORMWATER MANAGEMENT USING CUSTOMIZED SCIENCE BASED · PDF fileSTORMWATER MANAGEMENT DECISIONS. . Nicole Beck, PhD. Gary Conley, MS. Donna Meyers, MS. STORMS Seminar Series. January