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I am currently using the demo version of Retain pro 10 to try evaluate the program before purchasing. I decided to test a 15 ft. high Gabion retaining wall we are designing for a residential property. I would like to find out if it is possible to change the offset reference at the base of the...

I agree. So basically the storage required would equal the total runoff volume from the subcathment (s)?

Thank you Peter. There is no percolation test for this site yet, although the test borings show a consistent SW soil throughout and the water table is around 48ft below grade. Nevertheless, I think perhaps I should uncheck the box "allow exfiltration" . I am mainly concerned about obtaining a...

Hi Peter, What would be a reasonable exfiltration rate on drywells (setting at constant velocity)for gravelly sands (SW) in HSG A? The value I had on an example file was 4 inches/ hour. Thank you.

Thank you beej67. I have set the Tc at 5 minutes for the pre and post analysis. I am getting a warning message Hint#37 (longer time span advised for full volumes). Right now I have a 24 hr. time span starting at 0 ending at 24, with a time increment of 0.03. I also set the storm type to Win...

Peter, Precisely what I did. However I had to change the flow length for the post development from 150 ft to 100 ft, as required by the local governing agency. Also, the plan reviewer had a comment on the Tc. He thought 7.5 minutes was too high. He also insists that the analysis has to be done...

Thank you very much Peter and psmart! I am glad my instincts were correct.I believe I can separate the files myself or redo them separately. Thanks again.

I am new to hydrocad and have some basic questions I need help with. Any comments are most welcome. I have a 7.8 acres site that I am analyzing for pre and post watershed conditions for a SWPPP report. Basically, the existing site is being modified to include an additional 4.3 acres of...