Surface runoff

fonseh

Homework Statement

In my book , i was told that when the drainage of surface is high then the surface runoff will be low . However , i don't think it's correct .

The Attempt at a Solution

Definiton : Runoff can be described as the part of the water cycle that flows over land as surface water instead of being absorbed into groundwater or evaporating.
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I think that when the surface drainage is high , more water will be drained from the particular surface to another . This results in more water absorbed , resulting in higher surface runoff , correct me if i am wrong .

You have not given much context here. Are you modelling rain water flow over soil?
The exact wording is very important.

If the drainage into a surface is high, then there will be less to run off that surface onto another.

Merlin3189 and fonseh
fonseh
You have not given much context here. Are you modelling rain water flow over soil?
The exact wording is very important.

If the drainage into a surface is high, then there will be less to run off that surface onto another.
why ?
here it is

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Gold Member
Assuming natural ground with no pumping systems then any water flowing into a particular region can only do one of four things - accumulate , evaporate , soak in or run off to somewhere else .

CWatters and Merlin3189
The term Drainage is being used in two different ways.
"Surface drainage density" is a different concept to "surface drainage". They are in effect perpendicular.

Well-drained or poorly-drained is being used to describe the ability of a surface to absorb water vertically into a porous surface.

"Drainage density" is defined as the length of horizontal surface channel per unit area that carry runoff.

A well-drained surface is porous. Because it absorbs water, there is less water available to runoff and so there are less surface channels needed, which implies a lower surface drainage density is needed.

Last edited:
CWatters, fonseh and BvU