Donald C. Slack

Research output: Contribution to journalConference articlepeer-review


A modified R. C. Mein-C. L. Larson model for predicting time to surface saturation was employed to predict ponding under two types of center pivot irrigation systems on two agricultural soils in Minnesota. Initial moisture deficit was taken as the difference between fillable porosity and the initial soil water content; hydraulic conductivity in the wetted zone was taken as the unsaturated hydraulic conductivity corresponding to water content at fillable porosity; and the average suction at the wetting front was taken as the area under the suction-relative conductivity curve betwen initial moisture content and saturation. Results of predictions utilizing these parameters were compared with experimental values. The model did a good job of predicting time to surface ponding but did not perform as well as for predicting volume infiltrated at ponding.

Original languageEnglish (US)
JournalPaper - American Society of Agricultural Engineers
StatePublished - 1978
EventPap ASAE for Winter Meet - Chicago, IL, USA
Duration: Dec 13 1977Dec 16 1977

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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