amirrhm Posted January 14 Share Posted January 14 Hello everyone I have the flood zone in AutoCAD with different return periods, normally the 25-year zone should not be bigger than the 500-year zone, but still, in some places in my file, the 500-year zone goes into the 25-year zone, and if If I want to correct these ranges manually, it will take a lot of time, especially for long ranges. Can you please help me for this? Maro(2&25&500).dwg Quote Link to comment Share on other sites More sharing options...
BIGAL Posted January 15 Share Posted January 15 (edited) Its odd that the flood mapping crosses, to me it is a sign that the generation has been done at different times for flood intervals. Given the way a flood map is generated, it is possible that a different surface model has been used for different intervals. The big issue is do a flood analysis set it going when you leave work and hope its done by start of work next day. So I would look at where the information came from stuff like different grid spacing in model generation could produce the dwg. Edited January 15 by BIGAL 2 Quote Link to comment Share on other sites More sharing options...
amirrhm Posted January 15 Author Share Posted January 15 Hello Yes, it is strange for me too. I obtained this zone with the hec-ras software, but now due to mapping errors or other reasons, it shows me the results like this, which I have to manually correct. For me, the flood zone is 25 years old. It is more important than 2 and 500 years, that's why I base the 25 year band and modify the other two bands based on it. But I need lispy or a solution to speed this up Quote Link to comment Share on other sites More sharing options...
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