Wednesday, June 25, 2008
- Subcatchment Runoff
- Subcatchment Washoff
- Node Water Depth
- Link Flow Rate
- Node Water Quality
- Node Lateral Inflow
- Node Flooding
- Groundwater Flow
- Groundwater Elevation
- Snow Pack Depth
- Link Flow Depth
- Link Flow Velocity
Series Elapsed Time (hours) Flow CFS
Computed 0.1667 0.0000
Observed 0.0167 0.0000
Sunday, June 22, 2008
The Joys Of Non-Driving
22 Jun 2008 09:33 pm
It proves I'm not an American, I guess, but I still don't know how to drive, don't have a license and have managed to get to the age of 44 without missing one. Yes, the husband has to drive us all the way to Ptown each summer, but once I get here, even more than when I'm in DC, this sentiment by C.S. Lewis rings all the more true:
I number it among my blessings that my father had no car, while yet most of my friends had, and sometimes took me for a drive. This meant that all these distant objects could be visited just enough to clothe them with memories and not impossible desires, while yet they remained ordinarily as inaccessible as the Moon. The deadly power of rushing about wherever I pleased had not been given me. I measured distance by the standard of man, man walking on his two feet, not by the standard of the internal combustion engine. I had not been allowed to deflower the very idea of distance; in return I possessed "infinite riches" in what would have been to motorists "a little room."
The truest and most horrible claim made for modern transport is that it "annihilates space." It does. It annihilates one of the most glorious gifts we have been given. It is a vile inflation which lowers the value of distance, so that a modern boy travels a hundred miles with less sense of liberation and pilgrimage and adventure than his grandfather got from traveling ten. Of course if a man hates space and wants it to be annihilated, that is another matter. Why not creep into his coffin at once? There is little enough space there.
$4 gas? Maybe it will be good for us.
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Saturday, June 21, 2008
SKIP_STEADY_STATE, TEMPDIR, IGNORE_RAINFALL, //(5.0.010 - LR)
FORCE_MAIN_EQN, LINK_OFFSETS, //(5.0.012 - LR)
The good feature about this message is that it tells you what MAY be different between the two SWMM versions. For example, if you used Link Offsets in v13 then you will not have a valid model in SWMM 5.0.011. However, if you are not using a new option in SWMM 5.0.013 then you will have a valid backwards compatible SWMM 5.0.011 input data set.
Sunday, June 15, 2008
These are the Delphi 7 options that should be used to prevent the integer overflow problem from occurring when using the Zoom command. Overflow checking and any Debugging options seem to be the cause of the integer overflow problem.
A charming little rain garden shines on Mt. WashingtonA lovely little rain garden has showered a once blighted corner on Mt. Washington, a splash of green that its creators’ hope may become a catalyst for sprinkling similar projects around Pittsburgh.
Pittsburgh’s Burt Hill dreamed up the idea pro bono as a way to expand the firm’s professional knowledge and investigate emerging environmental technologies for urban water runoff, explains Evaine Sing, graduate landscape architect. The project has become a labor of love on a 2,000 square foot parklet on the corner of Shiloh Street and Virginia Avenue.
Mt. Washington Community Development Corp., URA Mainstreets Pittsburgh Fund and Pittsburgh Public Works have assisted along the way and $10,000, labor and material donations were contributed by community members and local businesses including Shemin Nurseries and KMA/Landscape Forms.
“We wanted a project of our own that would work as a test kitchen for other projects and be a living example for our clients,” explains Sing. “We choose this site across from the CDC because we saw the potential for educating passersby on these sustainable methods.”
The park was subdivided into small ecosystems and plants were selected for their ability to absorb water and pollutants during rainstorms. Bioretention beds and vegetated swales will allow the garden to drain within 2 days, helping to absorb and prevent storm water runoff, explains Sing.
Other touches will include lighting, a plaza space, benches, stepping stones made from the recycled pavers, an electrical outlet for future concerts and a mural that will be created by Cory Bonnet.
“We’d love to see this kind of space happen more often in Pittsburgh, like 10,000 Rain Gardens in Kansas City, which has had an amazing impact on water quality and flooding,” adds Sing. “We hope the idea will spread.”
Writer: Debra Smit
Source: Evaine Sing, Burt Hill; Greg Panza, MWCDC
Image courtesy Burt Hill
Saturday, June 7, 2008
The new method is a linear combination or slider that weights the value of A and R in the St. Venant Equation based on the value of rho (), or
where, Rho () is a function of the Froude number. The effect of this addition is that as the Froude number increases from 0.5 to 1.0 and beyond the area and hydraulic radius used as the pivot point in the St. Venant equation moves from the midpoint of the link to the upstream end of the link. When the Froude number is above 1.0 the St. Venant and Normal Flow equation both use the same cross sectional area and hydraulic radius which makes for a more stable model.
Just for reference, the equation for Qnorm or the Manning's Equation flow is
The equations for the calculation of Rho () as a function of the Froude Number (Fr) are:
If ALL of the follow conditions are true Rho ()is calculated:
- the pipe is not full,
- h1 >= h2, and
- qLast > 0.
h1 is the head at the upstream end of the link,
h2 is the head at the downstream end of the link and
qLast is the last flow value in the link.
If any of these conditions are true then rho = 1.0 and the value of A and R are the values Amid and Rmid, respectively.
The next graph shows the relationship between Rho and the Froude Number.
The value of Awtd and Rwtd move from the midpoint of the link to the upstream end of the link as the Froude number increases from 0.5 to 1.0.
Conclusion: This change should make the solution more stable because there is no longer an oscillation between the St. Venant Equation A and R and the Normal Flow Equation A and R.
How to Use the SWMM 4 Dos Enginengine
- SWMM Engine Name Name of the SWMM 4 DOS Engine
- SWMM Input File - SWMM 4 Input file
- SWMM Output File - SWMM 4 Text Output File (.OUT Extension)
- Alternative SWMM Output File - Reduced SWMM 4 Output File (.RPT Extension)
How to Use the SWMM 5 Dos Engineine
- SWMM Engine Name Name of the SWMM 5 DOS Engine (usually called SWMM5.EXE)
- SWMM Input File - SWMM 5 Input file
- SWMM Output File - SWMM 5 Output Binary Graphics File (.OUT Extension)
- Alternative SWMM Output File - SWMM 5 Output Text File (.RPT Extension)
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