http://www.flo-2dforum.com/ Forum for FLO-2D users en-US Wed, 08 Feb 2012 15:18:27 +0000 http://bbpress.org/?v=1.0.2 q http://www.flo-2dforum.com/search.php http://www.flo-2dforum.com/topic/importing-street-geometry#post-77 Tue, 07 Feb 2012 15:55:29 +0000 meric 77@http://www.flo-2dforum.com/ <p>Is there any way to import street geometry from dwg or shp file? </p> http://www.flo-2dforum.com/topic/levee-length-vs-flo-2d-levee-length#post-76 Thu, 01 Dec 2011 22:08:37 +0000 Karen 76@http://www.flo-2dforum.com/ <p>A new feature of the GDS helps account for flow overtopping a levee. When the user assigns the levee by polygon over a long distance, then the actual portion of the levee in the grid element may be shorter than the Levee component. The levee component length is assigned using the GE Width * 0.41412 (this is the length of the octagon side). For example, if a grid element has a levee assigned to 3 directions, the levee crest length is 3 x 0.41412 x GE Width. If the physical levee is a straight line across the grid element the calculated discharge length could be too long. </p> <p>The discharge computed over a broadcrested weir (Q = C*L*H^1.5 and L would be the levee crest length) This length might be too long using all three sides. This can be corrected by adding a WRF value to the side of the grid element. The GDS does this automatically for the "polylines" by computing the entire length of the levee and assigning the appropriate WRF value to the individual grid elements. </p> http://www.flo-2dforum.com/topic/what-computer-system-should-i-use-with-flo-2d#post-60 Fri, 29 Apr 2011 16:58:21 +0000 Karen 60@http://www.flo-2dforum.com/ <p>FLO-2D will run on Windows XP, Vista and 7 with a 32-bit or 64-bit OS. We recommend that you purchase a 64-bit system with at least 4 processor cores. Processor speed is a very important consideration. The Intel(R) Core(TM) processor has shown remarkably faster run-time speeds over less efficient processors. </p> <p>For very large projects, gaming computers have proven to be effective at decreasing the total simulation time. They typically have the best computing processors and graphical processors. </p> <p>We’ve also seen an decrease in simulation time by turning off hyper-threading. </p> http://www.flo-2dforum.com/topic/interopolate-from-multiple-elevation-files-option-overlapping-flt-files#post-71 Fri, 07 Oct 2011 21:24:22 +0000 Pani R 71@http://www.flo-2dforum.com/ <p>I have used this oprion to assign elvations from multiple overlapping binary flt grids. GDS seems to be assigning the elevations correctly and overlapping doesnot seem to create any problem. Is this an valid assumption?. what would you recommend?</p> <p>Thank you so much </p> http://www.flo-2dforum.com/topic/levee-express-editor-duplicate-levee-segment-removal#post-70 Thu, 25 Aug 2011 02:21:02 +0000 Pani R 70@http://www.flo-2dforum.com/ <p>Hi, I was working on integrating two levee files (intersecting levees)that had some duplicate levee segments. When I removed the first duplicate levee segment using "Levee Express Editor",FLO-2D removed all the duplicate instances. I'm excited about (but I was not aware before of) this capability. I would like to know more about the procedure that FLO-2D uses to resolve the duplicate levee segments.</p> <p>Thank you </p> http://www.flo-2dforum.com/topic/floodplain-channel-flow-exchange-text-reporting-clarification#post-65 Thu, 28 Jul 2011 19:45:56 +0000 Pani R 65@http://www.flo-2dforum.com/ <p>Hi, I'm modeling a depressed roadway about 1250 ft long and at about 15 feet deep at the lowest point compared to the surrounding floodplain elevation. The roadway is cutting through a railroad embankment modeled as levee 6 ft tall compared to the floodplain elevation. The depressed roadway starts at the floodplain elevation about 600 ft upstream of the railroad and keeps getting deeper until right below the railroad crossing and then starts rising in depth until getting back to the floodplain elevation in about 600 ft downstream of railroad crossing.</p> <p>I'm modeling the depressed roadway as rectangular channel and its width is 2 ft less than the octagonal side of the cell. The flow between two sides of the railroad embankment is only through the channel and the 2 ft floodplain.</p> <p>As expected, on both the upstream side and downstream side, there is a lot of floodplain-channel flow exchange. I also have put two one- element floodplain cross-sections: one on the upstream channel cell and the other on the downstream channel cell.</p> <p>My questions are<br /> (1) is the modeling approach valid? My results suggest that the hydraulic behavior is reasonable.<br /> (2) flow depths reported in Base.out, Hycross.out, hychan.out and other out files, do they report the depths before the floodplain-channel exchange or after the exchange? The results I have suggest that the reported depths are before the exchange, if so, is there a way to obtain the depths after the floodplain-channel exchange?</p> <p>Thank you </p> http://www.flo-2dforum.com/topic/animating-flo-2d-results-using-gdsrun-files#post-63 Wed, 06 Jul 2011 19:29:56 +0000 Pani R 63@http://www.flo-2dforum.com/ <p>Hi, is there a way I can animate FLO-2D run results using GDSRUN.### files (previously genetated by FLO-2D during a run with "Animate within GDS" option was chosen)?. Can this be readily done by Mapper or other executables? This would really help in presenting the results.</p> <p>Thank you </p> http://www.flo-2dforum.com/topic/hydraulic-structures-rating-table-discharge-vs-available-discharge#post-61 Wed, 18 May 2011 22:34:59 +0000 john@jefuller.com 61@http://www.flo-2dforum.com/ <p>What does FLO-2D do if the rating table for a hydraulic structure (e.g., culvert) indicates a structure discharge which is greater than the availabe incoming supply of flow from grids surrounding the inlet node? For example, the structure rating table specifies 100 cfs flow in the structure @ 4 foot depth at the inlet node, but the available inflow that corresponds to a depth of 4 feet at the inlet node is only 50 cfs. </p> http://www.flo-2dforum.com/topic/floodplain-roughness#post-58 Thu, 28 Apr 2011 18:32:15 +0000 john@jefuller.com 58@http://www.flo-2dforum.com/ <p>I was wondering if you could clear up some confusion for me. I have been under the impression for some time that the floodplain roughness cannot be reduced below 0.1 for shallow flow conditions, regardless of the AMANN setting. But some new info circulating in our office suggests that setting AMANN to -0.99 and SHALLOWN to 0.00 will cause the model to use ONLY the roughness values in FPLAIN.DAT (i.e., no adjustment at all). Can you confirm? Thanks! </p> http://www.flo-2dforum.com/topic/hydraulic-structures-and-model-run-time#post-56 Thu, 28 Apr 2011 17:04:22 +0000 Alan 56@http://www.flo-2dforum.com/ <p>I have been adding hydraulic structures to one of my models. I have been noticing since I have done that, my model time steps have gone from 7 - 8 seconds a time step to 0.003 seconds or worse per a time step. One Model is small in area, has modestly sized grid cells, and would run in less than three hours to get through a 14-hour simulation. With the addition of two hydraulic structures, the model has now been running for over 24 hours and has only made it through 1.5 hours of simulation time. Does anyone have any tricks to improve the time steps with hydraulic structures? At the current model run rate, the model will run for 13 days. I guess I am having a problem understanding why the model run times would see a 100-fold increase by adding rating curves for two structures. Any help will be greatly appreciated! </p> http://www.flo-2dforum.com/topic/batch-mode#post-39 Fri, 28 Jan 2011 15:50:04 +0000 cameronj 39@http://www.flo-2dforum.com/ <p>I need to run Flo-2D over 20 times and would like to do this over night. The problem is that when the model is done running a window pops up asking if I want to save the data for future runs. I am not sure how to bypass this window so once one run is done the next one starts. Anyone have any ideas? I need to be able to do this with both the 2006 and 2009 versions. </p> http://www.flo-2dforum.com/topic/riverflo-2d-2011#post-49 Mon, 07 Feb 2011 19:07:07 +0000 Luis 49@http://www.flo-2dforum.com/ <p>I need to know if it will be a version 2011 of Riverflo-2D. I am waiting for a update which uses normal water level like Hec Ras uses. </p> http://www.flo-2dforum.com/topic/interpolation-limit#post-47 Wed, 02 Feb 2011 23:11:49 +0000 cameronj 47@http://www.flo-2dforum.com/ <p>I am trying to interpolate a ascii grid I created in GIS from a 5 ft DEM into a grid in GDS. When I try the new method of doing it, none of the cells get any values when it is finished. Is there a limit to the amount of points? The DEM covers 65 square miles and the ascii grid file has 80 million values. The current grid I am using has 200 ft grid cells but I may have to drop it down to 100 ft grid cell sizes. </p> http://www.flo-2dforum.com/topic/changing-hydrographs-for-multiple-runs-quickly#post-35 Wed, 22 Dec 2010 22:09:12 +0000 Alan 35@http://www.flo-2dforum.com/ <p>I have an urban system where I am running several hydrographs. I have a model set up and running. I would like to create multiple model runs to look at the 2 year, 5 year, 10 year, 25 year, and 100 year flows. The inflow node locations will not change from one model to teh next but the hydrograohs will. Is there a way to quickly change hydrographs without going to each cell and re-reading in teh new hydrograph&gt; </p> http://www.flo-2dforum.com/topic/applicability-for-coastal-engineering#post-33 Wed, 10 Nov 2010 20:23:41 +0000 Canada 33@http://www.flo-2dforum.com/ <p>Hi,</p> <p>I'm thinking about buying FLO-2D for Floodplain mapping study.<br /> I would like to know if this software can be successfully used to perform Hydrodynamic study (e.g. Breakwater design in a coastal area) ? </p> <p>Thanks, </p> http://www.flo-2dforum.com/topic/extracting-xyz-data-from-gis#post-32 Thu, 04 Nov 2010 16:29:59 +0000 Chris Dusza 32@http://www.flo-2dforum.com/ <p>I have some GIS files and am able to extract masspoints, contour, and breakline shapefiles. The orgiinal data is lidar. I can read the contour shapefile into FLO2D but when I go to interpolate elevations, the model can not find any elevation data. How do I extract XYZ points from the GIS files? </p> http://www.flo-2dforum.com/topic/discharge-results-on-the-floodplain#post-30 Mon, 25 Oct 2010 02:24:51 +0000 Karen 30@http://www.flo-2dforum.com/ <p>To measure the discharge across a series of floodplain grid elements, use a floodplain cross section. The floodplain cross section is set up in the GDS. It records a hydrograph of time vs. discharge for a series of grid elements and a selected flow direction. </p> <p>Create a floodplain cross section in the GDS by clicking the Tools menu and selecting Create Floodplain Cross Section. Draw the floodplain cross section by using the click and drag method to paint a series of cells. The cells must be contiguous and in a straight line. They can be vertical, horizontal or oblique. Double click to finish the line. The next step is to add a flow direction. Click the cross section and click Edit Floodplain Cross Section. Assign a general flow direction and click OK. Save the FLO-2D files to create a file called FPXSEC.DAT. </p> <p>When the next simulation is run, the flow across the cross section will be recorded in three files CROSSQ.OUT, CROSSMAX.OUT and HYCROSS.OUT. These data files can be accessed directly with a text editor such as WordPad(TM) or UltraEdit(TM). The results can be viewed graphically in the HYDROG program.</p> <p>For more information on creating floodplain cross sections and the HYDROG post processor program see the DATA Input Manual (Chapter 4: FPXSEC.DAT tab and Chapter 6: Post Processor Programs: HYDROG. </p> http://www.flo-2dforum.com/topic/limiting-computational-boundary-with-small-grid-size#post-24 Thu, 21 Oct 2010 20:33:19 +0000 bbucholtz 24@http://www.flo-2dforum.com/ <p>I have elevation points (in random order) for an entire town. This is about 42 square miles and over 3 million points. These do successfully import into the GDS. This creates a large and slow file.</p> <p>I only need to model reaches on the order of 1 or 2 square miles, and I would be fine with multiple smaller files. I need a small grid size (~25 feet). Since a grid system needs to be created before a computational boundary, I get a "Not Enough Memory" error when trying to do so.</p> <p>To my knowledge, there is no way to clip the project area in the GDS. How would you suggest I could continue this project? </p> http://www.flo-2dforum.com/topic/mannings-coefficients#post-21 Tue, 12 Oct 2010 22:13:35 +0000 MGamble 21@http://www.flo-2dforum.com/ <p>Manning's values are input for the channel cross sections and manning's values are input for each grid element, including those that may contain a channel or a portion of a channel. Is the Manning's value assigned to the grid element with a channel or portion of a channel in it used for the floodplain portion of that grid element only or does it override the Mannings value assigned to the cross-section? Or am I missing something else completely? </p> http://www.flo-2dforum.com/topic/varying-grid-cell-size-within-an-existing-model-domain#post-19 Tue, 12 Oct 2010 17:29:54 +0000 rama 19@http://www.flo-2dforum.com/ <p>I have a model with 100 ft x 100 ft size grid cell. Is it possible to change the grid size of the model (to 50 ft x 50 ft) over a selected area within the model domain so that the flow in that area can be modeled in more detail.</p> <p>The model has several inflow hydrographs input at different locations. Is it possible to reduce the grid size of the entire domain keeping the existing hydrograph inputs in position (ie. without re-entering the input hydrograph data? </p> http://www.flo-2dforum.com/topic/adding-grid-cells-to-an-existing-grid#post-17 Tue, 14 Sep 2010 23:47:06 +0000 alex.herting 17@http://www.flo-2dforum.com/ <p>Good afternoon,</p> <p>I am working on a project in Maricopa County with an existing model. There is some extra topo available that will reduce the effect of overtopping a dike around cell 2820 to 2891. I was hoping I could just add the small area to the model without having to re-create the entire grid since there are over 26,000 cells. If possible, we would also like to keep the existing cell numbers the same. Certain cell numbers are included in our drainage report in which changing the cell numbers would add a bit of work. If not, what is the best way to add a small section to an existing grid?</p> <p>I can put the model on an FTP site if you need me to. It was about 8 MB zipped without .out files. Just let me know. Thank you!</p> <p>FLO-2D Version 2009.06 </p> http://www.flo-2dforum.com/topic/mapper-time-plots-velocity-vs-time#post-12 Mon, 30 Aug 2010 16:26:51 +0000 rama 12@http://www.flo-2dforum.com/ <p>The time plots of velocity using Mapper gives maximum velocities that are much lower than the maximum velocities indicated in the grid element maximum velocity plots and in the maximum velocity contours. Could you provide some guidance to fix this problem? I would like to get a time plot of velocities where the maximum value in the time plot is the same as that indicated in the contours/grid element plots. </p> http://www.flo-2dforum.com/topic/fill-a-reservoir#post-14 Tue, 31 Aug 2010 00:10:16 +0000 Karen 14@http://www.flo-2dforum.com/ <p>To simulate a filled reservoir in FLO-2D, make a reservoir element in the INFLOW.DAT file. In the GDS simply right click any element within the boundary of the reservoir and click 'Reservoir Water Elevation for Element ****'. Then enter the water surface elevation of the reservoir and click OK. Once the model is executed, the FLO-2D will search for all grid elements contiguous to the element selected and give them an initial depth based on the water surface elevation that was specified. That’s how to fill a pond, detention basin, reservoir. To test the reservoir for leaks (elements that allow the water surface to extend beyond the reservoir boundary) just run the model for .01 hours and view the max depth results in Mapper. The plot should be a single water surface elevation for each grid element within the reservoir area. </p> http://www.flo-2dforum.com/topic/webinars#post-11 Wed, 19 May 2010 00:54:45 +0000 Karen 11@http://www.flo-2dforum.com/ <p>The FLO-2D and RiverFLO-2D Webinars were held on the 19th and 20th of May, 2010. These were promotional webinars. If you have an interest in a educational webinar please reply to this post and list a topic or topics of interest. </p> http://www.flo-2dforum.com/topic/which-flo-2d-product-do-i-need#post-9 Mon, 17 May 2010 02:06:54 +0000 Karen 9@http://www.flo-2dforum.com/ <p>Software:<br /> If you are new to FLO-2D, you need to purchase a New Model license. That is product #1 on the shop page. If you are a current user with a license for v2007, purchase a Subscription Service. If you are a user of a version earlier than 2007, purchase an Update.</p> <p>Manuals:<br /> You are not required to purchase manuals and they are available in electronic form in the FLO-2D folder. I personally like using them because of the ease of access.</p> <p>Mapper.Net:<br /> This program maps the FLO-2D results using ESRI ArcGIS Runtime 9.2. It is NOT a mandatory purchase and the original Mapper comes standard with the software. You must have an ArcGIS license to run the program. It makes awesome maps of your FLO-2D results.</p> <p>DFIRM Tool:<br /> This program makes Digital Flood Insurance Rate Maps for FEMA. If you are not making DFIRM maps, you don't need it. If you are living outside the USA, you don't need it. It works directly from Mapper. </p> <p>FEMA Project License:<br /> This product is necessary as part of your FEMA submittal or if you want to provide an editable copy of a model to another party. Don't purchase this project thinking you are getting a good deal on the model.</p> <p>If you still have questions, Ask Away!!</p> <p>Karen </p>