Stream Channel Stability. Appendix H. Hydrologic Measurements on the Typical Soils in the Goodwin Creek Catchment,
SOIL CONSERVATION SERVICE OXFORD MS SEDIMENTATION LAB
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The hydrologic response of typical soils in the Goodwin Creek catchment was investigated. First, the drainage and evaporation characteristics of three upland soils and one bottomland soil were examined on isolated blocs of initially wet soil profiles. Pressure head and hydraulic head relationships were established at various dates following dissipation of the test dose of surface applied water. The change in the total water content of the profile with Lime was computed to determine the subsurface drainage characteristics. The in situ hydraulic conductivity was determined for one soil. This study was supplemented with limited infiltration experiments under ponded surface conditions. Secondly, the soil water regime in bottomland watersheds cropped to cotton was measured for two consecutive years in order to determine the effect of soil water storage on the water budget for unit source watersheds on bottomland areas. Data indicate poor internal drainage characteristics of the upland soils. Runoff hazards are large, especially under wet antecedent conditions. Internal drainage in the tested bottomland soil was nearly an order of magnitude larger than those of the upland soils. The water content measurements on the bottomland unit source watershed showed a typical decline in soil water during the summer months due to evapotranspiration. It also showed the effect of a genetic pan on soil water storage. The data suggest reduced infiltration rates and increased runoff hazards during the wet season.
- Hydrology, Limnology and Potamology
- Soil Mechanics