BRAE 340 Problem set 1
1.
a. Power– kilowatt,
b. Area – acres,
c. Application Rate – in/hr,
d. Pressure – head,
e. Depth – inches,
f. Length – miles,
g. Velocity – ft/sec,
h. Volume – ac-in,
i. Flow Rate – cu-ft/sec
2. Statements (1) and (2) refer to water volumes. Are these Net or Gross volumes? (1) Crop water use (cu-ft) = Seasonal ET (ft) x Crop area (acres) x 43,560 sq-ft/acre (2) Volume applied by system (ac-in) = Application rate (in/hr) x Irrigation time (hr) x Area (acres)
a. (1) is Net; (2) is Gross
b. (1) is Gross; (2) is Gross
c. (1) is Gross; (2) is Net
d. (1) is Net; (2) is Net
3. Statements (1) and (2) refer to water amounts. Are these Net or Gross amounts? (1) Crop water requirement (inches) = ET (in/day) x Days between irrigations. (2) Crop water requirements (ac-ft) = Depth at each irrigation (inches/12) x Crop Area (acres).
a. (1) is Gross; (2) is Net
b. (1) is Gross; (2) is Gross
c. (1) is Net; (2) is Gross
d. (1) is Net; (2) is Net
4. An irrigation system applies a gross amount of 42 inches of water during the growing season. An evaluation determines that: 27 inches goes to satify crop ET; 9 inches runs off and is not collected for reuse; 3 inches passes through the root zone as deep percolation (total), of which 3 inches are beneficial leaching for salt removal; and 1 inch is ET from weeds. What is the irrigation efficiency (%)?
a. 92.9%
b. 78.6%
c. 57.1%
d. 62.9%
e. 71.4%
5. ET, or evapotranspiration, is best described by which of the following?
a. The sum of evaporation during an irrigation and plant water use.
b. The sum of plant transpiration and water evaporated from wet plant or soil surfaces.
c. The sum of water transpirated from plant roots to leaves and evaporated from the leaf surfaces.
d. The sum of water evaporating from plant and soil surfaces.
e. The sum of water leaving the plant through pores in the leaf surfaces and water stored in
a. Power– kilowatt,
b. Area – acres,
c. Application Rate – in/hr,
d. Pressure – head,
e. Depth – inches,
f. Length – miles,
g. Velocity – ft/sec,
h. Volume – ac-in,
i. Flow Rate – cu-ft/sec
2. Statements (1) and (2) refer to water volumes. Are these Net or Gross volumes? (1) Crop water use (cu-ft) = Seasonal ET (ft) x Crop area (acres) x 43,560 sq-ft/acre (2) Volume applied by system (ac-in) = Application rate (in/hr) x Irrigation time (hr) x Area (acres)
a. (1) is Net; (2) is Gross
b. (1) is Gross; (2) is Gross
c. (1) is Gross; (2) is Net
d. (1) is Net; (2) is Net
3. Statements (1) and (2) refer to water amounts. Are these Net or Gross amounts? (1) Crop water requirement (inches) = ET (in/day) x Days between irrigations. (2) Crop water requirements (ac-ft) = Depth at each irrigation (inches/12) x Crop Area (acres).
a. (1) is Gross; (2) is Net
b. (1) is Gross; (2) is Gross
c. (1) is Net; (2) is Gross
d. (1) is Net; (2) is Net
4. An irrigation system applies a gross amount of 42 inches of water during the growing season. An evaluation determines that: 27 inches goes to satify crop ET; 9 inches runs off and is not collected for reuse; 3 inches passes through the root zone as deep percolation (total), of which 3 inches are beneficial leaching for salt removal; and 1 inch is ET from weeds. What is the irrigation efficiency (%)?
a. 92.9%
b. 78.6%
c. 57.1%
d. 62.9%
e. 71.4%
5. ET, or evapotranspiration, is best described by which of the following?
a. The sum of evaporation during an irrigation and plant water use.
b. The sum of plant transpiration and water evaporated from wet plant or soil surfaces.
c. The sum of water transpirated from plant roots to leaves and evaporated from the leaf surfaces.
d. The sum of water evaporating from plant and soil surfaces.
e. The sum of water leaving the plant through pores in the leaf surfaces and water stored in