thd7t wrote:Thank you! I have seen you post this diagram before, but was having trouble finding it. It looks like you are following low points (swales) and the percent grade is determined by the path of the water. Am I understanding this correctly?
KOOTA wrote:in order to avoid this you just make the distance between the 107' elevation swales larger? is there a max separation to stay with in, (talking about107 elevation line that goes around the building)
redbird11 wrote:Hmmm...are you not changing your rise more than 1 foot?
1'-0"/.02= 50'-0". Something doesn't add up about this statement.
Sparky83 wrote:This is an example of the most common error in site grading.
DO NOT use sketch circles to check the MINIMUM slope. You must measure the path that water will take downhill. Use sketch lines...shown in red. Sketch circles can only be used to measure a distance that is a straight line...basic geometry.
The green dimensions total 56'-0" even though the tips of the topo lines are within 50' of each other. Same for the blue dimensions at 65'-0" apart.
This file has better resolution. Thanks to mandyk650:
Sparky83 wrote:thd7t wrote:Thank you! I have seen you post this diagram before, but was having trouble finding it. It looks like you are following low points (swales) and the percent grade is determined by the path of the water. Am I understanding this correctly?
The distance the water will travel....along the centerline of the swale (red lines) cannot exceed 50' if you have a min slope required of 2%.
Raja wrote:Sparky83 wrote:thd7t wrote:Thank you! I have seen you post this diagram before, but was having trouble finding it. It looks like you are following low points (swales) and the percent grade is determined by the path of the water. Am I understanding this correctly?
The distance the water will travel....along the centerline of the swale (red lines) cannot exceed 50' if you have a min slope required of 2%.
Hey Sparky83, thanks for all your comments on this topic. I think I get the gist of some of the other issues raised on this vignette but I don't understand how you know that there's a max swale length...
But more importantly, what is the math to determine maximum swale length? Also would there be a minimum swale length and formula for that too?
Sparky83 wrote:Raja wrote:Sparky83 wrote:thd7t wrote:Thank you! I have seen you post this diagram before, but was having trouble finding it. It looks like you are following low points (swales) and the percent grade is determined by the path of the water. Am I understanding this correctly?
The distance the water will travel....along the centerline of the swale (red lines) cannot exceed 50' if you have a min slope required of 2%.
Hey Sparky83, thanks for all your comments on this topic. I think I get the gist of some of the other issues raised on this vignette but I don't understand how you know that there's a max swale length...
But more importantly, what is the math to determine maximum swale length? Also would there be a minimum swale length and formula for that too?
There is no such thing as swale length. Min and max slopes regulate the distance between contour lines. For min slope, there is a max distance between the "points" of contour lines in a swale.
jirafa1000 wrote:What MIN SLOPE should be considered if non is given?
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