Water Conservation and Irrigation Quiz

What percentage of freshwater withdrawals in the US are for irrigation uses?

• 37%

• 60%

• 25%

• 50%

Which states in the western US account for 49% of the irrigation water withdrawn?

• California, Nevada, Utah, Wyoming

• California, Texas, Colorado, Montana

• California, Idaho, Colorado, Montana

• Arizona, New Mexico, Oregon, Washington

What is the main advantage of contour-levee irrigation?

• Allows irrigation of soils with rapid permeability

• Low installation costs

• Requires less maintenance

• Uniform application

Which type of irrigation is 90% efficient in water use?

• Sprinkler irrigation

• Drip irrigation

• Subsurface irrigation

• Flooding and flushing

What is the main disadvantage of trickle irrigation?

• Weed growth

• Fertilizer difficulties

• Lack of uniformity

• High cost of piping and filtration equipment

Which type of sprinkler irrigation involves very little labor cost?

• Hand set

• Solid set

• Travelling big gun

• Center pivot

What is the function of a backflow preventer in an irrigation system?

• Regulates the pressure in the irrigation pipes

• Prevents contaminated water from entering the irrigation lines

• Filters particles from entering the irrigation line

• Controls the flow of water

What is the unit used to measure the rate of water movement through irrigation pipes in low flow drip systems?

• Cubic feet per second (cfs)

• Pounds per square inch (psi)

• Gallons per minute (gpm)

• Gallons per hour (gph)

What is the force used to propel water through irrigation pipes called?

• Control valve

• Pressure

• Flow

• Emitter

What is the purpose of a filter in an irrigation system?

• Regulates the pressure in the irrigation pipes

• Filters particles from entering the irrigation line

• Prevents contaminated water from entering the irrigation lines

• Controls the flow of water