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  • Reliability of Stormwater Best Management Practices in Washington DC Mohammadreza Jabehdari1, Leila Mosleh2, Guangming Chen3, Ph.D.

    1Doctoral candidate, 3Ph.D., Professor, Department of Industrial & System Engineering; Morgan State University 2Ph.D.Candidate, Department of Environmental Science and Technology; University of Maryland

    Background

    Research Objective & Methodology

    Object-Oriented Model

    .

    Methodology – System Analysis

    Industrial and System Engineering

    Mohammadreza Jabehdari, Doctoral Student Department of Industrial and System Engineering – Morgan State University Email: mojab1@morgan.edu

    Results and Conclusion

    Result - Reliability

    Combined Sewer Overflow (CSO):

    To avoid flood, regulators are designed to let the excess flow, which

    is a mixture of stormwater and sanitary wastes, be discharged directly

    into the rivers and creeks.

    Sanitary Sewer Overflow (SSO):

    untreated sewage is discharged from a

    sanitary sewer into the environment prior

    to reaching sewage treatment facilities.

    ✓To determine the reliability of current stormwater BMPs system.

    ✓Analyze the system to evaluate possibilities and improve reliability of

    system- Moving toward resiliency

    Objective

    Methodology - Reliability

    Reliability is defined to be the probability that a component or system

    will perform a required function for a given period of time when used

    under stated operating conditions.

    Goodness of Fit

    The Anderson–Darling test is a statistical test of whether a given

    sample of data is drawn from a given probability distribution

    Result of Goodness of Fit Test

    Problem

    Description

    Conceptual

    Model

    Use Case

    Model

    Analysis Model

    ( OOAD )

    Design

    Model

    Implementation

    Model

    Test Model

    System Evaluation

    JAD Session

    System Engineer

    Users

    Stakeholders

    Use Case Diagram

    Continuous

    User

    Involvement

    Iterate on Evaluation

    Iterate on Analysis Artifacts of Analysis

    High-Level System Diagram

    Artifact Diagrams

    Used Throughout

    Solution Process

    Problem Definition

    Problem Definition:

    The reliability of system is relatively low.

    The current BMPs cannot prevent overflows. (SSO&CSO)

    Conceptual Model

    object Capture the stormwater

    Strategically design network of BMPs

    BMPs document:Document

    - Requeirments :char

    - Capacity required plan

    - Type of BMPs

    + clarify the requierments() :char

    + support call for policy () :char

    Contractor 1: Contractor

    - Facilities :char

    - Equipment :char

    + Biuld the BMPs() :char

    + Adapt the sewer drains () :char

    Network of BMPs

    - linked by their function :char

    - Capacity- gallon :int

    - Type :char

    - Size-area :int

    + Capture stormwater efficeintly()

    + Avoid flood()

    + Provide water to be used localy()

    + Provide green space ()

    + Provide ecosystem services()

    Researcher 1 : Researcher

    - Knowledge

    - Director

    + Manage other researchers()

    + Collecte data() :char

    + Design() :char

    + Analyze() :char

    DC :City

    - Border :char

    - Stormwater :char

    - Combined Sewer system :char

    - Population :char

    - Sewage :char

    + Ruling the city () :char

    + Build public places() :char

    Stormwater manager: Manager

    - Responsibility for capturing the stormwater :char

    + Managing () :char

    + Policy making () :char

    + Contractor selection () :char

    Stormwater of scope: Stormwater

    - Valume :int

    + Makes CSO() :char

    + Makes SSO() :char

    + Damage city () :char

    Researcher 2 : Researcher

    - Knows models

    + Collecte data() :char

    + Simulate runoff() :char

    + Analyze() :char

    Make problems

    Gives

    misson

    BMPs documents

    «flow»

    Evaluates

    Contracts

    Asks for a

    solution

    Prepars

    Strategically design

    Documents

    «flow»

    Captures

    Builds

    Documents

    «flow»

    uc Primary Use Cases

    Stormwater BMP

    Determine appropriate BMP

    based on the local potential

    Researcher

    Strategically design network

    of BMPs

    Manager

    Contractor Constructe the BMPs

    Simulate the amount of

    runoff for each nod

    City

    «include»

    «include»

    Object-Oriented Model – Network of BMPs

    Hirschman et al. 2008.

    Simulated Stormwater runoff on small scale

    Estimated of runoff reduction by type of BMPs.

    Design capacity and size for network of BMPs.

    Numbers of SSO by the years

    6

    10

    13

    25

    32

    73

    0

    10

    20

    30

    40

    50

    60

    70

    80

    2013 2014 2015 2016 2017 2018

    N u

    m b

    e rs

    o f

    o ve

    rf lo

    w

    Year

    Distribution AD P LRT P

    Normal 0.520 0.108

    Box-Cox Transformation 0.159 0.902

    Lognormal 0.159 0.902

    3-Parameter Lognormal 0.358 * 1.000

    Exponential 0.265 0.838

    2-Parameter Exponential 0.200 >0.250 0.345

    Weibull 0.252 >0.250

    3-Parameter Weibull 0.273 >0.500 1.000

    Smallest Extreme Value 0.708 0.048

    Largest Extreme Value 0.370 >0.250

    Gamma 0.254 >0.250

    3-Parameter Gamma 0.371 * 1.000

    Logistic 0.448 0.205

    Loglogistic 0.181 >0.250

    3-Parameter Loglogistic 0.217 * 1.000

    6 10 13 25 32

    73

    138

    203

    266

    327

    0

    50

    100

    150

    200

    250

    300

    350

    2013 2014 2015 2016 2017 2018 2019 2020 2021 2022

    N u

    m b

    e rs

    o f

    o ve

    rf lo

    w

    Year

    mailto:mojab1@morgan.edu