environmental design - studentconferences.asce.org · must contain school name, team name, and...

ENVIRONMENTAL DESIGN T e c h n i c a l E v e n t s sponsored by Craftwater Engineering

2 Sponsored by Craftwater Engineering

P A C I F I C S O U T H W E S T C O N F E R E N C E 2 0 2 1 University of California, Los Angeles

ENVIRONMENTAL DESIGN 1. Objective

The PSWC Environmental Competition is an undergraduate project that gives students with civil and environmental engineering and related majors a chance to gain theoretical and practical hands-on experience in the fields of environmental & water resources engineering. The knowledge gained through an iterative process of research, design, laboratory testing, and operations is invaluable for both industry and academic pursuits. This year, the focus is on designing a conceptual multi-benefit regional Best Management Practice (BMP) project to address a number of Total Maximum Daily Loads (TMDLs) in the Los Angeles region. A TMDL establishes the maximum amount of a pollutant allowed in a waterbody and serves as the starting point or planning tool for restoring water quality.

Teams from 18 schools in the Pacific Southwest Region will participate in this competition. Students will work to satisfy MS4 permits and relevant TMDLs through the design of stormwater capture facilities by employing their skills involving conceptual drawings, maps, geospatial analysis, hydraulic analysis, and technical writing.

This project is judged based on (1) a design report and (2) a virtual presentation. Students are encouraged to work closely with university faculty and local engineering professionals to create a practical and innovative method of addressing the problem statement.

2. Background The goal of the Clean Water Act (CWA) is to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters. The Clean Water Act requires states to adopt water quality standards to protect lakes, streams, and wetlands from pollution. Section 303(d) of the Clean Water Act authorizes EPA to assist states, territories, and authorized tribes in listing impaired waters for which technology-based effluent limits for National Pollutant Discharge Elimination System (NPDES)-permitted dischargers are not sufficient to attain water quality standards. States must give the waters on the list a priority ranking, accounting for the severity of the waters’ pollution and uses, and then develop TMDLs for these water bodies based on the ranking.

On November 8, 2012, the Los Angeles Regional Water Quality Control Board adopted the latest Municipal Separate Storm Sewer System (MS4) permit which became effective December 28, 2012. The MS4 permit adopted is also known as Los Angeles Regional Board Order R4-2012-0175, Waste Discharge Requirements for Municipal Separate Storm Sewer System (MS4) Discharges within the Coastal Watersheds of Los Angeles County, except those Discharges Originating from the City of Long Beach MS4. In 2015, the MS4 permit was amended by State Water Board Order 2015-0075. An MS4 is defined as a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains) that is (1) designed or



used for collecting or conveying stormwater and (2) is owned or operated by a city, county, or other governmental entity (including federal and state entities). In general, the term “MS4” excludes (1) combined sewers and (2) systems that are part of publicly owned treatment works. MS4 permits authorize cities, counties, or other governmental entities to discharge stormwater collected by their storm sewer systems to waters of the United States (WOTUS).

The Los Angeles County MS4 permit allows permittees the flexibility to develop Watershed Management Programs (WMPs) or Enhanced Watershed Management Programs (EWMPs) to implement the requirements of the permit on a watershed scale through customized strategies, control measures, and best management practices (BMPs). The EWMP is a document that will provide a road map for municipalities throughout Los Angeles to simultaneously comply with federal water quality mandates, improve the quality of rivers, creeks and beaches, and address current and future regional water supply challenges. The City of Los Angeles is a part of four watersheds: (1) Ballona Creek, (2) Dominguez Channel, (3) Santa Monica Bay, and (4) Upper Los Angeles River.

In November 2018, the Safe, Clean Water Program was created by the passing of Measure W. This program specifically supplies funding to local stormwater and urban runoff in order to increase LA County’s local water budget, improve and maintain water quality, and protect public health by generating up to $285 million a year. This budget is split into three funding streams; flood control district program, municipal programs, and regional programs. The district program constitutes 10% of the budget to aid LA County Flood District in helping building capacity programs such as public education, local force job training and school education. The municipal program is a direct injection of 40% of the total budget to enable local city governments to address local stormwater and urban runoff challenges through nature based and multi-benefit projects. Lastly, the regional program takes the remaining 50% of the budget to watershed area steering committees to develop annual Stormwater Investment Plans to channel these funds into Infrastructure projects, Technical Resource programs, and Scientific Studies programs. (safecleanwaterla.org).

Your team will be asked to identify a solution for the Upper Los Angeles River watershed as outlined in the problem statement below.

3. Problem Statement The City of Los Angeles is responsible for providing a safe and reliable supply of water for residential, commercial, governmental, industrial, and institutional uses for over 4 million customers. Since the early 1900s, the City has supplied water from a variety of sources, including Owens Valley via the Los Angeles Aqueduct; imported water from Northern California via the California Aqueduct and the Colorado River via the Colorado River Aqueduct (refer to Figure 1); and several local water sources including groundwater, recycled water, and conservation. Future water supply reliability will be challenged by changing regulations, environmental considerations, population growth, and climate change. Additional water resources will be



required to address the challenges in order to ensure sufficient supply to meet long-term growth demands. Capturing, treating, and using stormwater can offset potable and nonpotable water demand. In addition to the current capture, the City of Los Angeles is hoping to capture an additional 300,000 acre-feet in the Los Angeles Basin.

The City of Los Angeles is issuing a Request For Proposal (RFP) from qualified consultants to create a conceptual design of a multi-benefit large-scale regional Best Management Practice (BMP) project that will be beneficial on the watershed scale. The project must be sited within the City of Los Angeles jurisdictional boundaries, and must capture stormwater from a drainage area of at least 100 acres. Your team’s project must include structural BMPs and non-structural BMP measures, otherwise known as source controls. The project must address the appropriate Los Angeles River TMDLs as outlined in Chapter 7 of the Los Angeles Regional Water Quality Control Board Basin Plan. These include: ☼ Los Angeles River Watershed Trash TMDL ☼ Los Angeles River Nitrogen Compounds and Related Effects TMDL ☼ Los Angeles River and Tributaries Metals TMDL ☼ Los Angeles River Bacteria TMDL

Your team may also explore any other water quality objectives that may be of interest for the Upper Los Angeles River watershed, but have not yet been given a TMDL. In addition, the City of Los Angeles is interested in exploring innovative filter media that could address the aforementioned TMDLs. Pending the evolving COVID-19 situation, your team may also be asked to do a feasibility study of the suggested filter media, should in-person classes resume. A decision will be sent out by December 21, 2020.



Because your team has connections to a university faculty member, the City would also like your team to explore any research literature belonging to any faculty member that could help advance your team’s understanding of the watershed situation, proposed conceptual design, community benefits, etc.

Based on the submission of the conceptual design proposals, the City of Los Angeles will pick one to proceed with to then apply for funding from the Safe Clean Water Program. Thus, it will be advantageous for your team to keep the scoring requirements of the Safe Clean Water program in mind when developing the conceptual design report.

4. Participant Rules ☼ Each university may enter only one team ☼ Be enrolled in a degree program (undergraduate or graduate) at one of the participating

universities in the Pacific Southwest region ☼ Team must be composed of four members ☼ All team members must be present during the presentations ☼ The team must have at least one underclassman ☼ The team must have at least one male and female ☼ All team members must be a registered participant of PSWC 2021

5. Project Requirements Design Report Each team is required to submit a technical design report detailing the overall project goals and the team’s design. The report must include a description of the design process, treatment principles utilized, environmental impacts, and a cost analysis. The design report is worth 150 points.

Please submit an electronic version of your report (in PDF format) via email to [email protected] with the subject line “[School Name] [Environmental Design]” Report by no later than 11:59 PM (PT) on February 26, 2021. A hard copy submission is not required.

Refer to the Technical Report Submissions and Presentation Guidelines.pdf FAQ section for any clarifications.

Formatting One (1) point will be deducted from the team’s report score for each violation:



☼ Report Cover Page: Must contain school name, team name, and competition name: “2021 ASCE PSWC Student Environmental Competition”

☼ Table of Contents: Limited to a total of two (2) pages.

☼ Body of Work: Must be a minimum of 1000 words. Note: There is no limit to the design report; however, it must only contain relevant materials. Specific content requirements for the Body of Work are presented below.

☼ Appendices: Pages shall be numbered in such a way that the appendix and page number are clear listed (i.e. A1, A2, B1, B2, etc.). There is no limit to appendix length, but it must only contain relevant materials.

☼ List of References: In-text citations should be used as appropriate throughout the Body of Work. A list of references or works cited should be included (if necessary) and will not count towards the report page limit. Any advisors on the project shall be recognized either in the List of References or in an Acknowledgements section.

☼ Formatting & Miscellaneous: § Use 12-point font, single spaced, and 1-inch margins on all sides. § Apart from headings, Times New Roman or Arial font must be used, and the

text shall have normal width character spacing. § Headings may be of any font, size or color. § Body pages shall be numbered, beginning with ‘1’. § Captions used for any photographs, tables, line drawings, graphs, or other

figures shall have normal width character spacing and be no less than 10-point font.

§ The main report shall be presented on 8½“ x 11” pages with portrait orientation. Appendices shall also be presented on 8½“ x 11” pages; however, appendices may include landscape-oriented pages for figures, tables, etc. if desired.

Body of Work Content The design report must include the following content. The point distribution for grading of each section is denoted in parentheses.



☼ Project Executive Summary:

The design report must include an executive summary of the project. This summary must include the client’s objectives and your team’s recommendation.

☼ Project Background: The background should contain an overview of the regulatory requirements in Los Angeles County, information about the watershed, requirements to meet the Safe Clean Water Program’s scoring criteria, and the team’s structure.

☼ Literature Review: The report should include a literature review of aspects related to hydrology, hydraulics, green infrastructure, ecosystem services, and disadvantaged communities. This section is meant to encourage teams to make connections with faculty members at their university. Note that the entire literature review does not have to come solely from your own university - your team may use literature from the world wide web.

☼ Site Investigation Your team should collect information regarding the site, including conflicting utilities, soil infiltration rates, and hydrogeology.

☼ Hydrology and Hydraulics: A hydrologic and hydraulic analysis shall be done to quantify the magnitude of incoming flows from the drainage area into the BMP. Your team should also consider how the topography and land uses within the drainage area affect the magnitude of runoff.

☼ BMP Design Components:

The BMP(s) shall be properly sized according to a certain water quality event and/or based on rainfall time series. Please discuss the alternatives considered and the decision criteria your team used to decide on the BMP(s). Diagrams illustrating the planned project siting and components of the BMP(s) are recommended.

☼ Water Quality Filter Discussion: Propose and evaluate the effectiveness of filters in improving discharge water quality and addressing the TMDLs. Your team should also include a discussion on the treatment principles utilized and the physical, chemical, or biological mechanisms in which your filter media works to reduce pollutant load.



☼ Ecosystem Services Discuss wider-ecosystem benefits which design can provide

☼ Community Investment Benefit Consider how design benefits disadvantaged communities in the vicinity. The report should highlight if and how the proposed design addresses a documented environmental justice issue impacting the local community.

☼ Non-structural BMPs Elaborate on the design considerations behind non-structural BMPs incorporated into the site design and/or watershed management plan.

☼ Operations and maintenance Briefly discuss required O&M tasks (e.g. cleaning out media filter x amount of days) required for proposed design, including any advantages proposed design has in terms of O&M.

☼ Cost Analysis o Competitiveness in getting approval from respective Watershed Area

Steering Committee (WASC) § Safe Clean Water § The ULAR bases their infrastructure program project funding on the

following criteria for the project; water quality benefits, significant water supply benefits, community investment benefit, nature-based solutions, leveraging funds and community support. Respectively, the criteria have the following weights; 50 pts, 25 pts, 10pts, 15 pts, and 10 pts for a total of 110pts.

§ Clarify the funding request in terms of the fiscal year (how much do you need from SCW per year for your project)

☼ Limitations Provide critical view of proposed design by highlighting three limitations of design which could be further improved.

☼ Recommendations and Conclusions o Future Feasibility Study

Oral Presentation Refer to the Technical Report Submissions and Presentation Guidelines pdf for directions on how to conduct the presentation.



Please submit a copy of your presentation (in Google Slides format) via email to [email protected] with the subject line “[School Name] [Environmental Design] Presentation” by no later than 11:59 PM on March 12, 2021. A hard copy submission is not required. No changes to the presentation can be made after this date. Time and Schedule Teams will have 5 minutes to present as well as 5 minutes to answer questions from judges. Presentation order and scheduled presentation times will be randomly selected before the competition begins and will be provided no later than the time of online check-in. Presenters Presenters include those with speaking parts and individuals operating the computer. A minimum of two people must speak during the presentation. The use of videos will not be permitted. Teams must not pre-record any speaking parts. No handouts or other materials are to be given to the judges as part of the oral presentation. All team members participating in the presentation must be on stage and available for judge’s questions.

6. Scoring

The point distribution for grading of the technical design report is denoted in parentheses. A maximum of 200 points is available for the report. 1. DOCUMENTATION (30)

a. Are the documents well-written, free of errors, and comply with formatting requirements?

b. Are the documents of sufficient quality to enable the judges to evaluate the design?

c. Does the project include a description of the overall project goals, project context, project regulations, existing conditions along with the problem to be solved, proposed green infrastructure approaches, and expected outcomes?

d. Does the team appear to have conducted the background research necessary to support their design?

e. Does the literature review set up a multi-disciplinary, interconnected approach to the design? Did the team include at least one piece of literature from at least one professor from their university?

f. Did the team research the Safe Clean Water criteria? Did the team quantify how well their project meets the goals of the Safe Clean Water Program scoring criteria?

g. Are references supportive of the design concept?

2. PERFORMANCE (50) a. Does the design adhere to the drainage area requirements? b. Will the design retain and treat stormwater runoff (e.g., through infiltration,

evapotranspiration, or harvest and use) to improve water quality?



c. Does the design address the required TMDLs with innovative filter media? Does the design quantitatively demonstrate pollutant removal?

d. Will the design address multiple water resource goals (e.g., water conservation, flood mitigation, groundwater recharge, water harvesting and use, water reuse)?

e. Where appropriate, is the predicted performance quantified and supported by modeling and calculations? Calculations should at the minimum include the design storm managed and/or the annual reduction in runoff volume.

f. Will the design implement non-structural controls in addition to structural controls? g. Is the team’s design feasible? h. Does the design incorporate flexible implementation strategies that allow planning

efforts to adapt to changing circumstances over time? i. Does the design reference the appropriate local and/or state design standards?

3. COMMUNITY, ECOLOGICAL, AND INFRASTRUCTURE RESILIENCE (25)

a. Does the project model solutions that effectively manage stormwater runoff and are broadly applicable to local resiliency priorities? Relevant topics may include but not limited to ecological restoration and/or preservation, water conservation, erosion control, flood control, or the ability to withstand and/or recover from extreme weather events.

b. Where applicable does the project include regionally appropriate, native vegetation that will provide ecosystem services that integrate the natural and built environments?

c. Are the predicted ecosystem services quantified and supported by appropriate assumptions and models?

4. INNOVATION AND VALUE TO COMMUNITY (15) a. To what extent were innovative approaches developed to simultaneously address

community environmental, social, and/or economic objectives? Will the project benefit Disadvantaged Communities (DACs)?

b. Does the project describe how the design will be integrated into the community and how the design will benefit the community (e.g., by providing educational or recreational opportunities)?

c. Are there public health benefits provided by proposed design?

5. INTERDISCIPLINARY COLLABORATION (10) a. Does the project demonstrate collaboration between different disciplines (e.g.,

landscape architecture, architecture, engineering, environmental science, biology, economics, public administration, business administration, communications)?

b. Do the project components convey the functionality and value of the design with a cohesive, multi-disciplinary perspective?

6. FINANCIAL VIABILITY (10)

a. Does the team present a cost estimate for the proposed project? b. Does the team account for the cost of long-term operations and maintenance?



c. Did the team research grants, loans, or other sources of financing that can cover the projected cost of the project?

7. COMMUNITY ENGAGEMENT (20) a. Does the project contemplate public outreach and education (e.g., examples of

signage, infrastructure tours, or other learning opportunities)? b. Will the proposed project complement efforts within the broader community or help

address environmental, economic, or social areas of need? c. Will the project forge partnerships and/or identify stakeholders (e.g., university staff,

alumni networks, city, county, state, non-profit, private entities) that could help support the proposed project? The purpose of such partnerships or stakeholder involvement could include, but is not limited to financial support, operations and maintenance, design consultation, or environmental education.

8. MAINTENANCE (10) a. Does the design allow for easy and effective maintenance? b. Does the narrative contain information on how the project will be operated and

maintained over time?

9. MISCELLANEOUS (10)

10. QUALITY OF METHODOLOGY (20) a. Does the design accurately model the hydrology and hydraulics for the system?

The point distribution for grading of the oral presentation is denoted in parentheses. A maximum of 50 points is available for the oral presentation.

1. Technical Content (20) 2. Response to Questions (15) 3. Visuals (10) 4. Time (5)

The following table provides examples that teams may use to document how their projects meet these criteria. This information is not required, as not all of it may be relevant to a particular design. To the extent that this information is relevant, however, quantitative information on the anticipated outcomes of a team’s design using models will be more compelling than narrative descriptions. Teams that opt to present any of the information listed below are encouraged to use the suggested units to facilitate the judging process. Teams are also encouraged to describe the methodologies used and to provide references, as appropriate. Entries should adhere to the appropriate LA County design standards.



Outcomes Example Metrics and Terminology

Stormwater Management

Reduction in impervious area (sq. ft., %)

Reduction in directly connected impervious area (sq. ft., %)

Reduction in runoff depth from existing and/or natural condition (in/year, %, or size or design storm managed)

Change in annual stormwater pollutant load from existing condition (pounds/acre/year)

Change in stormwater peak flow from existing and/or natural condition (based on 1-year, 24-hour design storm and expressed as cubic feet/second/acre, %)

Integrated Water Management

Reduction in landscape water requirement (may be attributed to change in plant species or change in irrigation efficiency) (gallons/year, %)

Reduction in potable water use for irrigation (may be attributed to reduction in landscape water requirement or use of captured rainwater or recycled gray water) (gallons/year, %)

Reduction in potable water use for indoor uses (gallons/year, %)

Annual groundwater recharge (gallons/year)

Annual amount of water diverted to sanitary sewer/recycling facility (gallons/year)

Ecosystem Services

Area of protected or restored soils (acres, sq. ft.)

Area of protected or restored native plant communities (acres, sq. ft.)

Increase in canopy cover (10 years after installation) (% of site area)

Increase in roof area shaded by vegetation (% of roof area)

Increase in hardscape area (roads, sidewalks, parking lots, courtyards) shaded by vegetation (% of hardscape area)

Map showing locations of windbreak vegetation relative to buildings



Reduction in building electricity consumption due to vegetation roof insulation/evapotranspiration or tree shading (Kwhs, %)

Carbon dioxide (CO2) sequestered by new trees (lbs/year)

Change in plant diversity (plant list before and after project; use of native plants; use of minimum input minimum maintenance plants; % of plants in specified category)

Change in pollinator and/or wildlife diversity (list of species supported by plants before and after project)

Financial Viability

Total Project Cost Estimate: an itemized estimate of the project cost based on the projected period of construction.

Operations and maintenance: Appropriate operation and maintenance activities ensure that green infrastructure will continue to function properly and yield expected water quality and environmental benefits, protect public safety, meet legal standards, and protect communities’ financial investments. The cost of maintaining infrastructure over time is an important consideration when planning a project.

Useful life: The period of service for an infrastructure asset. Projects should have funding sufficient to operate and maintain assets throughout their period of service.

The following table displays the Environmental Design Competition’s distributed scoring system. There are a total of 250 points. The competition is composed of two categories: design report and oral presentation. It is under the judge’s discretion to score teams in a professional manner.



Design Report (200) Documentation 30

Performance 50

Community, Ecological, and Infrastructure Resilience 25

Innovation and Value to Community 15

Interdisciplinary Collaboration 10

Financial Viability 10

Community Engagement 20

Maintenance 10

Miscellaneous 10

Quality of Methodology 20

Oral Presentation (50) Technical Content 20

Response to Questions 15

Visuals 10

Time 5

7. Software and References

The following software and references may be useful in the development of your team’s report. Note that this is not an exhaustive list of software that your team may use nor is your team required to use all of the software mentioned for the report. The majority of the software are open source.



AutoCAD AutoCAD is a computer-aided design (CAD) software that architects, engineers, and construction professionals rely on to create precise 2D and 3D drawings. CalEnviroScreen 3.0 Developed by the California Environmental Protection Agency (CalEPA), this tool aims to target local, state, and regional policies to protect the hardest-hit communities. CalEnviroScreen 3.0 (CES 3.0) is a place-based cumulative impact screening methodology that uses 20 indicators to provide a statewide ranking of California’s 8,000 census tracts. In this context, a “cumulative impact” assessment examines “multiple chemicals, multiple sources, public health and environmental effects, and characteristics of the population that influence health outcomes.” CES 3.0 provides one clear, accessible, and science-based method for identifying overburdened environmental justice communities or disadvantaged communities (DACs) and the particular challenges that they face. HydroCalc by LA County The HydroCalc Calculator allows the site design/engineer to calculate runoff rates and volumes from the water quality storm. International Stormwater BMP Database Database of over 700 BMP studies, performance analysis results, tools for use in BMP performance studies, monitoring guidance and other-study-related publications.

InVEST

InVEST (Integrated Valuation of Ecosystem Services and Tradeoffs) is a suite of models used to map and value the goods and services from nature that sustain and fulfill human life. If properly managed, ecosystems yield a flow of services that are vital to humanity, including the production of goods (i.e. food), life-support processes (i.e. water purification), and life-fulfilling conditions (i.e. beauty, opportunities for recreation). It helps explore how changes in ecosystems can lead to changes in the flows of many different benefits to people. InVEST enables decision makers to assess quantified tradeoffs associated with alternative management choices and to identify areas where investment in natural capital can enhance human development and conservation. Some of the InVEST modular models include:

☼ Carbon ☼ Habitat Quality ☼ Habitat Risk Assessment ☼ Recreation ☼ Sediment Retention ☼ Urban Cooling ☼ Urban Flood Risk Mitigation ☼ Water Purification



Los Angeles Hydrology Manual (2006)

The manual is based on the Los Angeles County Department of Public Works’ hydrologic design procedures. It explains the steps involved in converting rainfall to runoff flow rates and volumes.

Los Angeles Regional Water Quality Control Board (LARWQCB) Basin Plan The Los Angeles Regional Board’s Basin Plan is a resource for the Regional Board and others who use water and/or discharge wastewater in the Los Angeles region. The Basin Plan (i) designates beneficial uses for surface and ground waters, (ii) sets narrative and numerical objectives that must be attained or maintained to protect the designated beneficial uses and conform to the state’s antidegradation policy, and (iii) describes implementation programs to protect all waters in the Region.

MS4 Stormwater Permitting Guide (National Association of Clean Water Agencies) This guide is a useful tool for anyone looking at their first municipal separate storm sewer (MS4) permit and provides straightforward explanations of key practical and legal issues that are likely to confront MS4 owners and operators and their consultants.

QGIS QGIS is a free and open-source cross-platform desktop geographic information system application that supports viewing, editing, and analysis of geospatial data.

Safe Clean Water Program

The Safe Clean Water Program generates up to $285 million per year from a special parcel tax of 2.5 cents per square foot of impermeable surface area on private property in the LA County Flood Control District. Publicly-owned parcels, including schools, are exempt under the state law. The funding is distributed between the District Program (10% of total revenue), Municipal Program (40% of total revenue), and Regional Program (50% of total revenue). The goal of the program is to provide local, dedicated funding to increase Los Angeles County’s local water supply, improve water quality, and protect public health. SketchUp SketchUp is a premiere 3D modeling computer program for a wide range of drawing applications such as architectural, interior design, landscape architecture, civil and mechanical engineering, film and video game design.



SWMM EPA’s Storm Water Management Model (SWMM) is used throughout the world for planning, analysis, and design related to stormwater runoff, combined and sanitary sewers, and other drainage systems. It can be used to evaluate grey infrastructure stormwater control strategies, such as pipes and storm drains, and is a useful tool for creating cost-effective green/gray hybrid stormwater control solutions.

WMMS 2.0 by LA County

WMMS 2.0 consists of two components: Loading Simulation Program C++ and the Regional Optimization system. With the Regional Optimization system, WMMS 2.0 is capable of evaluating cost-effective combinations of local-scale low impact development (LID) type BMPs and watershed scale BMPs. The model determines the optimal distribution that attains the Total Maximum Daily Load (TMDL) targets for a variety of pollutants for the lowest BMP implementation cost. WMMS 2.0 utilizes the System for Urban Stormwater Treatment and Analysis Integration (SUSTAIN) to calculate the most cost-effective set of BMPs, and optimizes its results for large scale analysis.

The LSPC watershed model is utilized to simulate hydrology and pollutant loading. This source loading component considers point and nonpoint source contributions specific to and calibrated to Los Angeles County. Pollutant loading parameters are drawn from land use-specific storm water monitoring data from Southern California Coastal Water Research Project (SCCWRP).

EPA’s SUSTAIN is then used to evaluate structural stormwater BMP scenarios. SUSTAIN simulates pollutant load removal through the use of pollutant-specific first order decay rates from SWMM4 User’s Manual (James, W. et. al., 2002).

The user is prompted to create a scenario to run by identifying basins or sub-basins of interest, parameters to simulate (i.e. pollutant load, total surface outflow), and structural BMPs to evaluate. The user can also specify the time period for the output (i.e. annual average, monthly average).

environmental design - studentconferences.asce.org · must contain school name, team name, and...

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