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Surface Hydraulic Conductivity & Evapotranspiration Impact on Streamflow

Simulation study examining the effects of changing surface hydraulic conductivity and evapotranspiration rates on streamflow proportions. The results show how altering these factors influences evaporation, transpiration, and the distribution of flow as base flow versus return flow.

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Surface Hydraulic Conductivity & Evapotranspiration Impact on Streamflow

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  1. 5 Basin Simulations

  2. 2000-2003 Basin Totals • Changing surface hydraulic conductivity by a factor of 2: • Does not significantly change evaporation or transpiration • Does not significantly change total streamflow • Does significantly change proportion of flow that occurs as base flow vs return flow. For smaller k larger proportion as return flow. • Changing m by a factor of 10: • Does significantly change evaporation and transpiration. For small m (rapid decay of k and less variability in saturation deficit) higher E, T. For large m (slow decay of k and more variability in saturation deficit) smaller E,T. • Does significantly change total streamflow. For small m higher E, T is accompanied by higher streamflow. For large m lower E,T is accompanied by lower streamflow. • Does significantly change proportion of flow that occurs as base flow vs return flow. For small m most of streamflow is from return flow. For large m all of stream flow is from baseflow.

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