The natural slope is very helpful and it doesn’t have to slope a lot. And even if you don’t have that there are some landscaping and grading tricks you can use to acquire the slope you need for a wonderful and natural looking creek. (That is, if you think having a creek in the back yard of someone who lives in an urban subdivision natural). But you know what I mean. The trick is to use the natural slope of the ground, NOT to build a mountain or even a mole hill in the flat of your yard. That is anything but natural looking.
