tag:blogger.com,1999:blog-1675184707067447729.post7880732968237472175..comments2023-07-12T07:12:04.697-07:00Comments on The RAS Solution: Extending your Cross Sections to High Ground?Chris G.http://www.blogger.com/profile/00354834185663924786noreply@blogger.comBlogger16125tag:blogger.com,1999:blog-1675184707067447729.post-1297019109739485942018-07-02T15:36:04.851-07:002018-07-02T15:36:04.851-07:00I think it's a common issue of using the ESRI ...I think it's a common issue of using the ESRI ArcObjects incorrectly in HEC-GeoRAS. You may need to get a new version HEC-GeoRAS compatible with your ESRI ArcGIS.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-91949933687165957762018-07-02T05:05:55.860-07:002018-07-02T05:05:55.860-07:00I think that's a HEC-GeoRAS bug. It happens wh...I think that's a HEC-GeoRAS bug. It happens when it reads the table or featureclass using a cursor without releasing the memory attached to the cursor after finishing the job. You could download a latest version of HEC-GeoRAS compatible with your ESRI ArcMap.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-70046728573901468092018-05-18T01:41:07.397-07:002018-05-18T01:41:07.397-07:00I also encountered the same problem while calculat...I also encountered the same problem while calculating lengths/stations. Any help? Anonymoushttps://www.blogger.com/profile/13366244354039052563noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-23359363196386600052018-03-12T12:24:44.986-07:002018-03-12T12:24:44.986-07:00I'm encountering the same problem, when calcul...I'm encountering the same problem, when calculating lengths/stations to my stream centerline. What do I do? Have you found a solution?Anonymoushttps://www.blogger.com/profile/14053769422636281460noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-78368189712452970462018-03-12T12:23:23.470-07:002018-03-12T12:23:23.470-07:00Im encountering the same problem, when calculating...Im encountering the same problem, when calculating lengths/stations with HEC-GeoRAS to my stream centerline. What do I do? Have you found a solution? Anonymoushttps://www.blogger.com/profile/14053769422636281460noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-35097963407042776592017-11-14T08:20:21.592-08:002017-11-14T08:20:21.592-08:00Allan-
1. Yes.
2. No. Just reimport it into th...Allan-<br /><br />1. Yes.<br />2. No. Just reimport it into the geometry file. If you maintain the same river stationing, RAS will know to replace the old cross sections with the new ones. <br />3. Cross sections are drawn left to right, from the perspective of looking in the downstream direction. Stream centerlines are drawn from upstream to downstream. As long as you follow these rules, you'll be good. <br />4. Not really. It is what it is. <br /><br />Good luck!<br />ChrisChris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-75694628982289110702017-11-14T06:01:01.110-08:002017-11-14T06:01:01.110-08:00Hi Chris!
In your statement here:
"If your R...Hi Chris!<br /><br />In your statement here:<br />"If your RAS geometry is already set up in GIS and your terrain model extends far enough laterally, you could simply extend the cross section cut line to the high ground and reimport into RAS. Easy!"<br /><br />Questions:<br />1.Do you mean that I just have to open the geometry file in GIS and manually extend the cross sections I considered that needs to reach hh ground using hec-georas?<br />2.Will it not cause any problem in creating the cross section lines and upon importing it to hecras?<br />3.Are the 'extension xs lines' needed to follow the direction of drawing it upstream to downstream?<br />4.If I have to do it to all the cross section lines I initially had from a previous project. Is there a way to speed up the process? Or would you suggest that I just recreate every xs line?<br /><br /><br />Thanks for all the help!<br /><br />- Allan ReyesAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-47708731763236446852016-11-14T11:14:37.960-08:002016-11-14T11:14:37.960-08:00HI J. I'm not sure what that is. I've ne...HI J. I'm not sure what that is. I've never seen it. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-29808974372561907592016-11-09T12:15:06.897-08:002016-11-09T12:15:06.897-08:00Chris,
I am setting up my geometry using HEC-geoR...Chris,<br /><br />I am setting up my geometry using HEC-geoRAS. After creating the ineffective flow areas polygon, when I select the 'Ineffective Flow Areas - Positions' options, I get the following weird error:<br />"-2147467259, Cannot open any more tables."<br />Have you ever encountered this before? Is there a solution? Any suggestions or help are appreciated. <br />Also, my apologies if this is not the correct place to post this question.<br /><br />Thanks,<br />JAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-40926792682386131242015-05-18T18:10:47.623-07:002015-05-18T18:10:47.623-07:00Thank you so much Chris!!!!Thank you so much Chris!!!!Anonymoushttps://www.blogger.com/profile/02870430847877264589noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-82996649217376782752015-05-18T08:15:02.446-07:002015-05-18T08:15:02.446-07:00In this case the time it takes for water to travel...In this case the time it takes for water to travel the 10 km becomes important. You will set up a hydraulic gradient lateral to the axis of the main channel. Here I would suggest not extending your cross sections for 10 km, but rather put in storage areas to cover the flood plain extents. Even better, use a 2D area, then you'll be able to model the lateral gradient and progression of the flow through the floodplain. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-43065308039489754622015-05-17T13:57:35.551-07:002015-05-17T13:57:35.551-07:00One more question please..
In a small depth river...One more question please..<br /><br />In a small depth river (about 1,5 meters depth) the W.S. rises above banks for 0.5 meter (or less) but the left and right overbanks are straight and extending 5km both sides (flat land), so the cross section needs to extend 10km to find hιgh ground. Its an agriculture area with same manning values both sides of the river. <br /><br />Is there any possibility the flood plain to extend 10km?? In steady flow lets say ok..but for unsteady i think not!! HEC says that it would extend. What is your opinion in this case?Anonymoushttps://www.blogger.com/profile/02870430847877264589noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-50919137615177820682015-03-16T08:15:11.082-07:002015-03-16T08:15:11.082-07:00In that case, I'd say do you best to approxima...In that case, I'd say do you best to approximate how the floodplain extends out away from the river. If nothing else, Google Earth can give you very rough approximations of elevation and distance. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-36830500655958795762015-03-13T15:52:55.083-07:002015-03-13T15:52:55.083-07:00..And what happens if we dont have topographic map.....And what happens if we dont have topographic maps (Europe) and the terrain data hasn't high ground on both sides to capture the floodplain? Do you suggest editting cross sections..something like moving the 2 or 3 points higher from the W.S. ?<br /><br />One more great article..Thanks!!Anonymoushttps://www.blogger.com/profile/02870430847877264589noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-11984169610390186782015-01-14T16:15:39.869-08:002015-01-14T16:15:39.869-08:00Thanks!Thanks!Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-48070875166334203812015-01-13T12:57:27.216-08:002015-01-13T12:57:27.216-08:00Excellent article, Chris!
RobertExcellent article, Chris!<br />RobertAnonymoushttps://www.blogger.com/profile/18202132680522836875noreply@blogger.com