A2 - Recalled 1 (2015)

Question 1

Minimum trajectory angle of sprinkler

Answer 1

10-25 degrees

Question 2

allowable percentage depletion of most crops

Answer 2

50%

Question 3

soil moisture tension with 15 atmosphere

Answer 3

permanent wilting point

Question 4

the ratio of water beneficially used on the project, farm, or field to the amount of water delivered to the farm

Answer 4

water use efficiency

Question 5

basic irrigation method for lowland farming

Answer 5

basin irrigation

Question 6

irrigation method with high cost but low operation cost

Answer 6

overhead irrigation

Question 7

irrigation method wherein water is directed to the base of the plant and is applied to the soil through small orifice

Answer 7

drip or trickle irrigation

Question 8

laterals enter the submain from one side only to minimize the double drainage that occurs near the submain

Answer 8

gridiron layout

Question 9

depth of shallow tube well

Answer 9

20 m or 60 ft

Question 10

equation for evapotranspiration computation

Answer 10

penman-montieth equation

Question 11

precipitation results from mechanical lifting of air mass over mountain barriers

Answer 11

orographic rainfall

Question 12

travels over the ground and through the channels to reach the outlets

Answer 12

runoff

Question 13

a hydrograph with a unit volume of direct runoff for a given storm duration

Answer 13

unit hydrograph

Question 14

combination of splash and sheet erosion

Answer 14

interrill

Question 15

flow greater than the critical flow

Answer 15

supercritical flow

Question 16

type of flow wherein the discharge or flow in a prismatic channels is constant with respect to time

Answer 16

steady flow

Question 17

irrigation components, related to flow and head

Answer 17

head gates

Question 18

uses a thin wall of plastic, butyl, concrete, steel or wood to barrier against seepage through the wall

Answer 18

full diaphragm type

Question 19

type of precipitation in the philippines

Answer 19

rain

Question 20

referred to as rainfall

Answer 20

precipitation

Question 21

standard height of an earth embankment

Answer 21

not exceeding 15 meters

Question 22

an instrument used to determine the wind speed

Answer 22

anemometer

Question 23

measures atmospheric humidity

Answer 23

hygrometer

Question 24

A mathematical expression for the macroscopic flow of water through a porous system. It says that the discharge rate q is proportional to the gradient in the hydraulic head and the hydraulic conductivity

Answer 24

Darcy’s law

Question 25

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

Answer 25

headworks

Question 26

a thin film of soil layer detached and transported by water flowing on the land surface.

Answer 26

sheet erosion

Question 27

the type of surveying in which the surface of the earth is considered as a plane, or in which its spheroidal shape is neglected, with regard to horizontal distances and directions.

Answer 27

plane surveying

Question 28

the recommended pressure head variation in the lateral between the first and last sprinkler

Answer 28

20%

Question 29

what is the formula for the universal soil loss equation

Answer 29

E = RKLSCP

Question 30

Values of the USLE

Answer 30

E - annual soil erosion rate R - rainfall-runoff erosivity factor K - soil erodibility factor L - slope length factor S - slope factor C - cover and crop management factor P - erosion control practices or conservation practice factor

Question 31

soil property which describes the ability of the soil to transmit water

Answer 31

hydraulic conductivity

Question 32

the surface is rarely wet since the water is supplied from the soil underneath. This requires complete control of the water table so that the root zone is kept relatively free of excess water but is continually supplied with capillary moisture during the cropping season.

Answer 32

sub-irrigation

Question 33

what do you call the mountain side, with reference to the wind direction in which the air masses passing through it are cold and dry.

Answer 33

leeward

Question 34

the equation used in current meters is V=a+bN. what does "a" signifies?

Answer 34

starting velocity

Question 35

a type of survey that deals with the contour of the surveyed location

Answer 35

topographic surveying

Question 36

a type of geological formation underground that is a saturated formation of the earth. It not only stores the water but also yields it in adequate quantity. Main source of groundwater application.

Answer 36

aquifer

Question 37

an aquifer which has free water surface- which means the water table exists for this type of aquifer.

Answer 37

unconfined aquifer

Question 38

an aquifer that is trapped between 2 impermeable beds. The water in this type of aquifer will be under greater pressure which is greater than atmospheric pressure.

Answer 38

confined aquifer

Question 39

a saturated formation that permits water through it but does not yield water in sufficient quantity. Sandy clay is a n example of this formation.

Answer 39

aquitard

Question 40

a geological formation which is impermeable to the flow of water. It contains a large amount of water in it but does not permit water through it and also does not yield water.

Answer 40

aquiclude

Question 41

an impermeable geological formation which is neither porous nor permeable- which means it cannot store water in it and at the same time it cannot permit water through it.

Answer 41

aquifuge

Question 42

Water storage: yes permeability of water: permeable yield of water: yes transmit: yes

Answer 42

aquifer

Question 43

Water storage: yes permeability of water: party permeable yield of water: yes, but slow yielding transmit: yes

Answer 43

aquitard

Question 44

Water storage: yes permeability of water: impermeable yield of water: do not yield transmit: no

Answer 44

aquiclude

Question 45

Water storage: no permeability of water: impermeable yield of water: do not yield transmit: no

Answer 45

aquifuge

Question 46

type of surveying in which the mean surface of the earth is considered as a plane and the spheroidal shape is neglected

Answer 46

plane surveying

Question 47

type of surveying in which the shape of the earth is taken into account

Answer 47

geodetic surveying

Question 48

for the preparation of maps of large extents of territory

Answer 48

trigonometrical surveying

Question 49

a type of survey determines the relative locations of points (places) on the earth's surface by measuring horizontal distances, differences in elevation and direction

Answer 49

topographic surveying

Question 50

the science of measurement and description of features which affect maritime navigation, maritime construction, dredging, offshore wind farms, and other related activities.

Answer 50

hydrographic surveying

Question 51

pump used on shallow tube well

Answer 51

centrifugal or jet pumps

Question 52

flow of water to the propeller of the propeller pump

Answer 52

axial

Question 53

forms in the aquifer around a pumping well as the water level decline

Answer 53

pumping cone

Question 54

it is the bouncing of sand grains as they are picked up, carried along, and dropped repeatedly by flowing water.

Answer 54

saltation

Question 55

Fr = 1

Answer 55

critical flow

Question 56

Fr > 1

Answer 56

supercritical flow

Question 57

Fr < 1

Answer 57

subritical flow

Question 58

it is used for 24-30% slope, contours cut into the hill slope in a step-like formation

Answer 58

bench terrace

Question 59

it is used for 9-24% slope, for maximum soil and water conservation

Answer 59

zingg/ conservation bench terrace

Question 60

stones are placed in a rectangular wire mesh, piled as blocks tied together, similar to check dams

Answer 60

gabions

Question 61

a method of irrigation in which parallel strips are used where the water flows down at a nearly uniform depth.

Answer 61

border irrigation

Question 62

in this method, water is applied to the crop field using small parallel channels to favor water infiltration while advancing down the field.

Answer 62

furrow irrigation

Question 63

darcy's law states that the flow of water through a porous medium is proportional to the

Answer 63

medium's hydraulic conductivity

Question 64

darcy's law states that the flow of water through a porous medium is inversely proportional to the

Answer 64

length of flow path