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Showing posts from July, 2011

RDII Parameters for SWMM 5

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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 Parameters for SWMM 5by dickinsonreSubject:RDIIParameters for SWMM5 There are three types of RDII Response, six different parameters and an annual and optional twelve monthly sets of distinctparameters.

RDII Intial Abstraction in SWMM 5

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Subject:  RDII Initial Abstraction in SWMM 5
RDII Initial Abstraction in SWMM 5by dickinsonreSubject:RDIIInitialAbstraction in SWMM5 The initialabstraction in each of the three components of RDII in SWMM5 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


via Blogger http://www.swmm5.net/2013/08/rdii-initial-abstraction-in-swmm-5.html

The Groundwater flow in SWMM 5 Groundwater

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Subject:  The Groundwater flow in SWMM 5 Groundwater
The Groundwater Flow Component in SWMM5by dickinsonreSubject:  The Groundwaterflow in SWMM5Groundwater The Groundwaterflow in SWMM5 is actually made up of three components: 1.   A groundwaterflowcomputed from the coefficient a1 and exponent b1 2.   A groundwaterflowcomputed from the coefficient a2 and exponent b2 and 3.   A Surface Water / Groundwater Interaction coefficient a3 The total Groundwaterflow is the sum of the flow from 1, 2 and 3 – normally 2 is the opposite of 1.

via Blogger http://www.swmm5.net/2013/08/the-groundwater-flow-component-in-swmm5.html


Exit, Other and Entrance Loss Values in SWMM 5

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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 5by dickinsonreSubject:Exit, Other and EntranceLossValues in SWMM5
The entrance, exit and otherlosses in SWMM5 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 …

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

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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 5by dickinsonreSubject:LinkSimulatedParametersused in either the NormalFlow or StVenantEquationof SWMM5
St. Venantequation – this is the link attribute data used when the St. VenantEquation is used in SWMM5.  SimulatedParameters from the upstream, midpoint and downstream sections of the link are used. NormalFlowEquation – this is the link attribute data used when the NormalFlowEq…

Green Roof LID Control in SWMM 5

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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.


Weir and Orifice Flow Equations for a Weir in SWMM 5

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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 5by dickinsonreNote:Weir and OrificeFlowEquations for a Weir in SWMM5 If you use a weir in SWMM5 then two flowequations are used 1.       The weir uses the weirflow 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. via Blogger http://www.swmm5.net/2013/08/weir-and-orifice-flow-equations-for.html


Philadelphia Low Impact Development Symposium

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Philadelphia Low Impact 
Development Symposium
Greening the Urban Environment September 25-28, 2011, Philadelphia, PA Image courtesy of Philadelphia Water Dept. HomeProgramAbstract SubmissionRegistrationContact Us
Sunday, September 25, 20119:00am - 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 Workshop descriptions can be found by clicking here.