tag:blogger.com,1999:blog-1675184707067447729.post4045172592567045687..comments2023-07-12T07:12:04.697-07:00Comments on The RAS Solution: Dam Breach Modeling Q & AChris G.http://www.blogger.com/profile/00354834185663924786noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-1675184707067447729.post-20597991779042586172018-07-02T08:29:32.778-07:002018-07-02T08:29:32.778-07:00Hi, I'm modeling a dam break analysis. The mo...Hi, I'm modeling a dam break analysis. The model appears to be set up correctly and I am not receiving any errors. However, when I run the model the dam breach does not contribute to any additional flow into the downstream channel. Any thoughts?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-35705212039510076972012-11-29T09:23:04.773-08:002012-11-29T09:23:04.773-08:00Hi Alex- It could be any number of things. Can yo...Hi Alex- It could be any number of things. Can you email me your model? Use the Chris G. link. Send the .prj, .p, .u, and .g files. Chris G.https://www.blogger.com/profile/00354834185663924786noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-2460085698735359972012-11-29T08:32:57.800-08:002012-11-29T08:32:57.800-08:00Hi I'm modeling a dam break, using a storage a...Hi I'm modeling a dam break, using a storage area to model the lake upstream the dam (two cross sections - Inline Structure - downstream cross sections). This is my first time doing this, so I've received support for the parameters I have to use.<br />The thing is that the model runs correctly for a period of time (32hs), but when I extend the period something happens and the simulation goes unstable. I don't change but the time period and the error comes up on the cross section just upstream the dam.<br />Before I noticed this, I cut the river lenght for the simulation to be faster and simplified the cross sections beyond the width needed...Still discarding options and trying to trace the error....Sorry if it is a dumb question, my name is Alex hydraulic civil engineer asking for a door...the rest is on me.<br />Thanks in advance, greetins from Mza, AR!Anonymoushttps://www.blogger.com/profile/14922394731867060805noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-2407185402156969802012-06-21T09:10:45.473-07:002012-06-21T09:10:45.473-07:00Hi Ron. Yes, definately. RAS is very flexible in...Hi Ron. Yes, definately. RAS is very flexible in that way.Chris G.https://www.blogger.com/profile/00354834185663924786noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-62842185507383839372012-06-20T17:28:50.129-07:002012-06-20T17:28:50.129-07:00Is it feasible to model an upstream dambreak into ...Is it feasible to model an upstream dambreak into a downstream reservoir+dam with dam gates on timed opening(case is a PMF+dambreak)in HEC-RAS. Like DAMBRK (Boss3) Options 12 or 14)Ron Kilmartinhttp://hydroinsure.comnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-39781962099434229242011-12-20T06:43:56.611-08:002011-12-20T06:43:56.611-08:00You must make sure that an equilibrium condition i...You must make sure that an equilibrium condition is properly defined. In other words, inflow to the reservoir equals outflow from the reservoir. It sounds to me that you have some kind of outlet flow, but nothing coming into the reservoir. Try a lateral inflow hydrograph to the storage area with a constant discharge = to whatever outflow you have.Chris G.https://www.blogger.com/profile/00354834185663924786noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-26491294520908934242011-12-20T06:26:15.243-08:002011-12-20T06:26:15.243-08:00When I am running a level pool reservoir, the wate...When I am running a level pool reservoir, the water level behind the dam (Upstream) is reducing. In practical this will not happen. How can I eliminate this problemBalahihttps://www.blogger.com/profile/12333918602260550522noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-33706188178257920392011-10-10T13:27:09.447-07:002011-10-10T13:27:09.447-07:00Definately. If you can produce an elevation-volum...Definately. If you can produce an elevation-volume curve for the manhole or catch basin, you can model it as a storage are in HEC-RAS. The tricky part is modeling how the water gets there from the river/stream. For a catch basin, I suppose the best technique would be to use a lateral structure that defines the conveyance from the river/stream to the catch basin. Manholes are trickier, since they are typically associated with storm water designs (underground conveyances, curb and gutter, etc.). HEC-RAS is not meant to be used for stormwater design. If you're talking about flooding of an urban area and including the added storage manholes provide, then yes, definately use them.Chris G.https://www.blogger.com/profile/00354834185663924786noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-33361556428940619992011-10-10T12:35:29.613-07:002011-10-10T12:35:29.613-07:00Does anyone know if it is acceptable to model catc...Does anyone know if it is acceptable to model catch basins or manholes as a "storage area" in Hec-Ras?Unknownhttps://www.blogger.com/profile/18131047115947688346noreply@blogger.com