Record Display for the EPA National Library Catalog


Main Title Experimental Study of Soil Water Flow Systems Involving Hysteresis.
Author Klut, A. ; Gillha, R. W. ;
CORP Author Colorado State Univ., Fort Collins. Environmental Resources Center.
Year Published 1973
Report Number Completion-51; DI-14-31-0001-3206 ;DI-14-31-0001-3506; OWRR-A-014-COLO; 03760,; A-014-COLO(2)
Stock Number PB-227 236
Additional Subjects Soil water ; Flow ; Hysteresis ; Hydraulic conductivity ; Measurement ; Hydraulic models ; Moisture meters ; Tensiometers ; Pressure measurement ; Drainage ; Numerical analysis ;
Library Call Number Additional Info Location Last
NTIS  PB-227 236 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 114p
The hydraulic functions, i.e., hydraulic conductivity-water content and pressure head-water content relationships, were measured in an unsteady state flow situation on a column of sand using gamma absorption for water content measurements and pressure transducer tensiometry for pressure head measurements. Subsequently, the same flow column was subjected to a boundary condition that caused drainage and rewetting of the column. Measurements of pressure head, hydraulic head and water content versus time were made at various positions. These data were compared with the predictions from soil water flow theory which included the effects of hysteresis in the water content-pressure head relationship. Measured and predicted pressure head-time curves were in reasonable agreement, but measured and predicted water content-time curves were not always in good agreement. (Author)