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Transcript of Ssa Presentation
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2011 Autodesk
Drainage Design and Analysis with
Autodesk Storm and Sanitary Analysis (SSA)
Steve StamatoplosCivil Technical Specialist
Engineering, Natural Resources, Infrastructure
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2010 Autodesk, Slide 2
Introduction and Overview
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2010 Autodesk, Slide 3
SSA History
Background
Autodesk, Inc. acquired certain assets of
BOSS International, including BOSS
StormNET Stand-Alone technology
Launched it as Autodesk Storm and
Sanitary Analysis Stand-Alone 2011
Now included with Infrastructure DesignSuite, Civil 3D, and Map 3D
Development
Software developed from latest version of
EPA SWMM engine
Additional Hydrology methods
Easy to use GUI
Advanced Profile Plot
Addition of FHWA HEC-22 Inlets, Neenah
Foundry, and Caltrans
Interoperability with Autodesk Products
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Interoperability
In order to more seamlessly sharedata with other software, SSA
provides the following
interoperability:
AutoCAD DWG Support
GIS Shapefile Support
LandXML Import & Export Import & Export of Hydraflow Storm
Sewers Extension files (*.stm)
Import & Export EPA SWMM Models
Import & Export XPSWMM Models
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2010 Autodesk, Slide 5
Engineering Background
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2010 Autodesk, Slide 6
Hydrologic Capabilities of SSA
SSA includes the following hydrologymethods to determine drainage area runoff:
US EPA SWMM
Rational Method
Modified Rational Method
DeKalb Rational Method
NRCS (SCS) TR-20
NRCS (SCS) TR-55
Santa Barbara Unit Hydrograph (SBUH)
US Army Corps HEC-1
UK Hydrology (Wallingford Procedure
Modified Rational Method)
Project Options
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2010 Autodesk, Slide 7
Hydraulic Capabilities of SSA
SSA includes the followinghydraulic routing methods:
Steady Flow
Kinematic Wave (default
method)
Hydrodynamic
Project Options
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2010 Autodesk, Slide 8
Hydrodynamic Routing
Most sophisticated routing method Solves the complete 1-D Saint Venant flow
equations to produce the most accurate
results
Accounts for pressurized flow, channelstorage, backwater effect, entrance and exit
losses, adverse slope conduits, looped
network
Force Mains are modeled using Hazen-
Williams or Darcy-Weisbach equationsAppropriate for any network analysis, method
of choice for systems subjected to backwater
effects
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2010 Autodesk, Slide 9
Defining a Network Model
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2010 Autodesk, Slide 10
SSA Stormwater Model Representation
Model is constructed using thefollowing elements:
Subbasins
Nodes
Links
Rainwater (called precipitation) falls
onto subbasins
Runoff occurs within the subbasin,
and then enters a downstream
node (or another subbasin if using
EPA SWMM hydrology)
Nodes are connected togetherusing links
Links allow water to travel (called
routing) from node to node
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2010 Autodesk, Slide 12
Node Elements
Nodes are a generic term used to representmany nodal type elements
Junction
Manholes (storage accounted as 4 ft manhole)
Computational point along a link, like along a stream or
internally within a pipe
Storm drain inlets (catchbasins)
Storage nodes
Detention ponds
Other storage type nodes where water is stored (e.g.,
junction box)
Outfalls
Nodes are computational points in the model
where WSEL is computed at each time step
Locations where flow can enter the network
(inflows) or leave the network (outflows)
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2010 Autodesk, Slide 13
Link Elements
Links are a generic term used torepresent many link type elements
Conveyance Link
Pipe
Open channel (i.e., river, stream, ditch, gutter)
Pump
Orifice
Weir (spillway)
Outlet
Links allow flow to be transported
(routed) from node to node
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2010 Autodesk, Slide 14
Civil 3D and SSA Workflow
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2010 Autodesk, Slide 15
Typical Workflow With Civil 3D
Layout storm system in Civil 3D (rules applied to design system in 3-dimensions)
Establish subbasins for storm system in Civil 3D (use catchment object
tool, water drop tool)
Edit System in SSA
Define project and analysis options Connect gutters, Refine model as necessary
Run the analysis
View analysis output results
Adjust pipe sizing as necessary to handle the analyzed storms
Export the file to .STM from SSA
Import the file into Civil 3D
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2010 Autodesk, Slide 16
.STM File Interoperability Notes
Parts Conversion is based onPart Matching Settings within a
set Parts List
OR
User can allow part family
swapping (including custom
parts) via Pipe Network Feature
Settings
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2010 Autodesk, Slide 17
Hydraflow/SSA Differences
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2012 Autodesk
Portfol io Differences
Hydraflow
Extension
Simple SCS DesignMethods, Simple
Hydrology
Simple HydraulicCalculations,
Standard Step
Peak Flow
Storm and SanitaryAnalysis (SSA)
Continuous Rainfall,Design Methods, Complex
Hydrology
Complex HydraulicCalculation
Dynamic Wave
Continuity
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2012 Autodesk
Side-by-Side
Hydraflow
FHWA HEC-22 Chapter 4Inlet Calculations
No capability
Hydrographs: Pond and ChannelRouting
SSA
FHWA HEC-22 Chapter 4
Custom Performance Curves
Neenah Inlets
Pumps & Forcemains,
Flow Reversal,
Back-pitched pipes
Pond Routing, Overland,Channel Flow Routing of pipe
network
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2010 Autodesk, Slide 20
Storm Sewer
Modeling and Analysis
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2010 Autodesk, Slide 21
Drainage Analysis
In this example, you will see how to: Model and analyze storm sewer networks in Civil 3D and Storm
and Sanitary Analysis
Use tools SSA to set Project and Analysis options and
methodologies to accurately analyze the system
Produce reports summarizing the design and analysis of drainage
systems
Bring analyzed and adjusted network back to Civil 3D to update the
design model
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2010 Autodesk, Slide 22
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2010 Autodesk, Slide 24
Detention Pond
Modeling and Analysis
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2010 Autodesk, Slide 25
Pond Design & Analysis
In this example, you will see how to: Model and analyze detention basins in Civil 3D and Storm and
Sanitary Analysis
Use tools in Civil 3D and Storm and Sanitary Analysis to determine
site hydrology for a number of methodologies
Produce reports summarizing the design and analysis of
stormwater management basins
Account for current regulatory requirements, such as infiltration
Drainage with SSA
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2010 Autodesk, Slide 26
Overview of Workflow
In Civil 3D, prepare pond surface for stage storage analysis
Run stage storage tool and create table
Setup storage node in SSA file
Create a storage curve based on data from Civil 3D
Establish elevations of storage node
Create an emergency spillway in SSA
Model an outlet structure with an orifice and weirs
Configure exfiltration
Run analysis and review results
Detention Ponds in Civi l 3D and SSA
Drainage with SSA
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2010 Autodesk, Slide 27
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