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Understanding Soil Water Balance and Properties in Applied Hydrology

This document explores key concepts in applied hydrology, focusing on soil water properties, flux, and balance as discussed in sections 4.1 and 4.2 of the reading. Readers will learn about soil particle sizes according to the USDA classification and will analyze water content and energy fluxes relevant to soil water movement, particularly at Freeman Ranch. Insightful quotations from Socrates on knowledge and ignorance inspire a deeper investigation into the importance of understanding these hydrological principles for effective soil management.

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Understanding Soil Water Balance and Properties in Applied Hydrology

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  1. Soil Water Balance • Reading: Applied Hydrology Sections 4.1 and 4.2 • Topics • Soil water properties • Soil water flux • Soil water balance • Quotation for today (from Socrates) "There is only one good, that is knowledge; there is only one evil, that is ignorance."Contributed by Matt Harold.

  2. Table 1. Size limits (diameter in millimeters) of soil separates in the USDA soil textural classification system. Soil Particle Sizes

  3. Soil Texture Triangle Source: USDA Soil Survey Manual Chapter 3

  4. Soil Water Content Soil Water Content

  5. Soil Water Flux, q q = Q/A

  6. Energy fluxes at Freeman Ranch

  7. Evaporation (mm/day) Average = 1.1 mm/day Average = 3.1 mm/day

  8. Soil Water Content

  9. Soil Water Balance at Freeman Ranch E P 0 cm Net Exchange 10 cm 20 cm

  10. Soil Water Tension, y • Measures the suction head of the soil water • Like p/g in fluid mechanics but its always a suction (negative head) • Three key variables in soil water movement • Flux, q • Water content, q • Tension, y

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