https://forums.autodesk.com/t5/civil-3d-forum/changing-curve-number-in-hydrographs-has-no-effect-of-peak-flow/m-p/13357190#M2929 <P>Ran hydrographs with a curve number of 70.&nbsp; Then changed it to 98.&nbsp; No effect of peak flow or volume.&nbsp; &nbsp;Changed to 40.&nbsp; No effect.&nbsp; &nbsp; As the curve number increases, both peak flow and runoff volume should increase.&nbsp;&nbsp;Could anyone tell me what I might be doing wrong.?</P> Thu, 06 Mar 2025 19:22:18 GMT kirk_barrettAHPWN 2025-03-06T19:22:18Z https://forums.autodesk.com/t5/civil-3d-forum/changing-curve-number-in-hydrographs-has-no-effect-of-peak-flow/m-p/13357190#M2929 <P>Ran hydrographs with a curve number of 70.&nbsp; Then changed it to 98.&nbsp; No effect of peak flow or volume.&nbsp; &nbsp;Changed to 40.&nbsp; No effect.&nbsp; &nbsp; As the curve number increases, both peak flow and runoff volume should increase.&nbsp;&nbsp;Could anyone tell me what I might be doing wrong.?</P> Thu, 06 Mar 2025 19:22:18 GMT https://forums.autodesk.com/t5/civil-3d-forum/changing-curve-number-in-hydrographs-has-no-effect-of-peak-flow/m-p/13357190#M2929 kirk_barrettAHPWN 2025-03-06T19:22:18Z https://forums.autodesk.com/t5/civil-3d-forum/changing-curve-number-in-hydrographs-has-no-effect-of-peak-flow/m-p/13400305#M2930 <P>I found out this is a bug in hydrographs.&nbsp; It happens when you have a custom storm and change the duration.&nbsp; Somehow Hydrographs gets confused and generates runoff as if everything is impervious.&nbsp; This is one of several bugs I have found in this program.&nbsp; &nbsp;Another one is&nbsp;<SPAN>the elevation in a reservoir is not correctly graphed when the water level is below the lowest outlet.</SPAN> Any else noticed these bugs?</P> Mon, 31 Mar 2025 18:39:56 GMT https://forums.autodesk.com/t5/civil-3d-forum/changing-curve-number-in-hydrographs-has-no-effect-of-peak-flow/m-p/13400305#M2930 kirk_barrettAHPWN 2025-03-31T18:39:56Z