ABELE Review Class 2023 - Area 2 Flashcards
Froude number in relation to Critical Flow Classification
Fr > 1, flow is _______
Fr < 1, flow is _______
Fr = 1, flow is _______
- Fr > 1.0, flow is supercritical;
- F < 1.0, flow is subcritical;
- Fr = 1, critical flow.
A storm occurred in two similar watersheds, Glads and Karl, both has same area. Glads watershed is long and slender while Karl watershed is short but wide. Which watershed will experience the earliest and the highest peak flow assuming that the rainfall over the watershed is evenly distributed?
Karl Watershed
In SFR, soil profile within ____ shall be analyzed.
1.5 (minimum depth)
The volume of water stored in reservoir between the minimum water level and normal water level.
Active Storage
Geologic formation arranged in decreasing economic considerations
Aquiclude
Aquitard
Aquifer
Aquifuge
Aquifer, Aquiclude, Aquitard, Aquifuge
Drainage that divides the field in half to be drained
Double Main
A point of fixed location which can be used as reference point.
Bench mark
Defined as the resistance of the soil to both detachment and transport.
Soil erodibility
Structures that conveys water across and above natural depressions such as creeks and rivers.
Bench flume
Interior angles of a regular dodecagon
150 degrees
Volume of voids over total volume of soil
Porosity
An area that topographically appears to contribute all the water that passes through a specified cross section of a stream
Watershed
Interflow is also called
subsurface flow
device used to measure velocity
current meter
Subsurface drain system wherein laterals join the submain on both sides alternately.
herringbone
The moisture content of the soil when gravitational water has been removed.
field capacity
It is the water retained about individual soil particles by molecular action and can be removed only by heating.
hygroscopic water
It refers to the composite parts of the irrigation system that divert water from natural bodies of water such as rivers, streams and lakes
Headworks
Closed conduit designed to convey canal water in full and under pressure running condition, to convey canal water by gravity under roadways, railways, drainage channels and local depressions.
Inverted siphon
Type of precipitation associated with the movement of air masses from high pressure regions to low-pressure regions.
Cyclonic Precipitation
Lateral movement of water when it reaches the impervious layer.
interflow
PAES Shallow Tube Well:
Which of the following do not belong to surface investigation.
a. Remote Sensing
b. Geologic Exploration
c. Test drilling
d. Electrical resistivity method
c. Test drilling
PAES Shallow Tube Well:
Which of the following do not belong
to subsurface investigation.
a. Geologic Exploration
b. test drilling
c. Water level measurement
d. Resistivity logging
a. Geologic Exploration
Minimum height and pond area of Small Water Impounding Project (SWIP)
Minimum height = 5 m
Minimum pond area = 15 ha
Binomial expansion: what is the 6th
term of (a-3b)^9
6th term = -30618a^4b^5
A communication antenna is on top of a building. You are 100 ft from the building. Using a transit, you measure the angle of elevation of the bottom of the antenna as 20.6° and the angle of elevation of the top of the antenna as 27.3°. How tall is the antenna?
14.03 ft
A mean annual runoff of 1 m3/s from catchment of area 31.54 km2 represent an effective rainfall of ___?
0.9999 m or 100 cm
A cylinder was pushed into the soil. The cross-sectional area of the cylinder was 0.025 m2. The length of the soil column within the cylinder was 0.30 m. The weight of the soil within the cylinder was 9.5 kg when it was dried. The weight of the soil before drying was 11.4 kg. Determine the bulk density of the soil
1266.67 kg/m3
A watershed has an area of 300ha. Due to a 10cm rainfall event over the watershed, a streamflow is generated and at the outlet of the watershed it last for 10hrs. Assuming a runoff/rainfall ratio of 0.2 for this event, the average streamflow rate at the outlet in the period of 10hrs is.
1.67 m3/s
Determine the 10-year period peak runoff for a 80-hectare watershed having a runoff coefficient of 0.4. The maximum length of flow of water is 610 meters and the fall along this path is 6.0 meters. The rainfall intensity for that return period is
101.25 mm/hr having a duration equal to the time of concentration.
9 m3/s
After a 2-hour storm, a station downstream from a 45 square mile drainage basin measures 9400 cfs as a peak discharge and 3300 acre-feet as total runoff. Find the 2-hour unit hydrograph peak discharge.
6800 cfs
A horizontal fully flowing 4 in pipe is discharging water. The x and y-coordinate of the water trajectory is measured from the end of the pipe are 1.5 m and 0.8 m, respectively. Assuming that the coefficient of discharge is 1.0, what is the discharge of the pipe?
30 lps
What is the depth of water in a trapezoidal channel with a side slope of 2 and carrying a 2.5 m3/ s water flow? The channel’s bottom width is 1.5 meters and the flowing water has a velocity of 0.8 m/s.
0.93 m
How many sprinklers with spacing of 7m x 7m are needed to irrigate a rectangular piece of land 125 m x 190 m if the laterals are set parallel to the longer side of the field?
486 sprinklers
What is the discharge in each sprinkler nozzle to irrigate a rectangular piece of land 150m x 180m if the laterals are set parallel to the longer side of the field. Sprinkler spacing is 6m x 6m, irrigation water requirement is 150 mm and irrigation period is 6 hours
0.250 lps
The theoretical flow velocity in an orifice is 4 m/s, what is the height of water flowing the center of the orifice
0.82 m
