During the early phase of rainfall when root zone soil moisture is extremely deficient, the rate of infiltration ?
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Answer: A. Increases
Explanation
At the beginning of rainfall when soil is dry, soil suction is high. This high matric suction causes the infiltration rate to increase and peak rapidly. As soil pores fill with water, suction decreases and infiltration rates decline over time. Infiltration is the process of water entering the soil surface during precipitation events. Initial soil moisture deficit is the primary driver of high early-stage infiltration capacity. Philip and Horton developed mathematical models to describe this decreasing infiltration rate over time.
Hydrologists must accurately model infiltration rates to predict surface runoff and flash floods. Agricultural irrigation scheduling depends on knowing how quickly dry soil absorbs applied water. Urban stormwater management systems must account for reduced infiltration in saturated soils. Reduces describes the later stage of infiltration after the soil surface has become saturated. Remain stagnant is incorrect because infiltration rates change dynamically during storm events. Normal is an imprecise term that fails to describe the transient nature of soil infiltration.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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