## Sunday, July 31, 2011

### RDII Parameters for SWMM 5

Subject:  RDII Parameters for SWMM 5

There are three types of RDII Response, six different parameters and an annual and optional twelve monthly sets of distinct parameters.

### RDII Intial Abstraction in SWMM 5

Subject:  RDII Initial Abstraction in SWMM 5

## RDII Initial Abstraction in SWMM 5

Subject:  RDII Initial Abstraction in SWMM 5
The initial abstraction in each of the three components of RDII in SWMM 5 are updated at each time step.  The initialabstraction (ia) is:
ia = iaMax - iaUsed
based on the maximum amount of ia, the ia used (iaUsed), the recovery rate (iaRecov) and the month and class of RDII.  You can enter a value for iaMax, iaInit and iaRecov for each month.

The iaUsed at the beginning of the simulation is set equal to iaInit

and if there is no rainfall

### The Groundwater flow in SWMM 5 Groundwater

Subject:  The Groundwater flow in SWMM 5 Groundwater

## The Groundwater Flow Component in SWMM5

Subject:  The Groundwater flow in SWMM 5 Groundwater
The Groundwater flow in SWMM 5 is actually made up of three components:
1.   groundwater flow computed from the coefficient a1 and exponent b1
2.   groundwater flow computed from the coefficient a2 and exponent b2 and
3.   A Surface Water / Groundwater Interaction coefficient a3
The total Groundwater flow is the sum of the flow from 1, 2 and 3 – normally 2 is the opposite of 1.

## Saturday, July 30, 2011

### Exit, Other and Entrance Loss Values in SWMM 5

Subject:  Exit, Other and Entrance Loss Values in SWMM 5

The entrance, exit and other losses in SWMM 5 are computed at the upstream, downstream and midpoint of the sections of the link.  However, if the normal flow equation is used for the link during a time step then these losses are zero as the flow in the link is based solely on the upstream area and upstream hydraulic radius of the link.   If you add loss coefficients and the normal flow equation is used then you will not see any change in the flow as you modify the loss coefficients.

## Exit, Other and Entrance Loss Values in SWMM 5

Subject:  ExitOther and Entrance Loss Values in SWMM 5

The entranceexit and other losses in SWMM 5 are computed at the upstream, downstream and midpoint of the sections of the link.  However, if the normal flow equation is used for the link during a time step then these losses are zero as the flow in the link is based solely on the upstream area and upstream hydraulic radius of the link.   If you add loss coefficients and the normal flow equation is used then you will not see any change in the flow as you modify the loss coefficients.

### Link Simulated Parameters used in either the Normal Flow or St Venant Equation of SWMM 5

Subject:  Link Simulated Parameters used in either the Normal Flow or St Venant Equation of SWMM 5

St. Venant equation – this is the link attribute data used when the St. Venant Equation is used in SWMM 5.  Simulated Parameters from the upstream, midpoint and downstream sections of the link are used.

Normal Flow Equation – this is the link attribute data used when the Normal Flow Equation is used in SWMM 5. Only simulated parameters from the upstream end of the link are used if the normal flow equation is used for the time step.

## Link Simulated Parameters used in either the Normal Flow or St Venant Equation of SWMM 5

Subject:  Link Simulated Parameters used in either the Normal Flow or St Venant Equation of SWMM 5

StVenant equation – this is the link attribute data used when the StVenant Equation is used in SWMM 5.  Simulated Parameters from the upstream, midpoint and downstream sections of the link are used.
Normal Flow Equation – this is the link attribute data used when the Normal Flow Equation is used in SWMM 5. Only simulated parameters from the upstream end of the link areused if the normal flow equation is used for the time step.

### Green Roof LID Control in SWMM 5

Subject:  Green Roof LID Control in SWMM 5

I saw this on the Daily Dish, http://andrewsullivan.thedailybeast.com/2011/07/roo.html, it is an extremely green roof but a roof that can be simulated in SWMM 5.  You simulated it as a Bio Retention Cell with a Surface, Soil, Storage and an Underdrain to the Gutters of the roof.  You can also have a rain barrel connected to the gutters to storage and drain the rainfall.

## Thursday, July 28, 2011

### Weir and Orifice Flow Equations for a Weir in SWMM 5

Note:  Weir and Orifice Flow Equations for a Weir in SWMM 5

If you use a weir in SWMM 5 then two flow equations are used

1.       The weir uses the weir flow equation when the head at the weir is between the invert elevation of the weir and the crown of the weir and
2.      An orifice equation when the head is above the weir crown or the weir is submerged.

## Weir and Orifice Flow Equations for a Weir in SWMM 5

Note:  Weir and Orifice Flow Equations for a Weir in SWMM 5
If you use a weir in SWMM 5 then two flow equations are used
1.       The weir uses the weir flow equation when the head at the weir is between the invert elevation of the weir and the crown of the weir and
2.      An orifice equation when the head is above the weir crown or the weir is submerged.

# Philadelphia Low Impact Development Symposium

## Greening the Urban Environment

### September 25-28, 2011, Philadelphia, PA

Image courtesy of Philadelphia Water Dept.

#### Sunday, September 25, 2011

9:00am - 4:30pm Pre-Conference Workshops
9:00am - 12:00pm - LID 101: Basic Concepts and Applications
9:00am - 12:00pm - Extensive Green Roof Design for Civil/Stormwater Engineers
1:00pm - 4:30pm - LID 201: Design Guidelines for LID Practices
1:00pm - 4:30pm - Permeable/Pervious Pavement
Pre-Conference Workshops
9:00am - 4:30pm
Commonwealth Rooms

#### Monday, September 26 - Plenary Session

Mr. Howard Neukrug
Commissioner
We are pleased to have Commissioner Howard Neukrug of the Philadelphia Water Department as our Plenary Speaker. Commissioner Neukrug has been the driving force behind the Green City, Clean Waters approach to solutions to the city's Combined Sewer Overflow challenges. Links to the city's plan can be found here:http://www.phillywatersheds.org/what_were_doing/documents_and_data/cso_long_term_control_plan/
Joining Commissioner Neukrug in welcoming the participants will be:
• Robert G. Traver, PhD, PE, WRE, Professor and Director, VCASE and VUSP, Conference Chair
• Tom Davenport - Director, EPA 319 Non Point Source Monitoring Program
• Glen Rider, Director, Bureau of Watershed Management, PA DEP
• Shawn M. Garvin, Administrator for EPA's Mid-Atlantic Region

Photo Courtesy of the Philadelphia Water Department.
Plenary
Monday, 8:30 am
Regency Ballroom

#### Chesapeake Bay Panel - "LID and the Chesapeake TMDL"

Moderator: Robert G. Traver, PhD, PE, WRE
Professor and Director, VCASE and VUSP,
Conference Chair
The purpose of this panel is to discuss the role of LID in meeting the TMDL requirements for Nitrogen and Phosphorus reductions in the Chesapeake Bay. Each panelist will be asked to first make a brief overview of their thoughts on the issue. A moderated discussion will follow based upon submitted questions to the moderator. Please feel free to submit questions prior to the conference to the moderator.
(Image Source – USEPA Chesapeake Bay Program Office)
Panel
9:30 am
Regency Ballroom

#### LID-MARC

Moderator: Bill Hunt, PhD, PE
Associate Professor, NC State University
Conference Co-Chair
Present and Future Directions with LID Research
Bill Hunt, NC State University
Allen Davis, University of Maryland
Robert Traver, Villanova University
Plenary, Cont'd
10:00 am
Regency Ballroom

## Technical Sessions

 Track I Track II Track III Track IV Track V Track VI Track VII Track VIII SCMs I SCMs II Assessing LID Plan & Stnd Cities & Streets Models & CSOs Outreach & Codes 319 & Chesapeake Monday, September 26, 2011 10:50am LID/MARC Monitoring LID Econ I DesStand I Sustain & LID I Filter/Manuf Outreach I 319 I 1:40pm Bioret I Harscape I LID Econ II DesStand II Sustain & LID II Models I Outreach II 319 II 3:40pm Bioret II Hardscape II Metrics DesStand III Streets I Models II Outreach II 319 III Tuesday, September 27 8:30am *5* NonStruct Philly VolRed I Muni Pln I DC 1 CSOs 1 W'shed Pln I Ches Fed 10:55am Bioret III G. Roof I VolRed II Muni Pln II Streets II City Pln I Outreach IV Panel 1:45pm Bioret IV G. Roof II Attenuat'n City Pln II Streets III Models III Regs & Code I 319 IV 3:45pm Media G. Roof III Extreme LID City Pln III Streets IV Models IV Regs & Code II 319 V Wednesday, September 28 8:30am *5* O & M W. Harvest I Ecology W'shed Pln II DC II CSOs II Transprt I Case Studies 10:55am W. Harvest II Campus Climate Ch Transprt II CSOs III Regs & Code III 319 VI

#### Wednesday, September 28, 2011

Field Tours - 1:00 - 4:30pm
Tour A - Villanova Urban Stormwater SCM Research and Demonstration Park
Tour B - Reinventing the Neighborhood (PWD)
Tour C - Urban LIDs (PWD)
Tour D - Stroud Preserve and Stroud Water Research Center 319 NPS National Monitoring Site
Field Tours
1:00pm - 4:30pm

Updated July 18, 2011

### HOW TO USE GIS GATEWAY IN INFOSWMM TO CREATE BOTH DATA AND MODEL RESULTS SHAPEFILES

GIS Gateway – Create Shapefile T he Create Shapefile tool available from the  GIS Gateway , allows you to create a new ESRI® Shapefile dir...