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Default Values in HydroCad

thread789-158519

Default Values in HydroCad

Default Values in HydroCad

(OP)
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 ?

RE: Default Values in HydroCad

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?

RE: Default Values in HydroCad

(OP)
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.

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