Ask a Question forum: Dripline calculation

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Orange County, CA (Zone 10a)
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maxcaviar
May 28, 2015 9:16 AM CST
I've always thought that the dripline was measured from edge to edge (diameter) versus trunk to edge (radius). Is this not correct? Saw instructions the other day that calculated based on radius and thought I'd research it. There was a curious lack of explanation on almost everything I came across. Lots of diagrams showing the dripline to indicate its outer limits, but nothing to show how the actual linear distance of it was calculated.
Name: Jean
Prairieville, LA (Zone 9a)
Charter ATP Member Plant Identifier The WITWIT Badge Garden Sages Celebrating Gardening: 2015
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Moonhowl
May 28, 2015 10:09 AM CST
For most of the sites researched, the dripline is determined by the widest branch span. This first link gives the formula for critical root zone calculation, and includes a chart showing dripline info. I hope this helps.

http://www.extension.umn.edu/garden/yard-garden/trees-shrubs...

http://treesandshrubs.about.com/od/glossaryofcommonterms/g/d...

http://www.ehow.com/how_8116089_figure-drip-line-tree.html

http://en.wikipedia.org/wiki/Tree_crown_measurement

Orange County, CA (Zone 10a)
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maxcaviar
May 28, 2015 11:39 AM CST
thank you. funny how they won't just come out and say it's the radius. but i think i have it straight now ;)
Name: Jean
Prairieville, LA (Zone 9a)
Charter ATP Member Plant Identifier The WITWIT Badge Garden Sages Celebrating Gardening: 2015
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Moonhowl
May 28, 2015 3:42 PM CST
If it gets too easy everyone would do things themselves and the "in the know" folks would be out of a job.. Glad it helped.
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
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dyzzypyxxy
May 30, 2015 9:54 PM CST
At the risk of stating the obvious, most trees are decidedly asymmetrical, not perfect circles, and the drip line will be an irregular area at best. Plus the roots will extend sometimes several feet beyond the drip line so if you're calculating the area for a tree to be watered, take that into account! Also, quirky plants that they are, if they have a long branch extending out one way, chances are they have a long, strong root out in the opposite direction to keep from falling over.

Mother Nature's a pretty awesome engineer, but straight lines, right angles and perfect circles aren't on her list of specs.
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Orange County, CA (Zone 10a)
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maxcaviar
May 30, 2015 10:54 PM CST
so true, thanks!

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