I have recently had the opportunity to extend my modeling capabilities by learning SWMM5.  The training that I went through was a web-based course offered by Computational Hydraulics International (CHI), who offers their own SWMM software toolset that goes by the name of PCSWMM.  The training included the following SWMM capabilities and uses:

-Hydrologic routing using RADAR, rain gages, or synthetic events.

-Steady state and dynamic  hydraulic modeling of piped and open channel networks.

-Event-based and continuous modeling.

-Detention pond design.

-Land use – based water quality modeling and evaluation of best management practices (BMPs).

-Sanitary sewer dry weather flow (DWF) and rainfall derived inflow and infiltration (RDII).

-Sensitivity, calibration, and error analysis.

Tags: , , , , , ,



time-logoTime Magazine has a story about a request by the Army Corps of Engineers that the EPA and FEMA not disclose the location of coal ash ponds.  It seems that the EPA and FEMA were assessing the hazard posed by these ponds after a spill in Kingston, Tennessee that covered 300 acres in sludge and destroyed or damaged 40 homes on December 22, 2008.  Since then, it has been concluded that 44 of these ponds across the country, used to store waste from coal fire power plants, pose a high hazard to the surrounding public.  After making this assessment public, the Corps of Engineers requested that the EPA and FEMA not disclose the location of these ponds, much as the National Dam Inventory had been removed from public access after 9/11.  The reason for both of these moves is, of course, to make it more difficult for terrorists to identify good targets.

The problem with this approach of making hazards confidential is that it does nothing to remedy the original threat.  The high hazard coal ash ponds and dams are still out there and people are still vulnerable with or without the aid of terrorism.  Will anyone be moved to do anything about these hazards if the public does not know the danger they are already in?  Admittedly, the high hazard status does not necessarily mean that these structures are an imminent threat to fail, but necessary supervision and maintenance is much easier to put off if the public is not aware of its importance.  Doesn’t this more mundane and everyday threat trump the extraordinary one of terrorism?  Moreover, would public knowledge lead to construction of fewer of these high hazard structures in the first place, thus making the terrorism concern moot in the first place?  It’s something to consider.

Tags: , , , , , , , ,



Lisa Jackson, center, head of the U.S. Environmental Protection Agency, tours IJburg, a residential district built on reclaimed land in Amsterdam, Netherlands, Tuesday May 26 2009.  (AP Photo/Peter Dejong)

Lisa Jackson, center, head of the U.S. Environmental Protection Agency, tours IJburg, a residential district built on reclaimed land in Amsterdam, Netherlands, Tuesday May 26 2009. (AP Photo/Peter Dejong)

With the high cost of maintenance and the variability of its implementation, rising seas, and changing weather patterns, many are questioning the use of artificial flood control measures such as levees or dykes.  Instead, flood control has come to mean either avoiding the floodplain altogether, or developing it in a way that accommodates the natural flood pattern.  At least that is what has happened in the Netherlands, a place that was largely created by holding back the seas, and it seems that the Obama Administration may be coming around to the idea itself.  Lisa Jackson, head of the US EPA indicated as much during a recent trip to the Netherlands.  It also seems to be the thinking in Louisiana as this was the third trip that Senator Mary Landrieu (D-La) has made since Katrina.  There has been no word yet if this means that New Orleans will be jacked up on stilts or made to float with the rising water, but it wouldn’t be a bad idea.  In any case, the idea of restoring floodplains to their natural state has caught on with some US municipalities as shown in this testimony: Viewpoint: Protecting the Flood Plain.

Tags: , , ,