Certified Landscape Irrigation Auditor

Which factors can influence infiltration rate?

1. Humidity, temperature, and sunlight

2. Soil type, compactness, and slope

3. Plant type, irrigation method, and weather

4. Water quality, time of day, and drainage

The correct answer is: Soil type, compactness, and slope

Soil type, compactness, and slope are crucial factors that significantly influence infiltration rate. Soil type determines the texture and structure of the soil, which affects how quickly water can move through the soil layers. For instance, sandy soils usually allow for faster infiltration compared to clay soils, which tend to be denser and retain water more effectively. Compactness refers to how tightly packed the soil particles are. When soil is compacted, the pore spaces between the particles become smaller, which can lead to reduced infiltration rates. Conversely, well-aerated soil with less compaction will allow for better water movement. Slope also impacts infiltration. On a steep slope, water tends to run off the surface rather than infiltrating into the ground, while flatter areas may enhance the opportunity for water to percolate into the soil. Therefore, these three aspects—soil type, compactness, and slope—are foundational to understanding how infiltration rates can vary in different landscapes and conditions.