John Daley Bendigo, Australia The Enemy of progress is the hope of a perfect plan
Benefits of rainfall collection https://permies.com/t/88043/benefits-rainfall-collection
GOOD DEBT/ BAD DEBT https://permies.com/t/179218/mortgages-good-debt-bad-debt
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Douglas Alpenstock wrote:......Obviously somebody has a lot more surplus water than I do.
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John Daley Bendigo, Australia The Enemy of progress is the hope of a perfect plan
Benefits of rainfall collection https://permies.com/t/88043/benefits-rainfall-collection
GOOD DEBT/ BAD DEBT https://permies.com/t/179218/mortgages-good-debt-bad-debt
John C Daley wrote:I am glad you are watching and then commenting.
Its a very detailed explanation of the whys and wherefores.
Basically about 27 acres of this farm was soaked with water in may and the growing season extends to thru to september .
By draining the water the grass growth improves by as much as 50% which in his case means he hopes to gain 4000 lbs of extra weight from cattle in the paddock.
Such draining only works on ground that is poorly drained so large areas of the countryside will not be flooding pastures down stream.
The system install here is 6 miles long for the 27 acres.
I think it's impossible to make french drains etc on this sized project.
The use of tile drains has been working for about 150 years and the issues of blocking, fertilizer loss dont seem to be a problem.
I think membrane socks are not used because they are not needed in this case but is used where the soils are fine sane etc.
Basically it is used because it works and pays for it self.
Johns link to the paper from Canada mentions this;
The greatest benefits of tile drainage typically are realized in wet years, but because drainage promotes deep root development,
crops often will have better access to soil moisture in dry years. During extremely dry growing seasons, a
tile-drained field certainly might have less available water at some point during the growing season
than an undrained field.
Whether such an effect would offset the early season positive effects of drainage is unknown, and highly
site- and year-specific. In general, where poorly drained soils exist, crop yields will be more uniform from year to year with tile drainage
FLOODING DOWNSTREAM
Tile drainage impacts on downstream flow and flooding have been the subject of much debate for
more than a century. The influence of tile drainage on stream flow involves complex processes that
depend on many factors. Therefore, generalizations Tile drainage impacts on downstream fl ow and
fl ooding have been the subject of much debate for more than a century.
Some of the important factors that will determine the impact of tile drainage on downstream fl ow and
fl ooding include soil types, rainfall (or snowmelt) amount and intensity, point of interest (near the fi eld
outlet or over a larger watershed), time frame of interest, existing soil moisture conditions, and the
extent of surface drainage (including surface intakes) and channel improvements. “
The golden rule of drainage water management is to drain only that amount necessary to create adequate fi eld conditions
and retain water that may contribute to crop production
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