EPA SWMM5 Theory and Hands-On Tutorial Henry Manguerra GEF-MTSP - - PowerPoint PPT Presentation

Manila Third Sewerage Project

EPA SWMM5 Theory and Hands-On Tutorial

Henry Manguerra GEF-MTSP Consultant August 3-4, 2011

 EPA SWMM5 Setup Program (Version 5.0.022)  SWMM Powerpoint Presentation Materials  SWMM User’s Manual  SWMM Application Manual  Map Windows Setup Program (Version 4.7.5)  Sample Project and Data Files

• GIS
• Time Series Data
• SWMM Project Files
• MapWindow Project Files

 SWMM - First developed in 1971  Globally used for planning, analysis and design

primarily for urban areas

• Stormwater runoff
• Combined sewers
• Sanitary sewers
• Other drainage systems

 SWMM Version 5

• Major version release by USEPA National Risk

Management Research Laboratory (NRMRL)

• Integrated environment

 Preparing input data  Running hydrologic, hydraulic, and water quality simulations  Viewing of results in time series graphs and tables, profile plots, and statistical frequency analysis

 Hydrologic

• Time-varying rainfall
• Surface water evaporation
• Interception and depression storage
• Infiltration, percolation, and interflow
• Overland flow routing

 Hydraulic

• Steady and unsteady flow
• networks of unlimited size and network elements such

as storage/treatment units, flow dividers, pumps, etc.

• Natural channels and closed and open conduit shapes
• Backwater, surcharging, reverse flow, and surface

ponding

• External flow time series from runoff, groundwater

interflow, dry weather sanitary flow, and user-specified flows

 Water Quality

• Dry-weather pollutant buildup over different land

uses

• Pollutant washoff during storm events
• Direct contribution of rainfall deposition
• Best management practices, treatment, and natural

decay processes

• Contribution of dry weather sanitary flows and

user-specified external inflows

• Water quality routing

 Drainage systems design for flood control  Floodplain mapping  Designing control strategies for minimizing

combined sewer overflows

 Evaluating impact of inflow and infiltration on

sanitary sewer overflows

 Generating nonpoint source loadings for load

allocation studies and TMDL

 Evaluating effectiveness of BMPs for reducing

wet weather pollutant loadings

 System Requirements

• IBM/Intel-compatible personal computer
• Windows 98/NT/ME/2000/XP/Vista/7
• Very minimal memory, disk space, CPU requirements

 Copy CD Files to Computer HardDrive

• Create new folder C:\SWMM

MMTrai Trainin ing

• Copy files from the CD \SWMM

WMMTrain ainin ing folder to C: C:\SWM SWMMTrain MTrainin ing folder

 Run SWMM Setup Program

(c:\SWMMTraining\EPASWMM5\swmm5022_Setup.ex e)

• Note that your computer may restart after installation

 Launch EPA SWMM5 program

• Program is installed normally at c:

c:\Pro rogram ram Files es\EPA EPA SWMM MM 5.0 HANDS-ON EXERCISE STOPPING POINT

 SWMM’s User’s Manual Chapter 2 pp. 7-32

• C:\SWMMTraining\epaswmm5_users_manual.pdf

 From SWMM User Interface click He

Help >>Tu Tutorial torial from the Main Menu

Main Menu Data/Map Browser Toolbars Study Area Map Status Bar

 User’s Manual Sections 2.1 – 2.2  Learning Objectives

• Create a new project
• Set default options for

 Naming conventions  Default object property values (catchment, nodes, links)  Map/Drawing options

• Tip: Always Save your project: Click File >> Save As from the

main menu and then navigate to the SWMM Folder (c:\SWMMTraining\SWMMData) and save the file as tutorial.inp.

HANDS-ON EXERCISE STOPPING POINT

Appendix A, p. 159 User’s Manual

 Catchment = Nonlinear Reservoir  Catchment capacity (dp) = Depression storage  Computes water balance over time

 Surface area and characteristic width  Percent imperviousness  Manning’s roughness coefficient for pervious

and impervious surfaces

 Infiltration Model

• Horton
• Green-Ampt
• Curve number

 Initial estimate = Area / longest flow path  Key calibration parameter for surface runoff

Runoff Ti Time

Larger characteristic width produces higher peak and shorter runoff hydrograph duration

 Overland flow  Table A.6, User’s

Manual)

 Horton  Green-Ampt

 NRCS (SCS) Curve Number

• Table A.4, User’s Manual)
• Table also provides

imperviousness estimates for types of urban areas

S = 10 1000 00/CN – 10 10 S= infiltra tration tion ca capac acity ity Q Q = ( (P-0. 0.2S 2S)^2 ^2/(P /(P+0.8 0.8S)

 Node Invert  Conduit Geometry  Conduit Roughness  Routing Model

• Steady State
• Kinematic Wave
• Unsteady (Fully Dynamic)

 Longitudinal slope is computed from invert elevations of

upstream and downstream nodes

 Table 3.1,

User’s Manual

 Table A.8,

User’s Manual

 St. Venant Equations

• Continuity Equation
• Momentum

t A x Q

 Steady  Kinematic Wave

• Simplified Momentum Equation (slope of water

surface = channel longitudinal slope

 Dynamic Wave

• Completely solves momentum equation
• Simulate adequately backwater effects, flow

reversal, pressurized flow, entrance/exit losses

 Continuous Stirred Tank Reactor (CSTR) -

Perfect/ideal mixing

C = Concentration

Ci – Inflow Concentration Qi = Inflow Rate Q = Outflow Rate V = Volume K = First Order Decay Coefficient L = Pollutant Source/Sink

 User’s Manual Sections 2.3  Learning Objectives

• Create/draw a network of catchments, nodes, and

conduits

• Tip: Save your project: Click File >> Save from the main

menu.

HANDS-ON EXERCISE STOPPING POINT

NOTE: This delineation is for illustration purposes only since the subcatchment boundaries were delineated arbitrarily.

 Watershed/Catchment/Subcatchment Level

 Development Site/Urban Drainage Network –

Combined Sewer System

 User’s Manual Sections 2.4  Learning Objectives

• Link catchments with their outlet nodes
• Associate catchments with climate stations
• Modify default property values of catchments,

nodes, and conduits

• Create a rainfall time series input
• Tip: Save your project: Click File >> Save from the main menu.
• Tip: View the input file created thus far by selecting Project

ct >> Detai ails from the main menu.

HANDS-ON EXERCISE STOPPING POINT

 Continuous or event-based (e.g. design

storm)

 Rainfall value: intensity, volume, cumulative

volume

2-hour duration 1.0, 1.7 and 3.7 in total amount, respectively

 User’s Manual Section 2.5  Learning Objectives

• Setting general simulation options

 Modules (Rainfall-Runoff, Flow Routing, Water Quality, Groundwater, Snowmelt)  Period of simulation and time step

• View results

 Status report  View simulation results  View profile plot

• Tip: Save your project: Click File >> Save from the main menu.

HANDS-ON EXERCISE STOPPING POINT

 User’s Manual Section 2.6  Learning Objectives:

• Specify pollutants to be analyzed
• Enter land use data by subcatchment
• Formulate pollutant buildup-washoff functions for

each land use

• Tip: Save your project: Click File >> Save from

the main menu

HANDS-ON EXERCISE STOPPING POINT

Power Exponential

Maximum Buildup for Power Function

Saturation Options:

• 1. Power:
• 2. Exponential:
• 3. Saturation:
• 4. Time Series

Options: 1. Exponential: 2. Rating Curve: 3. EMC: W = CQ

Table A.9 User’s Manual

 User’s Manual Section 2.7  Learning Objectives

• Use an external file as input for historical rainfall

record

• Perform statistical frequency analysis of results

 Tip: Rainfall file sta310301.dat is located in the SWMM Training CD  Tip: Save your project: Click File >> Save from the main menu.

HANDS-ON EXERCISE STOPPING POINT

 Standard formats produced by U.S. and

Canadian agencies

 User-specified format

 Station ID Year Month Day Hour Minute NonZeroRainfall