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Because determining steady state infiltrability can be time-consuming while saturated hydraulic conductivity is easier to measure, the study evaluates a modified Philip’s equation by substituting saturated hydraulic conductivity for steady state infiltrability. Field tests in two soil types under three land use systems employed a single ring infiltrometer.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & 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is predicting infiltration from soil hydraulic properties important?","Question",{"text":63,"@type":64},"Infiltration controls key hydrological processes such as irrigation planning, crop water requirement estimation, groundwater recharge monitoring, and runoff/erosion prediction.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What challenge motivates using saturated hydraulic conductivity instead of steady state infiltrability?",{"text":68,"@type":64},"Steady state infiltrability determination can be tedious and time-consuming, while saturated hydraulic conductivity is easier to measure in the laboratory.",{"name":70,"@type":61,"acceptedAnswer":71},"How does the study assess the modified Philip’s equation?",{"text":72,"@type":64},"Measured and predicted cumulative infiltration amounts are compared using goodness-of-fit for both steady state infiltrability-based and saturated hydraulic conductivity-based forms of Philip’s equation.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},157101,1787973879,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,111,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & 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properties Henry Oppong Tuffour *, Joseph Asare, Gilbert Mcphelan Nutakor  \nDepartment of Crop and Soil Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana  \nArticle Info  \nReceived : 13.06.2017  \nAccepted : 25.08.2017  \nAbstract  \nField and laboratory infiltration measurements using infiltrometers have been the only methods of effectively determining the infiltration rates of soils. Infiltration is mainly controlled by soil hydraulic properties, especially the hydraulic conductivity. Due to the ease with which the saturated hydraulic conductivity can be determined, it is often preferred to the unsaturated hydraulic conductivity in hydrological studies. It is well known that, at saturation the steady state infiltrability controls the infiltration process. Thus, it is very clear that the saturated hydraulic conductivity 􀜭􀯦 and steady state infiltrability 􀜭􀯢 may be closely related in one way or the other, as suggested in some few studies, wherein functions have been developed to relate these two parameters. However, these functions are often site specific and do not always carry out accurately all the time. Determination of 􀜭􀯢 can be tedious and time consuming, whereas 􀜭􀯦 can be easily determined in the laboratory. The present study aimed to assess the predictability of a modified Philip’s equation by substituting 􀜭􀯦 for 􀜭􀯢 . In this study, field infiltration measurements were conducted in two soil types under three different land use systems with a single ring infiltrometer. Field and laboratory hydraulic and hydrologic experiments were conducted on soils in a turf grass, an arable land and a pastureland in the Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. Goodness-offit was used to compare the measured and predicted cumulative infiltration amounts from both 􀜭􀯢 and 􀜭􀯦 . The results showed that there was a robust relationship between the measured and predicted cumulative infiltration amount values from the Philip’s and modified Philip’s equations, respectively for all three fields. However, the use of 􀜭􀯦 in place of 􀜭􀯢 produced the best outcome in all the study areas. Thus, substituting 􀜭􀯦 for 􀜭􀯢 in the Philip’s infiltration equation can better predict cumulative infiltration amount. The proposed modified Philip’s infiltration equation and the key parameters (i.e., 􀜵􀰏 and 􀜭􀯦) provide new understanding into the realistic flow processes in soil. Furthermore, the 􀜭􀯦 in the new equation is very close to the measured 􀜭􀯢 .  \nKeywords: Cumulative infiltration amount, manometer, saturated hydraulic conductivity, sorptivity, steady state infiltrability.  \n© 2018 Federation of Eurasian Soil Science Societies. All rights reserved  \nIntroduction  \n‘‘The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them’’ – Sir Lawrence Bragg, the Nobel laureate in physics (Breverton, 2009; Su, 2010). Infiltration studies are necessary in hydrological advancements, such as irrigation design and planning, estimation of water requirements for crops, monitoring of groundwater recharge and prediction of runoff and erosion (Tuffour and Bonsu, 2015) . Infiltration measurements in the field are often coupled with complicated apparatus for the hydrological characterization of soils, and also require larger computation times, especially, when steady state flow is required. Since field infiltration measurements are conducted on spot-to-spot basis on a field scale, a large number of determinations is required to assess the magnitude and structure of the variation  \n* Corresponding author.  \nDepartment of Crop and Soil Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana  \nTel.: +233 208542308 [E-mail address:](E-mail address: hoppongtuffour@gmail.com)[ hoppongtuffour@gmail.com](E-mail address: hoppongtuffour@gmail.com)  \n[e-ISSN: 2147-4249 DOI:](e-ISSN: 2147","cbCaimvUUlKaYVU2","https://ap.wps.com/l/cbCaimvUUlKaYVU2","pdf",864681,"English","# Abstract\n# Introduction","[{\"question\":\"Why is predicting infiltration from soil hydraulic properties important?\",\"answer\":\"Infiltration controls key hydrological processes such as irrigation planning, crop water requirement estimation, groundwater recharge monitoring, and runoff/erosion prediction.\"},{\"question\":\"What challenge motivates using saturated hydraulic conductivity instead of steady state infiltrability?\",\"answer\":\"Steady state infiltrability determination can be tedious and time-consuming, while saturated hydraulic conductivity is easier to measure in the laboratory.\"},{\"question\":\"How does the study assess the modified Philip’s equation?\",\"answer\":\"Measured and predicted cumulative infiltration amounts are compared using goodness-of-fit for both steady state infiltrability-based and saturated hydraulic conductivity-based forms of Philip’s equation.\"}]","Prediction of infiltration from soil hydraulic properties - modified Philip’s equation for cumulative infiltration | PDF",23]