{"id":4287,"date":"2020-10-02T12:56:01","date_gmt":"2020-10-02T11:56:01","guid":{"rendered":"https:\/\/www.nickzom.org\/blog\/?p=4287"},"modified":"2024-04-21T14:57:45","modified_gmt":"2024-04-21T13:57:45","slug":"how-to-calculate-and-solve-for-evaporation-from-open-water-surface-irrigation-water-requirement","status":"publish","type":"post","link":"https:\/\/www.nickzom.org\/blog\/2020\/10\/02\/how-to-calculate-and-solve-for-evaporation-from-open-water-surface-irrigation-water-requirement\/","title":{"rendered":"How to Calculate and Solve for Evaporation from Open Water Surface | Irrigation Water Requirement"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-4301\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/evaporation-from-open-water-surface-300x112.png\" alt=\"\" width=\"300\" height=\"112\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/evaporation-from-open-water-surface-300x112.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/evaporation-from-open-water-surface.png 355w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>The image above represents evaporation from the open water surface. To calculate evaporation from the open water surface, four essential parameters are needed, and these parameters are the Slope of Saturation Vapour Pressure vs. Temperature Curve (\u0394), Net Radiation (Qn), Aerodynamic Component (Ea), and Psychometric Constant (Y).<\/p>\n<h3><strong>The formula for calculating evaporation from open water surface:<\/strong><\/h3>\n<p>E<sub>o<\/sub>\u00a0=\u00a0<sup>\u0394Q<sub>n<\/sub>\u00a0+ YE<sub>a<\/sub><\/sup>\u00a0\/\u00a0<sub>\u0394 + Y<\/sub><\/p>\n<p>Where:<\/p>\n<p>E<sub>o<\/sub>\u00a0= Evapouration from Open Water Surface<br \/>\n\u0394 = Slope of Saturation Vapour Pressure vs Temperature Curve<br \/>\nQ<sub>n<\/sub>\u00a0= Net Radiation<br \/>\nE<sub>a<\/sub>\u00a0= Aerodynamic Component<br \/>\nY = Psychometric Constant<\/p>\n<p>Let&#8217;s solve an example;<br \/>\nFind the evaporation from open water surface when the slope of saturation vapour pressure vs temperature curve is 20, the net radiation is 16, the aerodynamic component is 12 and psychometric constant is 10.<\/p>\n<p>This implies that;<\/p>\n<p>\u0394 = Slope of Saturation Vapour Pressure vs Temperature Curve = 20<br \/>\nQ<sub>n<\/sub> = Net Radiation = 16<br \/>\nE<sub>a<\/sub> = Aerodynamic Component = 12<br \/>\nY = Psychometric Constant = 10<\/p>\n<p>E<sub>o<\/sub>\u00a0=\u00a0<sup>\u0394Q<sub>n<\/sub>\u00a0+ YE<sub>a<\/sub><\/sup>\u00a0\/\u00a0<sub>\u0394 + Y<\/sub><br \/>\nE<sub>o<\/sub>\u00a0=\u00a0<sup>(20)(16) + (10)(12)<\/sup>\u00a0\/\u00a0<sub>20 + 10<\/sub><br \/>\nThat is, E<sub>o<\/sub>\u00a0=\u00a0<sup>320 + 120<\/sup>\u00a0\/\u00a0<sub>30<\/sub><br \/>\nE<sub>o<\/sub>\u00a0=\u00a0<sup>440<\/sup>\u00a0\/\u00a0<sub>30<\/sub><br \/>\nE<sub>o<\/sub> = 14.6<\/p>\n<p>Therefore, the\u00a0<strong>evaporation from open water surface\u00a0<\/strong>is\u00a0<strong>14.6.<\/strong><\/p>\n<p>Read more:\u00a0<a href=\"https:\/\/www.nickzom.org\/blog\/2020\/10\/02\/how-to-calculate-and-solve-for-storage-difference-irrigation-water-requirement\/\">How to Calculate and Solve for Storage Difference | Irrigation Water Requirement<\/a><\/p>\n<h3><strong>How to Calculate Evaporation from Open Water Surface Using Nickzom Calculator<\/strong><\/h3>\n<p>Nickzom Calculator \u2013\u00a0<strong>The Calculator Encyclopedia<\/strong> is capable of calculating the evaporation from open water surface.<\/p>\n<p>To get the answer and workings of the evaporation from open water surface using the <strong>Nickzom Calculator \u2013 The Calculator Encyclopedia.\u00a0<\/strong>First, you need to obtain the app.<\/p>\n<p>You can get this app via any of these means:<\/p>\n<p><strong>Web<\/strong>\u00a0\u2013\u00a0<a href=\"https:\/\/www.nickzom.org\/calculator-plus\">https:\/\/www.nickzom.org\/calculator-plus<\/a><\/p>\n<p>To get access to the\u00a0<strong>professional\u00a0<\/strong>version via web, you need to\u00a0<strong>register<\/strong>\u00a0and\u00a0<strong>subscribe\u00a0<\/strong>for<strong>\u00a0NGN 2,000\u00a0<\/strong>per<strong>\u00a0annum<\/strong>\u00a0to have utter access to all functionalities.<br \/>\nYou can also try the\u00a0<strong>demo\u00a0<\/strong>version via\u00a0<a href=\"https:\/\/www.nickzom.org\/calculator\">https:\/\/www.nickzom.org\/calculator<\/a><\/p>\n<p><strong>Android (Paid)<\/strong>\u00a0\u2013\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=org.nickzom.nickzomcalculator\">https:\/\/play.google.com\/store\/apps\/details?id=org.nickzom.nickzomcalculator<\/a><br \/>\n<strong>Android (Free)<\/strong>\u00a0\u2013\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.nickzom.nickzomcalculator\">https:\/\/play.google.com\/store\/apps\/details?id=com.nickzom.nickzomcalculator<\/a><br \/>\n<strong>Apple (Paid)<\/strong>\u00a0\u2013\u00a0<a href=\"https:\/\/itunes.apple.com\/us\/app\/nickzom-calculator\/id1331162702?mt=8\">https:\/\/itunes.apple.com\/us\/app\/nickzom-calculator\/id1331162702?mt=8<\/a><br \/>\nOnce, you have obtained the calculator encyclopedia app, proceed to the\u00a0<strong>Calculator Map,\u00a0<\/strong>then click on\u00a0<strong>Agricultural<\/strong><b>\u00a0<\/b>under\u00a0<strong>Engineering<\/strong><strong>.<\/strong><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-3799 size-full\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-1478.png\" alt=\"\" width=\"1366\" height=\"768\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-1478.png 1366w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-1478-300x169.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-1478-1024x576.png 1024w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-1478-768x432.png 768w\" sizes=\"(max-width: 1366px) 100vw, 1366px\" \/><\/p>\n<p>Now, Click on\u00a0<strong>Irrigation Water Requirement\u00a0<\/strong>under\u00a0<strong>Agricultural<\/strong><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-4177 size-full\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1683.png\" alt=\"\" width=\"1366\" height=\"768\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1683.png 1366w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1683-300x169.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1683-1024x576.png 1024w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1683-768x432.png 768w\" sizes=\"(max-width: 1366px) 100vw, 1366px\" \/><\/p>\n<p>Now, Click on <strong>Evaporation from Open Water Surface<\/strong><strong>\u00a0<\/strong>under\u00a0<strong>Irrigation Water Requirement<\/strong><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-4300 size-full\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1748.png\" alt=\"How to Calculate and Solve for Evaporation from Open Water Surface | Irrigation Water Requirement\" width=\"1366\" height=\"768\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1748.png 1366w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1748-300x169.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1748-1024x576.png 1024w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1748-768x432.png 768w\" sizes=\"(max-width: 1366px) 100vw, 1366px\" \/><\/p>\n<p>The screenshot below displays the page or activity to enter your values, to get the answer for the evaporation from open water surface according to the respective parameters which is the <strong>Slope of Saturation Vapour Pressure vs Temperature Curve (\u0394), Net Radiation (Q<sub>n<\/sub>), Aerodynamic Component (E<sub>a<\/sub>)\u00a0<\/strong>and<strong> Psychometric Constant (Y).<\/strong><\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-4299 size-full\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1749.png\" alt=\"\" width=\"1366\" height=\"768\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1749.png 1366w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1749-300x169.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1749-1024x576.png 1024w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1749-768x432.png 768w\" sizes=\"(max-width: 1366px) 100vw, 1366px\" \/><\/p>\n<p>Now, enter the values appropriately and accordingly for the parameters as required by the <strong>Slope of Saturation Vapour Pressure vs Temperature Curve (\u0394)<\/strong> is <strong>20<\/strong>,<strong> Net Radiation (Q<sub>n<\/sub>)<\/strong> is <strong>16<\/strong>,<strong> Aerodynamic Component (E<sub>a<\/sub>)\u00a0<\/strong>is <strong>12 <\/strong>and<strong> Psychometric Constant (Y)<\/strong> is <strong>10<\/strong>.<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-4298 size-full\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1750.png\" alt=\"How to Calculate and Solve for Evaporation from Open Water Surface | Irrigation Water Requirement\" width=\"1366\" height=\"768\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1750.png 1366w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1750-300x169.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1750-1024x576.png 1024w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1750-768x432.png 768w\" sizes=\"(max-width: 1366px) 100vw, 1366px\" \/><\/p>\n<p>Finally, Click on Calculate<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-4297 size-full\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1751.png\" alt=\"How to Calculate and Solve for Evaporation from Open Water Surface | Irrigation Water Requirement\" width=\"1366\" height=\"768\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1751.png 1366w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1751-300x169.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1751-1024x576.png 1024w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1751-768x432.png 768w\" sizes=\"(max-width: 1366px) 100vw, 1366px\" \/><br \/>\n<img decoding=\"async\" class=\"alignnone wp-image-4296 size-full\" src=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1752.png\" alt=\"\" width=\"1366\" height=\"768\" srcset=\"https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1752.png 1366w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1752-300x169.png 300w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1752-1024x576.png 1024w, https:\/\/www.nickzom.org\/blog\/wp-content\/uploads\/2020\/10\/Screenshot-1752-768x432.png 768w\" sizes=\"(max-width: 1366px) 100vw, 1366px\" \/><\/p>\n<p>As you can see from the screenshot above, Nickzom Calculator\u2013 The Calculator Encyclopedia solves for the evaporation from the open water surfaces and presents the formula, workings, and steps too.<\/p>\n","protected":false},"excerpt":{"rendered":"The image above represents evaporation from the open water surface. To calculate evaporation from the open water surface,&hellip;","protected":false},"author":5,"featured_media":14161,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_lmt_disableupdate":"","_lmt_disable":"","_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","_yoast_wpseo_focuskw_text_input":"","csco_display_header_overlay":false,"csco_singular_sidebar":"","csco_page_header_type":"","footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[47],"tags":[1253,828,60,1254,1207,1171,1177,1252],"class_list":["post-4287","post","type-post","status-publish","format-standard","has-post-thumbnail","category-engineering","tag-aerodynamic-component","tag-agricultural","tag-engineering","tag-evaporation-from-open-water-surface","tag-irrigation-water-requirement","tag-net-radiation","tag-psychometric-constant","tag-slope-of-saturation-vapour-pressure-vs-temperature-curve","cs-entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Calculate and Solve for Evaporation from Open Water Surface | Irrigation Water Requirement<\/title>\n<meta name=\"description\" content=\"Learn the steps and the formula on How to Calculate and Solve for Evaporation from Open Water Surface in Irrigation Water Requirement.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nickzom.org\/blog\/2020\/10\/02\/how-to-calculate-and-solve-for-evaporation-from-open-water-surface-irrigation-water-requirement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Calculate and Solve for Evaporation from Open Water Surface | Irrigation Water Requirement\" \/>\n<meta property=\"og:description\" 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