{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19856"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19856","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effect of tillage on rainfall infiltration and surface depressional storage","abstract":"Research to evaluate the effects of tillage on rainfall infiltration and surface depressional storage was conducted. A method that generates infiltration, surface depressional storage, detention storage and hydraulic conductivity from data obtained from small field plots receiving simulated rainfall was developed. Values of Manning's resistance coefficient and overland flow velocity were calculated using the detention storage depth. Comparisons between observed and calculated overland flow velocities were made.","abstract_html":"Research to evaluate the effects of tillage on rainfall infiltration and surface depressional storage was conducted. A method that generates infiltration, surface depressional storage, detention storage and hydraulic conductivity from data obtained from small field plots receiving simulated rainfall was developed. Values of Manning's resistance coefficient and overland flow velocity were calculated using the detention storage depth. Comparisons between observed and calculated overland flow velocities were made.","abstract_has_math":false,"creators":["Mohamoud, Yusuf Mohamed"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Agricultural Engineering","degree_department":null,"school":null,"contributors":["Ewing, Loyd K."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:20:52Z","date_published":"2011-05-07T12:20:52Z","updated_at":"2026-07-22T22:25:14Z","subjects":["Engineering, Agricultural"],"languages":["eng"],"rights":["Copyright 1989 Mohamoud, Yusuf Mohamed"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI8924901","(UMI)AAI8924901"],"render_values":[{"text":"AAI8924901","href":null,"code":true},{"text":"(UMI)AAI8924901","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19856","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ewing, Loyd K."]},{"key":"dc:creator","label":"Author","values":["Mohamoud, Yusuf Mohamed"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:20:52Z","10000-01-01","1989"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Agricultural Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Agricultural"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1989 Mohamoud, Yusuf Mohamed"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI8924901","(UMI)AAI8924901","http://hdl.handle.net/2142/19856"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Research to evaluate the effects of tillage on rainfall infiltration and surface depressional storage was conducted. A method that generates infiltration, surface depressional storage, detention storage and hydraulic conductivity from data obtained from small field plots receiving simulated rainfall was developed. Values of Manning's resistance coefficient and overland flow velocity were calculated using the detention storage depth. Comparisons between observed and calculated overland flow velocities were made.","A laboratory experiment was conducted to quantify the amount of rainfall intercepted by residue at different rainfall intensities and durations. A maximum of 1.5 mm and 1 mm was intercepted by corn and soybeans, respectively. Laboratory experiments to determine tillage-induced soil hydraulic properties were conducted. Soil hydraulic properties were determined for three common surface conditions of a Catlin tilled soil; freshly tilled, protected (no-till), and crusted condition. These soil hydraulic properties were employed to simulate rainfall infiltration of tilled plots using Richards' equation.","The effects of tillage treatment and row direction on rainfall infiltration and surface depressional storage were determined by statistical analysis. The tillage treatments considered were conventional, no-till and disk/chisel, each with contour and up-and-down slope row direction. Among the tillage treatments studied, conventional tillage treatments had lower infiltration depths compared to conservation tillage treatments (chisel/disk and no-till). However, conventional plots with rows on the contour have greater depression storage depths compared to conservation tillage treatments with contour row directions.","A procedure to determine parameters of one-layered and two-layered Green and Ampt infiltration equation was developed and was used to predict rainfall infiltration of crusted and protected Catlin soil. Furthermore, a finite element formulation of the one-dimensional unsaturated water flow equation (Richard's equation) was used to predict rainfall infiltration for crusted and protected tilled field plots. Comparisons of rainfall infiltration depths of crusted plots simulated by Richards' equation and the Green and Ampt equation were made. Richards' equation predicted infiltration of a crusted soil very well while the Green-Ampt model predicted infiltration fairly well.","Using the Green and Ampt parameters, a low pressure center pivot irrigation system design procedure example was used to demonstrate the effect of tillage on infiltration and, thus, the operating pressure of the system. The analysis showed that no-till systems can be more suitable for smaller operating pressure compared to conventional tillage. However, quantification of economics and energy savings involved were beyond the scope of this research.","Made available in DSpace on 2011-05-07T12:20:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 8924901.pdf: 5442835 bytes, checksum: 5a111804296353e6abdddb61bc770c88 (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:39:54Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:16:56-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Effect of tillage on rainfall infiltration and surface depressional storage"]}]}],"canonical_facts":{"dc:contributor":["Ewing, Loyd K."],"dc:creator":["Mohamoud, Yusuf Mohamed"],"dc:date":["2011-05-07T12:20:52Z","10000-01-01","1989"],"dc:description":["Research to evaluate the effects of tillage on rainfall infiltration and surface depressional storage was conducted. A method that generates infiltration, surface depressional storage, detention storage and hydraulic conductivity from data obtained from small field plots receiving simulated rainfall was developed. Values of Manning's resistance coefficient and overland flow velocity were calculated using the detention storage depth. Comparisons between observed and calculated overland flow velocities were made.","A laboratory experiment was conducted to quantify the amount of rainfall intercepted by residue at different rainfall intensities and durations. A maximum of 1.5 mm and 1 mm was intercepted by corn and soybeans, respectively. Laboratory experiments to determine tillage-induced soil hydraulic properties were conducted. Soil hydraulic properties were determined for three common surface conditions of a Catlin tilled soil; freshly tilled, protected (no-till), and crusted condition. These soil hydraulic properties were employed to simulate rainfall infiltration of tilled plots using Richards' equation.","The effects of tillage treatment and row direction on rainfall infiltration and surface depressional storage were determined by statistical analysis. The tillage treatments considered were conventional, no-till and disk/chisel, each with contour and up-and-down slope row direction. Among the tillage treatments studied, conventional tillage treatments had lower infiltration depths compared to conservation tillage treatments (chisel/disk and no-till). However, conventional plots with rows on the contour have greater depression storage depths compared to conservation tillage treatments with contour row directions.","A procedure to determine parameters of one-layered and two-layered Green and Ampt infiltration equation was developed and was used to predict rainfall infiltration of crusted and protected Catlin soil. Furthermore, a finite element formulation of the one-dimensional unsaturated water flow equation (Richard's equation) was used to predict rainfall infiltration for crusted and protected tilled field plots. Comparisons of rainfall infiltration depths of crusted plots simulated by Richards' equation and the Green and Ampt equation were made. Richards' equation predicted infiltration of a crusted soil very well while the Green-Ampt model predicted infiltration fairly well.","Using the Green and Ampt parameters, a low pressure center pivot irrigation system design procedure example was used to demonstrate the effect of tillage on infiltration and, thus, the operating pressure of the system. The analysis showed that no-till systems can be more suitable for smaller operating pressure compared to conventional tillage. However, quantification of economics and energy savings involved were beyond the scope of this research.","Made available in DSpace on 2011-05-07T12:20:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 8924901.pdf: 5442835 bytes, checksum: 5a111804296353e6abdddb61bc770c88 (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:39:54Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:16:56-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI8924901","(UMI)AAI8924901","http://hdl.handle.net/2142/19856"],"dc:language":["eng"],"dc:rights":["Copyright 1989 Mohamoud, Yusuf Mohamed"],"dc:subject":["Engineering, Agricultural"],"dc:title":["Effect of tillage on rainfall infiltration and surface depressional storage"],"dc:type":["text"],"thesis:degree_discipline":["Agricultural Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:14Z"}