topic CN Grid Creation in Water Resources Questions https://community.esri.com/t5/water-resources-questions/cn-grid-creation/m-p/752236#M3847 <HTML><HEAD></HEAD><BODY><SPAN>I???m working with HEC-GeoHMS to perform the operation of building a CNGrid.&nbsp; It is a HMS Project View Utility function.&nbsp; I performed it successfully about four months ago on my project.&nbsp; Now I have a new landuse/soil shape file and CNLookUp table for a built out watershed.&nbsp; I get an APFramework error that says ???Required/MustExist Field: Value is not found ??? CNLookUP???.&nbsp; I have been over the table enough times to know nothing is missing.</SPAN><BR /><SPAN>The CN field is generated in the attribute table for the Landuse_Soil file but all the values are zero.&nbsp; Any suggestions?</SPAN><BR /><SPAN>FYI - I tried to rebuild the grid that was done successfully last fall and got the same error message.</SPAN></BODY></HTML> Wed, 23 Mar 2011 13:14:09 GMT AnnScholz 2011-03-23T13:14:09Z CN Grid Creation https://community.esri.com/t5/water-resources-questions/cn-grid-creation/m-p/752236#M3847 <HTML><HEAD></HEAD><BODY><SPAN>I???m working with HEC-GeoHMS to perform the operation of building a CNGrid.&nbsp; It is a HMS Project View Utility function.&nbsp; I performed it successfully about four months ago on my project.&nbsp; Now I have a new landuse/soil shape file and CNLookUp table for a built out watershed.&nbsp; I get an APFramework error that says ???Required/MustExist Field: Value is not found ??? CNLookUP???.&nbsp; I have been over the table enough times to know nothing is missing.</SPAN><BR /><SPAN>The CN field is generated in the attribute table for the Landuse_Soil file but all the values are zero.&nbsp; Any suggestions?</SPAN><BR /><SPAN>FYI - I tried to rebuild the grid that was done successfully last fall and got the same error message.</SPAN></BODY></HTML> Wed, 23 Mar 2011 13:14:09 GMT https://community.esri.com/t5/water-resources-questions/cn-grid-creation/m-p/752236#M3847 AnnScholz 2011-03-23T13:14:09Z Re: CN Grid Creation https://community.esri.com/t5/water-resources-questions/cn-grid-creation/m-p/752237#M3848 <HTML><HEAD></HEAD><BODY><SPAN>I am new to hec-geohms and my problem is in the generation of the CN grid. I have already the needed input data, e.g. soil-landuse union/integration, lookup table and the "fil" dem. Running these inputs for CN grid would generate a grid with zero (0) values. I would Appreciate any expert advice.</SPAN><BR /><BR /><SPAN>Thank you.</SPAN><BR /><BR /><SPAN>mogiet</SPAN></BODY></HTML> Fri, 07 Feb 2014 04:14:07 GMT https://community.esri.com/t5/water-resources-questions/cn-grid-creation/m-p/752237#M3848 WendellTalampas1 2014-02-07T04:14:07Z