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 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 Toolbars Study Area Map Data/Map Browser 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 Larger characteristic width produces higher peak and shorter runoff hydrograph duration Runoff Ti Time

 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 Q A 0 x t ◦ Momentum

 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

 Watershed/Catchment/Subcatchment Level NOTE: This delineation is for illustration purposes only since the subcatchment boundaries were delineated arbitrarily.

 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 Maximum Buildup for Power Function Saturation Exponential Options: 1. Power: 3. Saturation: 2. Exponential: 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