LD15697 - Get Real: Using AutoCAD Civil 3D & Storm and ...

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LD15697 - Get Real: Using AutoCAD Civil 3D & Storm

and Sanitary Analysis to Prepare EPA SWMM Models

Robert WardEnvironmental Designer

© 2016 Autodesk© 2016 Autodesk

By the end of this class you will know how to

use Civil3D with freely available GIS data to

build an EPA SWMM model from the ground

up for projects located anywhere in the world,

including hacks for open channels,

bioretention cells, infiltration trenches, and

more.

Class summary


At the end of this class, you will be able to:

Organize and manage GIS to CAD to SWMM data workflows

Draft and model open channel networks

Draft, calculate, and model SWMM subasins

Design, calculate, and model BMPs

Key learning objectives


1.0 Introduction


1.1 About Your Speaker

LEED AP

Civil 3D Certified Professional

Revit Certified Professional

Revit Structure Certified Professional

Revit MEP Certified Professional

ArcGIS 10.3 Certified Professional

10+ years in Design-Engineering Field

7+ years in China

Adjunct Faculty at Tongji University

Published in academic journals


1.2 About Hyphae Design Lab

Hyphae (pl. noun): The fine, weblike, branching tubes which make up

the body (or mycelium) of a multicellular fungus, responsible for

symbiotically sharing nutrients between soil and plants.

The Hyphae Design Laboratory is

an ecological engineering and

design firm dedicated to creating

an innovative green infrastructure.


1.3 Esalen Institute

Esalen was founded to fully realize

what Aldous Huxley had called the

"human potentialities". Through

the years, Esalen became the

center of the New Age movement.-wikipedia


2.0 Hydrology Overview


2.1 Why is this so difficult challenging

“Stormwater management is as

much an art as a science,

requiring judgement in the use of

available data and calculations”-Timesaver Standards For Landscape Architecture


2.2 Hydrology

SPACE + TIME + MASS


2.3 Rainfall to Runoff Calculation

INPUT > TRANSFORM > OUTPUT


2.4 Routing

Routing is Combining Hydrographs

Two Options in SWMM:

- Kinematic Wave (approximate)

- Hydrodynamic (exact St-Venant)


2.5 Why SWMM?

Rational

Modified Rational

MODFLOW

TR-55

HEC-1TR-20

HEC-2

HSPF

SWATSWMM

UK Rational MIKE11

HEC-HMS


3.0 Open Channels


3.1 The SSA Node Object

Invert

Water Surface Elevation (WSEL) Initial

Rim

Ponded Area

Surcharge

De

pth


3.2 How Channel Sections Work

Section

Junction

The Real World:

What SSA “Sees”:


3.3 Live Demo!


4.0 Subasins


4.1 Subasins

Slope

Len

gth

Equivalent Width

Area


4.2 Subasins Physical

Slope

Len

gth

Are

a 1

Are

a 2

SWMM Time Of Concentration Method:

Equivalent Width = (2-Skew)*L

Skew Factor = (A2-A1)/(A2+A1)-SSA Manual p341

Equivalent Width


4.3 Subasins Material

Material Properties

Loss: SCS Curve Number 0-98

Velocity: Manning’s n value 0-1

Paved Surface Fraction: 0-100%


4.4 GIS Data


4.5 Document Object Model

Keeps like files together

“Toolspace” in Civil3D

“Plan View” in SSA

Use folders to make your own

DOM

STM

SHP

SDF

Root Folder


4.6 Live Demo!


5.0 Best Management Practice


5.1 BMP to Storage Node

SWMM models what happens

between BMPs not what happens

inside BMPs

1. Design each BMP geometry

2. Volumetric calculations

3. Use this data to populate

storage node data

4. Complex BMPs may need

multiple nodes

5. The outlet structure is the key

control


5.2 Storage Nodes

Represent BMP by:

-Storage (by curve)

-Infiltration Loss

-Evaporation Loss

-Transmission (routing)

-Treatment

Outlet

Storage

Evaporation

Exfiltration

Inlet

De

pth


5.3 Storage Curves

Functional Equivalence

-All SSA ‘sees’ is depth

vs volume

-Void Space is ‘equal’ to

a smaller area

=De

pth

De

pth

60%

60%


5.4 Complex BMPs

These are tricky to

model because:

-Both surface and

underground storage

or

-Filter media

or

-Move water

(transmission)

or

-All of the above

=60%

Example: Infiltration Trench as a volume

that pours across a long weir into a gutter

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LD15697 - Get Real: Using AutoCAD Civil 3D & Storm and ...

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