Crop Evapotranspiration and Soil Moisture Quiz
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Questions and Answers

What is the term for the ratio of actual crop evapotranspiration to its potential evapotranspiration?

  • Evaporation ratio
  • ET ratio
  • Crop ratio
  • Crop coefficient (correct)
  • When gravitational water has been removed, what is the term for the moisture content of the soil?

  • Field capacity (correct)
  • Specific capacity
  • Gravitational moisture
  • Soil capacity
  • What is the surveying instrument used for determining land areas in topographic maps?

  • Lysimeter
  • Erometer
  • Aerometer
  • Planimeter (correct)
  • Which facility is used for determining the water consumptive use of crops in an open field?

    <p>Lysimeter</p> Signup and view all the answers

    What term is used to describe the time required to cover an area with one application of water during irrigation?

    <p>Irrigation period</p> Signup and view all the answers

    At optimal emitter spacing, what percentage of the wetted diameter estimated from field tests is the drip emitter spacing?

    <p>80%</p> Signup and view all the answers

    What is the albedo of the hypothetical reference crop used to calculate reference crop evapotranspiration?

    <p>0.23</p> Signup and view all the answers

    What instrument is commonly used to measure rainfall?

    <p>Rain gage</p> Signup and view all the answers

    What is the term for the part of rainfall that runs off the soil as surface or subsurface flow?

    <p>Runoff</p> Signup and view all the answers

    At what temperature is the manufacturer's coefficient of variation for emitter discharge determined?

    <p>20°C</p> Signup and view all the answers

    What is the flattest canal side slope ratio?

    <p>1:4</p> Signup and view all the answers

    What is the ratio of runoff over rainfall called?

    <p>Runoff coefficient</p> Signup and view all the answers

    What term is used for the part of rainfall stored in the root zone and available for plant use?

    <p>Effective rainfall</p> Signup and view all the answers

    What is the side slope angle Ө with the horizontal plane for an unlined canal with a side slope ratio (run:rise) of 2:1?

    <p>26.6°</p> Signup and view all the answers

    What is the inverse of the probability of exceedance of a specific hydrologic event called?

    <p>Return period</p> Signup and view all the answers

    Which of the following is the correct formula for calculating the side slope angle Ө with the horizontal plane?

    <p>Ө = arctan(rise/run)</p> Signup and view all the answers

    What is the relationship between the side slope ratio (run:rise) and the side slope angle Ө with the horizontal plane?

    <p>Ө = arctan(rise/run)</p> Signup and view all the answers

    Which airmass lifting process is facilitated by sunlight or heating?

    <p>Convective</p> Signup and view all the answers

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