WinSLAMM v 9.4 User`s Guide Introduction

WinSLAMM v 9.4 User`s Guide Introduction
WinSLAMM v 9.4
User’s Guide
Start-Up Hints
**Press F1 on any screen within the program to
see the corresponding Help File Topic**
**Throughout this User’s Guide, the text in red
walks you through the program**
**The User may need to press Enter in various
input screens to activate the next data input**
Introduction Summary
Basic Program Structure
Data Entry
Running the Program
Introduction &
*.DAT File Construction
Introduction – Basic Program Structure
Land Uses. There are six land uses defined by
the model, listed in Table 1 below. To evaluate a
land use, you must define source areas within the
land use using numeric values corresponding to
the area, in acres, of the source area and the
appropriate parameters for the source area, as
Table 1. WinSLAMM Land Uses
1. Residential Land Uses
2. Institutional Land Uses
3. Commercial Land Uses
4. Industrial Land Uses
5. Other Urban Land Uses
6. Freeway Land Uses
Introduction – Basic Program Structure
Source Areas. Each source area listed in Table 2 below has
specific data requirements, or parameters, that depend upon
the characteristics of the source area and upon the source
area's land use. These parameters include the area (acres),
the roof slope, the drainage system connection type, the soil
type, building density, and alleys. Not all parameters apply
to each source area (see model documentation for details).
Table 2. WinSLAMM Source Areas
Impervious Areas
Freeway Lanes/Shoulders
Paved Parking/Storage
Unpaved Parking/Storage
Other Impervious Areas
Pervious Areas
Large Landscaped Areas
Large Turf Areas
Undeveloped Areas
Small Landscaped Areas
Other Pervious Areas
Medium Density
Residential Land Use
Residential Land Use
Residential Land Use
Source Areas
Pitched Roofs
Small Landscaped Areas
Source Areas
Pitched Roofs
Small Landscaped Areas
Low Density Residential
Land Use
Storm Sewer
Grass Swale
Land Use
Strip Commercial
Land Use
Commercial Land Use
Source Areas
Flat Roofs
Small Landscaped Areas
This schematic
depicts the
layout of the
levels of the
program and
various source
Other Urban
Land Use
Source Areas
Large Landscaped
Introduction – Basic Program Structure
Runoff Volumes and Particulate Loading Calculations. Runoff
volume and particulate loadings from all source areas for each land
use are calculated, treated by appropriate source area controls,
summed, and routed to the drainage system. They may be treated
by any of the applicable control devices (e.g. grass swales or
catchbasins) for the drainage system. The resulting runoff and
particulate loadings are then routed to the outfall, where they may
be treated by any of the applicable outfall control devices.
Parameter Files. The model also uses parameter files (or support
files) to determine runoff, particulate, and pollutant loading. These
parameter files include:
Rainfall Data
Runoff Coefficient Data
Particle Size Data
Particulate Solids Concentration Data
Particulate Residue Reduction Data
Street Delivery Data
Pollutant Distribution Data
Entering Data…
The following is an introduction to entering the data described
in the last few slides into model. It assumes that you have
read the model documentation that describes, in detail, the
data requirements of the model as well as the model
limitations. Data requirements and model limitations are
detailed in the Help File.
Prior to creating your own model, you must:
1. Identify your basic modeling objectives, such as examining
alternative land development options, comparing different
stormwater management alternatives, or calculating loadings
for different subdrainage basins in a watershed.
2. List the basic characteristics of the areas to be modeled,
such as location, area, time frame, land uses, and stormwater
3. Understand the objectives of the modeling activities, the
limitations of the model, and the needed accuracy of the
Start the Program
Select. . .
to get to the . . .
Main Data Window
Main Menu
Data File Name
Current Source Area
This is the Main Data Window. All features in
the program can be accessed through this
window. A summary of the data currently
entered in the program can also be found here.
Active Land Use Area Summary
Exit Program
Enter Parameter Files
To edit rainfall dates,
parameter files, and the
drainage basin characteristics,
select ‘Current File Data …’.
Current File Data
Select the ‘Edit’ buttons to
Enter or Change values
Enter the Seed. A seed value >1 activates the Monte Carlo simulations for the
pollutant loadings. A seed value = 0 randomly generates a seed value based on the
clock time a model begins. A seed value <0 turns off the Monte Carlo simulation.
The Monte Carlo simulation only affects the loads for the pollutants, not particulate
solids or runoff volume.
Using the Monte Carlo simulation will result in more accurate simulations due to the
inherent randomness found in the environment, however, it will not produce
repeatable results.
Therefore, if repeatable results are desired, the user should use a seed < 0. This will
calculate the pollutant loadings based on the average pollutant value found in the
pollutant probability distribution file.
Rain File
Enter the Rain File. The
Start and End Dates will
fill in automatically
based on the first and
last dates found in the
rainfall file. The user
can exclude periods the
rain fall file (for
example, the winter
season) by changing the
Start and End Dates.
Winter Season Range
To use the Winter Season Range option, check the box and
enter the start and end of the winter season, as month and date.
Note: enter the start of winter first (ex. 12/03), then the end of
winter (ex. 03/12).
When a Winter Season is used, the following occurs: 1) there is
no activity in the model during the winter season range entered,
2) street cleaning starts on the day the winter season ends, and
3) the initial street dirt loading due to winter is populated in the
street source area.
Current File Data
Parameter Files, Cost File, and Drainage
System Data are listed here.
Street Delivery Files
To enter the Street Delivery (.std)
Files, select a Land Use (LU)
button and then press the ‘Edit’
button. Select the desired .std file
and Select ‘Open’. Then select the
next Land Use button to enter the
next .std file.
This is the land use button
Street Delivery Files
Continue entering .std files until
each land use has one.
This is the land use button
Street Delivery Files
Or, if there is only one land use modeled in
the .dat file, the user can select the ‘Change
all Street Delivery Files to Match the
Current File’ button. This will enter the
same .std file for all land uses.
Cost Estimation Option
To perform a cost analysis on the control
practices, check the ‘Use Cost Estimation
Option’ box and press the ‘Select Cost Data
File’ button to select a cost file.
This topic is discussed further in the Advanced
Features User’s Guide.
Defining the Drainage System
To define the Drainage System, select the
‘Edit’ Button for the Drainage System
Defining the Drainage System
Define the drainage system by selecting
the fraction of each type of drainage
system that serves the study area.
When creating a new file, even if you have
swales, enter a “1” in the other drainage
system type describing the remainder of
your system. Once you enter the swale
data, the program will automatically
recalculate the fractions.
For example, if you have 50% swales and
50% Curb and Gutters in Fair conditions,
enter a “1” in Curb and Gutters in Fair
Condition. After you enter the swale data,
the program will change the fractions to
0.5 and 0.5.
Review Current File Data Status
To Review the Current File
Data Status, select this button
Current File Data Entry Status
The ‘Current File Data Entry
Status’ window tells you if all
required data necessary for the
model run has been entered. It
only indicates that all the
necessary fields have data in
them. It does not indicate that
the information is complete nor
that the model is correctly set
Entering Source Area and Parameter Data
To enter Source Area data
for a land use, select ‘Land
Use’, then select the desired
land use.
Entering Source Areas
To enter data for a Source Area,
double-click on the desired
Source Area in any of the
following three columns:
1.‘Source Area’,
2.‘Area (acres)’, or
3.‘Source Area Parameters’
After double-clicking in one of
the three columns, you will be
prompted to enter the Area, in
acres, of the Source Area, and . .
Source Area Parameters
. . . enter the Source Area Parameter data. The
window below illustrates the type of data that
most Source Areas require.
Note: To delete a Source Area, enter “0” (zero) in
the Area (acres) screen and press Enter.
Street Source Area Parameters
This window
illustrates the data
required for Street
Source Areas.
The street length can
be defined in terms of
curb-miles or street
width. The program
will automatically
calculate the
corresponding length
or width.
Freeway Source Area Parameters
This window
illustrates the data
required for
Freeway Source
Pollutant Selection
To select the
pollutants that you
want to analyze,
select ‘Pollutants’
from the main
menu. Then check
the pollutants that
you want to
analyze in the
Pollutant Selection
Note: Particulate
Solids is always
Saving Down a Version
To save and run
the data file in an
earlier version,
Select ‘File’, then
‘Save As Earlier
Version…’, then
select the desired
File/Output Options
To select an
output option, go
to ‘File/Output
Options . . .’
Output Format Options
There are Eight Output
Options, as well as:
•Additional information
about wet detention pond
•An option to create input
data for a WinDETPOND
analysis, and
•An option to save the model
output for input into the CEQUAL-RIV1 model.
Execute the Program
Select Run/Calculation Module
Select ‘Save File and Execute’ to run the *.dat file.
If you want to rename the file before you run it, select ‘Save
File with a Different Name and Execute’.
For Additional
Information See . . .
The Context-Sensitive Help in the Program
For help on any window or on
other WinSLAMM modeling
topics, press the F1 key. You
will get help information
about the current window as
well as the option to select
topics from the Help Topics
Index. This example is the
help topic that appears when
you select F1 from the main
Model Documentation Included on the CD
•WinSLAMM Introduction and Basics
•Integration of Water Quality and Design Objectives
•Sources of Stormwater Pollutants
•Stormwater Quality Controls in WinSLAMM
•Using SLAMM
•Biofiltration Example
•Detention Pond Design
•National Stormwater Quality Database (NSQD,
version 1.1)
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