New answers tagged drainage
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Buy a laser, using ground level of your home mark the point in your garden where slop should be highest, second mark the point where slop should be lowest, if for example the difference should be of 6 inch then highest point should be 6 inch high and lowest point should be 6 inch lower than highest point. Once point are marked put some pegs in the ground and ...
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In general adding ingredients to any mix will decrease its drainage.
Consider a jar of marbles. It has about 30% air volume, and the spaces between are large so offer little resistance to flow.
Consider a jar of BB's. Also spherical components so also about 30% air volume. The passages are smaller so their is some increase in flow resistance.
Now mix them....
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