What is the drainage ratio?

Question

What is the drainage ratio?

Answer 1

If you mean drainage density, then that is the relative density of natural drainage channels in a given area. It is usually expressed in terms of miles of natural drainage or stream channel per square mile of area, and obtained by dividing the total length of stream channels in the area in miles by the area in square miles.

Answer 2

well depends if you hold the lever down you should get a complete flush, but if you just tap it, it prolly won't drain all the way.