AREA 2 Flashcards
The height of the levee from the water surface to the top of the levee is called:
Dike height
Freeboard
Side slope
Fetch
Freeboard
This is provided in a pipe drain to prevent seepage:
Core trench
collar
freeboard
frame
Core trench
These two culture systems in open water are considered as enclosure culture systems:
raceways and ponds
ponds and cages
pens and cages
frame
pens and cages
This type of aerator may be excellent in emergencies because it quickly raises the oxygen level in a small area, but is not good in dispersing oxygen throughout the pond:
Diffused bubble aerator
Paddle-wheel aerator
Vertical pump aerator
Aspirating aerator
Paddle-wheel aerator
hese aerators are excellent choices for medium and large ponds where movement of oxygenated water away from the aerator is important:
Diffused bubble and aspirating aerators
Paddle-wheel and aspirating aerators
Vertical pump and bubble aerators
None of the above
Vertical pump and bubble aerators
. In recirculating aquaculture systems (RAS), the conversion of toxic ammonia and intermediate form nitrite to relatively harmless nitrate is called:
fractionation
ozonation
nitrificaiton
denitrification
nitrificaiton
The major aquaculture species farmed in brackish water in the country are:
Oyster and mussels
Milkfish and shrimp
Mudcrab and grouper
Tilapia and milkfish
Milkfish and shrimp
Which of the following is not a major aquaculture species in the Philippines?
carp
salmon
seaweeds
tiger prawn
salmon
This shrimp undergoes 11 larval stages to metamorphose to post larvae:
Giant tiger prawn
Whiteleg shrimp
Giant freshwater prawn
Indian shrimp
Giant freshwater prawn
Penaeid shrimps undergo these larval stages in sequence before they become post larvae:
Nauplius, megalopa, instar
Nauplius, zoea, mysis
Nauplius, mysis, zoea,
Zoea, megalopa, instar
Nauplius, zoea, mysis
The Philippines ranks as the world’s third largest producer of:
shrimp
milkfish
sea cucumber
seaweed
seaweed
.Water like in estuarine areas with intermediate salinity due to the mixing of fresh and sea water is referred to as:
freshwaer
seawater
brakishwater
marinewater
brakishwater
Breeding and growout production of commercially important marine species are done in zonified marine cages which the Bureau of Fisheries and Aquatic Resources refers to as:
Industrial cage parks
Seawater cage farms
Ocean cage parks
Mariculture parks
Mariculture parks
Without additional aeration, a continuous supply of 70 gpm of oxygenated, good quality flow-through water can support approximately:
265 kg fish
300 kg fish
365 kg fish
400 kg fish
265 kg fish
Hydrologic process that refers to the lateral movement of percolating water when it encounters an impervious layer is called
seepage
groundwater flow
baseflow
interflow
interflow
When the rainfall intensity is higher than the infiltration capacity, the actual rate of infiltration is equal to
infiltration capacity
saturated hydraulic conductivity
rainfall intensity
water holding capacity
infiltration capacity
Volume of water that cannot be released from storage in an unconfined aquifer per unit horizontal area per unit decline in water table is called
specific storage
specific yield
specific retention
transmissivity
specific retention
A structure that serves as an outlet of irrigation water into the main farm ditch or service is called
offtake
flow divisor
cross regulator
turnout
turnout
Drainage system layout suitable for draining concave areas is
random
herringbone
gridiron
none of the above
herringbone
The combination of splash and sheet erosion is called
rill erosion
interrill erosion
splash erosion
gully erosion
interrill erosion
Two of the four major criteria for evaluating water quality for irrigation purposes are
pH and salinity
sodicity and pH
turbidity and salinity
salinity and sodicity
salinity and sodicity
The two depths of flow that give the same specific energy are called ________
critical depths
conjugate depths
sequent depths
alternate depths
conjugate depths
The type of precipitation that occurs when air masses converge into a low-pressure area is called
Convective
Cyclonic
Orographic
Frontal precipitation
Cyclonic
The rational equation is applicable for a
flat and small watersheds
flat and large watersheds
sloping and small watersheds
sloping and large watersheds
sloping and small watersheds
Irrigation method most suitable for row crops in mildly sloping areas with low salinity irrigation water
Basin
Border
furrow
corrugation
furrow
Which of the following statements is true?
the average velocity in an open channel is located at 0.6 of the depth measured from the bottom
the average velocity is greater than the surface velocity
the average velocity in an open channel is located at 0.4 of the depth measured from the bottom
the maximum velocity occurs at the surface
the maximum velocity occurs at the surface
The irrigation period increases with
increasing available discharge
decreasing application efficiency
decreasing irrigated area
decreasing management allowable deficit
decreasing management allowable deficit
Drainage system layout suitable for draining isolated wet spots is
.Random
Herringbone
gridiron
none of the above
Random
The field activity performed to determine the hydraulic properties of an aquifer is
Well logging
Pump testing
pumping test
well development
Pump testing
Hydrogeologic formation that contains groundwater but is not capable of transmitting it at sufficient quantities is
aquifer
aquifuge
aquiclude
aquitard
aquiclude
Hydrogeologic formation that contains groundwater that is capable of storing it and transmitting it at sufficient quantities is
aquifer
aquifuge
aquiclude
aquitard
aquifer
Streamflow is the sum of
overland flow and interflow
overland flow and baseflow
interflow and baseflow
surface runoff and baseflow
surface runoff and baseflow
When the rainfall intensity is lower than the infiltration capacity, the actual rate of infiltration is equal to
infiltration capacity
saturated hydraulic conductivity
rainfall intensity
water holding capacity
rainfall intensity
Volume of water that can be released from storage in a confined aquifer per unit horizontal area per unit decline in head is called
specific storage
specific yield
specific retention
storativity
storativity
A remedial measure that can be used to address high bicarbonate concentration in
irrigation water is
leaching
over-irrigation
liming
eutrophication
liming
A structure built along the supplementary farm ditch at the head of the internal farm ditch is called
offtake
cross regulator
flow divisor
turnout
offtake
The depth of water to be evacuated from the drainage area in one day is called
hydraulic conductivity
equivalent depth
drainage requirement
drainage coefficient
drainage coefficient
Type of erosion occurring in channel-like formations that cannot be obliterated by tillage operations is called
stream erosion
gully erosion
rill erosion
sheet erosion
gully erosion
Involves repeated pumping to remove fine materials from the groundwater and extend the radius of influence is
well logging
pumping test
pump testing
well development
well development
Area which contributes runoff or drains water into the reservoir (AMTEC, 2016 - PAES
609:2016).
A. River basin B. Runoff reservoir C. Watershed D. Drainage divide
C
A thermometer that has a constriction above the bulb that permits the mercury to rise in the
capillary tube but does not allow it to descend the capillary tube unless the thermometer is
reset (PAGASA, 2022).
A. Minimum thermometer B. Maximum thermometer C. Air thermometer D. Constrithermometer
B. Maximum thermometer
The science that encompasses the occurrence, distribution, movement and properties of the
waters of the earth and their relationship with the environment (USGS, 2022).
A. Meteorology B. Hydrometeorology C. Hydrology D. Limnology
C
The study of the biological, chemical, and physical features of lakes and other bodies of fresh
water (Oxford Languages, 2022).
A. Meteorology B. Hydrology C. Hydrometeorology D. Limnology
D
A branch of meteorology and hydrology that studies the transfer of water and energy between
the land surface and the lower atmosphere (Wikipedia, 2022).
A. Meteorology B. Hydrometeorology C. Hydrology D. Limnology
B
Heavy rainfall or rain that accumulates at a rate of 3 tenths of an inch (0.3 inch or about 7.5
mm), or more, per hour (US National Weather Service, 2022).
A. Storm B. Typhoon C. Torrential rain D. Heavy rain
C
Dominant form of precipitation in the Philippines.
A. Flood B. Rainfall C. Runoff D. Evaporation
B
Dominant form of precipitation in the Philippines.
A. Flood B. Rainfall C. Runoff D. Evaporation
B
Method of areal rainfall determination done by computing the weighted average.
A. Averaging method B. Polygon Method C. Arithmetic method D. Isohyetal method
C
An instrument to measure depth of rainfall.
A. Rainfall dip stick B. Rain gage C. Bucket D. Rainfall meter
B
Part of rainfall which runs off the soil as surface or subsurface flow.
A. Flood B. Runoff C. Percolation D. Infiltration
B