Free Mp3 Ringtones
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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Autor</th> <th class="thCornerR">Wiadomość</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>txijle789</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/subSilver/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Wysłany: Pon 12:49, 09 Maj 2011<span class="gen"> </span> Temat postu: The Drain Game</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody"><span style="font-weight: bold">The Drain Game</span> <br />Drainage problems can best be avoided if grounds managers and greenkeepers understand their soil conditions,<a href="http://www.eshose.com/" target="_blank" class="postlink">Hydraulic Hose</a>, and know how to diagnose and treat any problems that occur through excess water.Too often, pipe drainage systems <a href="http://www.aimsizer.com/" target="_blank" class="postlink">Pore Size Analyzer</a> are installed automatically, without enough thought being given to both the soil physics of water movement and alternative methods.Soil is made of minerals originally derived from rock and organic matter taken from vegetation, water and air. Most soils in the UK have formed on top of glacial or alluvial secondary deposits, which is frequently boulder clay derived from glacial erosion and deposition. However, the original derivation of all this material is from rock. <br />This is a measure of the relative proportions of sand, silt and clay in a soil. Soils are often classified according to their texture, and the texture of a soil often provides a fair indication of how it will drain. The soil texture triangle <a href="http://www.aimsizer.com/" target="_blank" class="postlink">Pore Size Analyzer</a> is used to classify a soil based on the relative percentages of sand, silt and clay.FailedDrainage2Structure is a term that describes the way in which the individual soil particles join together to form larger aggregates. A well structured soil is usually characterised by an intensive system of small aggregates or crumbs, gradually leading into larger blocks further down the soil profile.Well structured soils are established on sites that have been left undisturbed for many years. The smaller particles in a soil form aggregates under the influence of clay, organic matter, earthworm activity and grass root activity. Poorly draining soils have often been badly over used and compacted.Water moves through soil in the spaces between the soil particles. These are called the pores. In a soil with a high clay and/or silt content, the pore spaces are very small; the pore spaces are usually much larger in a sand dominated soil. A well structured soil contains a system of inter-connected very large pores that enables efficient water movement.Downward water movement is faster in a soil where the pore spaces are large, hence sandy soils drain faster than clay/silt soils, and well structured soils drain faster than poorly structured soils. <br />Compaction reduces pore size and causes deterioration in structure.Breaking up compaction <a href="http://www.aimsizer.com/" target="_blank" class="postlink">Pore Size Analyzer</a> is one of the keys to keeping surfaces playable, as well as a good drainage system in place. Surfaces that have become compacted will not let water through. Compacted soils have had the pore spaces squeezed out of their structure and are a complete barrier to the downward movement of water.The key to good drainage is to know the sub-soil conditions to allow for the most appropriate drainage system to be applied.Drainage ScamperWhen all the pores of the soil are filled with water, the soil is considered to be saturated. The force of gravity pulls water downward through the soil and the rate at which the soil drains at this point is called the saturated hydraulic conductivity; this rate is proportional to the square of the pore diameter. Hence coarse textured soils will drain much faster than fine textured ones.As the soil drains, the largest pores are emptied and water remains in the smaller pores. A balance, or equilibrium is reached when the force of gravity can no longer move the water against the resisting forces of adhesion and cohesion. At this point the soil is at field capacity. <br />Topics related articles： <br /> <br /> <br /> <a href="http://www.holeinone.com.cn/bbs/uchome/space.php?uid=2530&do=blog&id=90837" target="_blank" class="postlink">Americans see English soccer as risk worth taking</a> <br /> <br /> <a href="http://www.0519ing.com/home/space.php?uid=4140&do=blog&id=382378" target="_blank" class="postlink">'Little Black Book' Director Nick Hurran</a> <br /> <br /> <a href="http://bridesface.com/blog.php?user=jiajia110321&blogentry_id=26816" target="_blank" class="postlink">That Bag Shop Attends 109th Canton Fair</a></span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="http://picsrv.fora.pl/subSilver/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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