To design a drainage system, which should be known is the amount of water that must be removed from the land in a certain period of time, this is done to avoid a rise in surface water.<\/span> Discard the excess water in the soil has two benefits: (1) prevent puddles on land (2) remove water from the root zone, so that the salts brought by irrigation can not reach concentrations that would be harmful to plants.<\/span><\/p>\n

To determine the magnitude of the rate of drainage of several factors to consider, among others, (1) The diverse natural conditions, and (2) the amount of water to be discharged.<\/span> Therefore, the field work to be done to figure out how soil conditions, water conditions, salinity and the amount of water that must be maintained.<\/span> To calculate the need for drainage, water balance analysis should be done on the whole area will be in the drainage as shown in Fig.<\/span>
\n<\/a>
\n Figure 30. The concept of the balance of water in soil<\/span><\/p>\n

Water balance is usually counted in the average term of one year.<\/span> Waterlogging and salinity problems should also be considered in-take into account the water balance.<\/span> Especially for certain years, for example, a very dry year or a year with extreme rainfall, or even for a certain period, for example the growing season or rainy season.<\/span><\/p>\n

Surface Groundwater<\/strong><\/span>
\n<\/strong> Ground water table is the upper limit of the groundwater.<\/span> It is defined as the point where the water pressure in the ground is equal to atmospheric pressure.<\/span> Beneath the surface of groundwater, all soil pores filled with water, al is known as saturated zone as shown in Figure 8:13.<\/span>
\n<\/a>
\n Figure 31. Surface soil water<\/span><\/p>\n

Generally, groundwater flow toward the drain occurs in the saturated zone.<\/span> On the surface of the water, there are zones where soil pores filled partially with water and most of the air, and the zone is the unsaturated zone.<\/span> Water in the unsaturated zone from rain or irrigation water that has entered into the ground, and that comes from the capillary rise of groundwater.<\/span> Unsaturated zone is essential for plant growth.<\/span> In this zone the roots of the plants take water from the soil.<\/span><\/p>\n

High water level is always changing with time, after irrigation or rainfall occurs will increase the water surface and is followed by a gradual decline due to the flow of water into the drainage system.<\/span>
\n Water levels be measured to determine the highest water levels (maximum), average and minimum or lowest annually.<\/span> Ground water levels are constantly changing due to the replenishment of groundwater by rain or irrigation.<\/span><\/p>\n

For this reason, the measurement of ground water level should be performed at frequent intervals, at least for a period of one year.<\/span> The interval between readings should not exceed one month, but two weeks is probably better.<\/span> All measurements of ground water level in the drainage area that will be done as early as possible, and conducted over a span as short as possible so that a complete picture of the surface of the water in that time frame can be obtained.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

To design a drainage system, which should be known is the amount of water that must be removed from the land in a certain period of time, this is done to avoid a rise in surface water. Discard the excess water in the soil has two benefits: (1) prevent puddles on land (2) remove water …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1865],"tags":[2056,2065,2062,2064,2058,2057,2061,2060,2063,2059],"class_list":["post-1444","post","type-post","status-publish","format-standard","hentry","category-english","tag-drainage-requirements","tag-drainage-requirements-for-balconies","tag-drainage-requirements-for-car-wash","tag-drainage-requirements-for-driveways","tag-drainage-requirements-for-planning-applications","tag-drainage-requirements-for-retaining-walls","tag-drainage-requirements-for-road-design","tag-drainage-requirements-in-pavements","tag-drainage-requirements-of-crops","tag-drainage-requirements-washing-machine"],"_links":{"self":[{"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/posts\/1444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/comments?post=1444"}],"version-history":[{"count":1,"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/posts\/1444\/revisions"}],"predecessor-version":[{"id":3480,"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/posts\/1444\/revisions\/3480"}],"wp:attachment":[{"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/media?parent=1444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/categories?post=1444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tneutron.net\/sipil\/wp-json\/wp\/v2\/tags?post=1444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}