BRAE 340 Exam 1questions well
answered to pass
Area - correct answer ✔✔Acres
Volume - correct answer ✔✔ac-in
Depth - correct answer ✔✔Inches
Length - correct answer ✔✔Miles
Flow Rate - correct answer ✔✔CFS
Power - correct answer ✔✔Kilowatt
Velocity - correct answer ✔✔ft/sec
Application Rate - correct answer ✔✔in/hr
Pressure - correct answer ✔✔head
Statements (1) and (2) refer to water requirements. Are these Net of Gross requirements?
(1) The drip system must deliver 48 gallons per tree per day.
(2) The sprinklers must apply 36 inches over the course of the irrigation season. - correct answer
✔✔1. Gross
,2. Gross
Statements (1) and (2) refer to water requirements. Are these Net of Gross requirements?
(1) The sprinklers must apply 36 inches over the course of the irrigation season.
(2) The vine requires up to 8 gallons of water per day. - correct answer ✔✔1. Gross
2. Net
An irrigation system applies a gross amount of 48 inches of water during the growing season. An
evaluation determines that: 29 inches goes to satisfy crop ET; 8 inches runs off and is not
collected for reuse; 4.4 inches passes through the root zone as deep percolation (total deep
percolation), of which 1 inch is beneficial leaching for salt removal; and 1 inch is ET from weeds.
What would the efficiency be if the gross application was reduced because the runoff was
elimnated? - correct answer ✔✔Beneficial uses => crop ET + leaching
Eliminating ruoff does not change beneficial use.
New gross applied is equal to original gross applied - runoff
IE = (beneficial use/new gross applied) * 100
The correct answer is: 75.0%
Usually, the most significant beneficial use of water is which of the following?
A. Leaching for salt removal
B. Crop evapotranspiration (ETc)
C. Water use by windbreaks
D. Deep percolation
E. Reservoir evaporation - correct answer ✔✔B
Which of the following choices best defines leaching?
A. Apply soil amendments such as gypsum to chemically neutralize salt in the soil.
, B. Applying biomass to increase the soil's organic matter. This blocks the damaging effects of the
salt.
C. Applying extra water to cause deep percolation which washes salts below the root zone.
D. Applying special treatment to cleanse ("leach") the salt from the irrigation water before
irrigation.
E. Applying extra water which runs off, carrying salt with it. - correct answer ✔✔C
A grass area uses about 1.7 inches per week. How many gallons of water per day does 1.1 acres
of turf grass use? - correct answer ✔✔in/week x 1 week/7 days = in/day
in/day x acres x 1 ft/12 in = ac-ft/day
ac-ft/day x 43560 sq-ft/acre x 7.48 gal/cu-ft = gal/day
The correct answer is: 7253.6
A grass area uses about 3.2 inches per week. How many acre-feet of water per day does 28460
square feet of turf grass use? - correct answer ✔✔in/week x 1 week/7 days x 1 ft/12 inches =
ft/day
ft/day x sq-ft = cu-ft/day
cu-ft/day x 1 acre/43560 sq-ft = ac-ft/day
The correct answer is: 0.025
456775 gallons of water are added to a reservoir (with straight sides) covering 3.4 acres. How
many inches does the water level rise after the water is added? - correct answer ✔✔gallons ÷
7.48 gal/cu-ft = cu-ft
cu-ft ÷ acres ÷ 43560 sq-ft/acre = ft
ft x 12 in/ft = inches
The correct answer is: 4.9
answered to pass
Area - correct answer ✔✔Acres
Volume - correct answer ✔✔ac-in
Depth - correct answer ✔✔Inches
Length - correct answer ✔✔Miles
Flow Rate - correct answer ✔✔CFS
Power - correct answer ✔✔Kilowatt
Velocity - correct answer ✔✔ft/sec
Application Rate - correct answer ✔✔in/hr
Pressure - correct answer ✔✔head
Statements (1) and (2) refer to water requirements. Are these Net of Gross requirements?
(1) The drip system must deliver 48 gallons per tree per day.
(2) The sprinklers must apply 36 inches over the course of the irrigation season. - correct answer
✔✔1. Gross
,2. Gross
Statements (1) and (2) refer to water requirements. Are these Net of Gross requirements?
(1) The sprinklers must apply 36 inches over the course of the irrigation season.
(2) The vine requires up to 8 gallons of water per day. - correct answer ✔✔1. Gross
2. Net
An irrigation system applies a gross amount of 48 inches of water during the growing season. An
evaluation determines that: 29 inches goes to satisfy crop ET; 8 inches runs off and is not
collected for reuse; 4.4 inches passes through the root zone as deep percolation (total deep
percolation), of which 1 inch is beneficial leaching for salt removal; and 1 inch is ET from weeds.
What would the efficiency be if the gross application was reduced because the runoff was
elimnated? - correct answer ✔✔Beneficial uses => crop ET + leaching
Eliminating ruoff does not change beneficial use.
New gross applied is equal to original gross applied - runoff
IE = (beneficial use/new gross applied) * 100
The correct answer is: 75.0%
Usually, the most significant beneficial use of water is which of the following?
A. Leaching for salt removal
B. Crop evapotranspiration (ETc)
C. Water use by windbreaks
D. Deep percolation
E. Reservoir evaporation - correct answer ✔✔B
Which of the following choices best defines leaching?
A. Apply soil amendments such as gypsum to chemically neutralize salt in the soil.
, B. Applying biomass to increase the soil's organic matter. This blocks the damaging effects of the
salt.
C. Applying extra water to cause deep percolation which washes salts below the root zone.
D. Applying special treatment to cleanse ("leach") the salt from the irrigation water before
irrigation.
E. Applying extra water which runs off, carrying salt with it. - correct answer ✔✔C
A grass area uses about 1.7 inches per week. How many gallons of water per day does 1.1 acres
of turf grass use? - correct answer ✔✔in/week x 1 week/7 days = in/day
in/day x acres x 1 ft/12 in = ac-ft/day
ac-ft/day x 43560 sq-ft/acre x 7.48 gal/cu-ft = gal/day
The correct answer is: 7253.6
A grass area uses about 3.2 inches per week. How many acre-feet of water per day does 28460
square feet of turf grass use? - correct answer ✔✔in/week x 1 week/7 days x 1 ft/12 inches =
ft/day
ft/day x sq-ft = cu-ft/day
cu-ft/day x 1 acre/43560 sq-ft = ac-ft/day
The correct answer is: 0.025
456775 gallons of water are added to a reservoir (with straight sides) covering 3.4 acres. How
many inches does the water level rise after the water is added? - correct answer ✔✔gallons ÷
7.48 gal/cu-ft = cu-ft
cu-ft ÷ acres ÷ 43560 sq-ft/acre = ft
ft x 12 in/ft = inches
The correct answer is: 4.9
