Default Values in HydroCad 1

[RWF7437]

Why does HydroCad default to a CN of 75 for impervious areas ? Why or how can I changes the default ot CN=99 or CN=100 ?

 

[psmart]

There are no default CN values. You can set any CN value you wish. You can use the built-in CN lookup table, or enter the value directly. Impervious surfaces are generally represented with a CN value of 98, as listed in the table, but this is entirely up to you.

Where are you seeing a "default" value of 75?

 

[psmart]

Also please see

http://www.hydrocad.net/impervious.htm

 

[RWF7437]

Thank you for your answers. I tried to recreate the problem but couldn't so it is probable it was just a mistake on my part. I'll check the link.