Need to find the end of an underground drainage pipe
 

I have a 4 inch corrugated plastic drainage pipe that is where the downspouts drain. Does anyone know of a toll or service that can find the end of such ? I don't know if it goes to daylight or stops in a dry well or ???
I though to tie a tennis ball to the end of a string and trying to flush it as far possible and then measure the string length.
Don't know if I would have enough water to keep it in motion (I could wait for a real downpour and use the rains to help)

Most drain cleaning companies have cameras that will do that. My plumber has one. If you cant find the end then it probably goes into a drywell.

Is your plumber close to the Meredith area ?