Manila Third Sewerage Project

EPA SWMM5 Theory and Hands-On TutorialHenry 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:\SWMMTraining◦ Copy files from the CD \SWMMTraining folder to

C:\SWMMTraining folder

Run SWMM Setup Program (c:\SWMMTraining\EPASWMM5\swmm5022_Setup.exe)◦ Note that your computer may restart after installation

Launch EPA SWMM5 program ◦ Program is installed normally at c:\Program Files\EPA

SWMM 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 Help >>Tutorial 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

Time

Larger characteristic width produceshigher peak and shorter runoff hydrographduration

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 = 1000/CN – 10S= infiltration capacity

Q = (P-0.2S)^2/(P+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

0t

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 ConcentrationQi = Inflow RateQ = Outflow RateV = VolumeK = First Order Decay CoefficientL = 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 subcatchmentboundaries 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 >> Details 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 duration1.0, 1.7 and 3.7 in totalamount, 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