What's the permeability of the "land" (I don't know how to say it)?

Answer 1

Water penetration:
Soil type or texture is a major determining factor of how much water a soil will hold, or how quickly a soil can be irrigated. For example, 1 inch of water applied to a sandy soil will penetrate 12 inches. It will move anywhere from 6-10 inches into a good loam soil, and in a clay soil it will percolate down only 4-5 inches.

Time required:
Sandy soils allow water to penetrate more quickly than will heavy, dense soils. Wetting the entire root zone of plants growing in heavy soils takes much longer than wetting plants growing in lighter soils. Sandy loams will accept from 1/2-3 inches of water per hour. A clay-loam may absorb only 1/10 - 3/5 inches of water in the same amount of time. A very dry clay-loam soil could therefore take as long as 120 hours to completely wet to a depth of 12 inches. A sandy loam, however, might take as little as four hours.




Soil varies in its density depending on several factors. Particle size comes from the mineral constituents, organic material, and compaction. Sand is the largest particle, silt, then clay is the smallest. Sand is most often granite or quartz while clay can come from feldspar so can form densely, stacked plates. Optimum blends of soil minerals are: Sand 30-50%, Silt 30-50%, Clay 20-30%, Organic material 7-10%. So good soil generally consists of 90-93% total mineral and 7-10% bio-organic substances.
The last two components, air and water, must be able to move freely though the soil. Once soil is compacted air and water are excluded destroying the healthy structure. Minerals represent only around 45% of the total soil volume, water and air each occupy nearly 25%, and organic matter from 2% to 5%.

Answer 2

Do you mean the permeability of soil? Some soil types allow water to flow through them easily, like sand and gravel. Other soil types do not let water flow through them, like clay.

Solid rock, of any type, is usually considered impermeable.

Answer 3

its the amount of water that can get through the land

ie soil has good perability those water gets through well plants can grow in it

clay as low Perm. and water doesnt seep through it well.

Answer 4

ok