A2 (2015)

Hydrology

The science of water in all its forms (liquid, solid, and gaseous), its circulation and distribution on and over the earth's surface and in the atmosphere.

Interception

The portion of precipitation which is temporarily held on the leaves and stems of the vegetation.

Checkgate

A structure consisting of sliding gates that raises the water level upstream to facilitate its diversion into the branching canal.

1.65 m

The most hydraulically efficient trapezoidal channel section to carry a discharge of 5 m³/s on a bed material with a roughness n of 0.02 and a bottom slope of 1 in 800 should have a bottom width of.

8160 m³

How much water should be applied to a 6 ha farm where the rooting depth is 80 cm if it is in its permanent wilting point? Volumetric moisture contents are 0.15 and 0.32 for permanent wilting point and field capacity, respectively.

17.55 lps

A 16-ft thick confined aquifer with hydraulic conductivity of 500ft/day was tapped by a 4" diameter shallow tubewell. With a radius of influence of 2000 ft, determine the maximum discharge of the STW in liters per second. Assume an allowable drawdown of 10 ft.

4 Hp

Given a shallow tubewell with maximum discharge of 15 lps and a total dynamic head of 7 meters. Determine the power rating of the primemover for the pump if pump and primemover efficiencies are 60 and 55 % respectively.

Rapidly Varied Flow

A hydraulic jump is a classic example of this type of flow.

2.4 Hp

Groundwater is to be pumped from a shallow aquifer for irrigation purposes. The required discharge is 300 gpm. The suction head is 8 ft and the maximum drawdown is 10 ft. The friction and minor losses are 0.45 ft and 0.3 ft, respectively. If the pump efficiency is 60%, the theoretical input power required is.

Route Surveying

Comprised of all survey operations required for design and construction and construction of engineering works such as highways, pipelines, canals, or railroads.

Drawdown

The localized lowering of the static or piezometric water level due to pumping.

Horton's Equation

The infiltration equation based on the exhaustion process.

Steady Non-uniform

The water flowing at a constant rate through a conical pipe is what type of flow?

1774 mm

Determine the average monthly rainfall in a 500 ha watershed based on the rainfall data for July of 5 rainfall gaging stations.

Steady Flow

Type of flow wherein the discharge or flow in a prismatic channel is constant with respect to time.

Runoff

That portion of precipitation that makes its way toward stream channels, lakes or oceans as surface or subsurface flow.

0.74 m/pace

A surveyor counted 55, 53, 53, 54, and 54 paces in walking along a 40-m course laid out on a concrete pavement. What is the surveyor's pace factor?

Anemometer

Instrument used to measure wind speed.

Seismometer

Which instrument is not used in a weather station?

Buffer Strip Cropping

Types of strip cropping which has strips of a grass or legume crop between contour strips of crops in the regular rotation.

Three-segment section broadbase

A type of terrace more common for mechanized farming systems on moderate slopes of 6 to 8 percent.

200 m³/hr

Evaporation in a 19.77 acre farm is 7mm/day and percolation losses is 2 mm/day. What is the design discharge of a canal to be able to deliver a 5-day requirement of the farm in 24 hours if irrigation efficiency is 75%?

e³-1

Evaluate the integral of 3x² from 1 to e.

Virus

Tungro in rice is caused by?

Heifer

Young female cattle under three years of age that has not given birth yet.

Gilt

Young female swine under one year of age, one that has not given birth yet.

479,001,600

In how many different ways can 12 men be arranged in a line?

Time of Concentration

The time required for the most remote point in the watershed to reach the outlet is called?

Head loss is inversely proportional to almost square of the length of pipe.

Which is not true about the head loss of a pipe?

4.14 m

What is the bottom width for the best hydraulic cross-section (best proportion) of a concrete open channel if the design depth is 5 meters and the side slope is 45⁰?

Water Storage Efficiency

The ratio of water stored in the root zone during the irrigation to the water needed in the root zone prior to irrigation, expressed in percent.

Convective Precipitation

Precipitation caused by the rising of warmer, lighter air in colder, denser surroundings.

Gabions

Stones are placed on rectangular wire mesh, piled-up as blocks and tied together to form a reinforced wall or dam structure.

Erosivity

The energy of rainfall that induces erosion is called.

Completely Randomized Design (CRD)

Experimental designs wherein the treatments are randomly arranged over the whole of the experimental materials. It is used when the number of treatments is small and the experimental material is homogenous.