ABELE Review Class 2023 - Area 2

Question 1

Froude number in relation to Critical Flow Classification

Fr > 1, flow is _______
Fr < 1, flow is _______
Fr = 1, flow is _______

Answer 1

• Fr > 1.0, flow is supercritical;
• F < 1.0, flow is subcritical;
• Fr = 1, critical flow.

Question 2

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?

Answer 2

Karl Watershed

Question 3

In SFR, soil profile within ____ shall be analyzed.

Answer 3

1.5 (minimum depth)

Question 4

The volume of water stored in reservoir between the minimum water level and normal water level.

Answer 4

Active Storage

Question 5

Geologic formation arranged in decreasing economic considerations

Aquiclude
Aquitard
Aquifer
Aquifuge

Answer 5

Aquifer, Aquiclude, Aquitard, Aquifuge

Question 6

Drainage that divides the field in half to be drained

Answer 6

Double Main

Question 7

A point of fixed location which can be used as reference point.

Answer 7

Bench mark

Question 8

Defined as the resistance of the soil to both detachment and transport.

Answer 8

Soil erodibility

Question 9

Structures that conveys water across and above natural depressions such as creeks and rivers.

Answer 9

Bench flume

Question 10

Interior angles of a regular dodecagon

Answer 10

150 degrees

Question 11

Volume of voids over total volume of soil

Answer 11

Porosity

Question 12

An area that topographically appears to contribute all the water that passes through a specified cross section of a stream

Answer 12

Watershed

Question 13

Interflow is also called

Answer 13

subsurface flow

Question 14

device used to measure velocity

Answer 14

current meter

Question 15

Subsurface drain system wherein laterals join the submain on both sides alternately.

Answer 15

herringbone

Question 16

The moisture content of the soil when gravitational water has been removed.

Answer 16

field capacity

Question 17

It is the water retained about individual soil particles by molecular action and can be removed only by heating.

Answer 17

hygroscopic water

Question 18

It refers to the composite parts of the irrigation system that divert water from natural bodies of water such as rivers, streams and lakes

Answer 18

Headworks

Question 19

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.

Answer 19

Inverted siphon

Question 20

Type of precipitation associated with the movement of air masses from high pressure regions to low-pressure regions.

Answer 20

Cyclonic Precipitation

Question 21

Lateral movement of water when it reaches the impervious layer.

Answer 21

interflow

Question 22

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

Answer 22

c. Test drilling

Question 23

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

Answer 23

a. Geologic Exploration

Question 24

Minimum height and pond area of Small Water Impounding Project (SWIP)

Answer 24

Minimum height = 5 m
Minimum pond area = 15 ha

Question 25

Binomial expansion: what is the 6th term of (a-3b)^9

Answer 25

6th term = -30618a^4b^5

Question 26

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?

Answer 26

14.03 ft

Question 27

A mean annual runoff of 1 m3/s from catchment of area 31.54 km2 represent an effective rainfall of ___?

Answer 27

0.9999 m or 100 cm

Question 28

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

Answer 28

1266.67 kg/m3

Question 29

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.

Answer 29

1.67 m3/s

Question 30

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.

Answer 30

9 m3/s

Question 31

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.

Answer 31

6800 cfs

Question 32

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?

Answer 32

30 lps

Question 33

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.

Answer 33

0.93 m

Question 34

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?

Answer 34

486 sprinklers

Question 35

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

Answer 35

0.250 lps

Question 36

The theoretical flow velocity in an orifice is 4 m/s, what is the height of water flowing the center of the orifice

Answer 36

0.82 m