Which of the following methods of applying water may be used on rolling land ?

The value of Sodium Absorption Ratio for high sodium water lies between

Optimum depth of kor watering for rice is

Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as

The duty is largest

The “outlet discharge factor” is the duty at the head of

The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be

For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of

The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as

The water utilizable by plants is available in soils mainly in the form of

The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called

With the increase in the quantity of water supplied, the yield of most crops

Hydrograph is the graphical representation of

Infiltration rate is always

The depth of water required to bring the soil moisture content of a given soil upto its field capacity is called

Infiltration capacity

Infiltration is the

If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration rate will be

Cyclonic precipitation is caused by lifting of an air mass due to

Which of the following is a non-recording raingauge ?

A raingauge should preferably be fixed

Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?

Rate of evaporation from a water surface increases if i) difference of vapour pressure between water and air is increased ii) velocity of wind is decreased iii) concentration of soluble solids in water is decreased The correct answer is

A 70% index of wetness means

Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?

Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas. Reason R : Rainfall gradient is steep. Select your correct answer according to the coding system given below :

When surface of transpiration is submerged under water, then potential evapotranspiration is

Unit of runoff in M.K.S. system is

The runoff increases with

The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be

A current meter is used to measure the

If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be

The rainfall on five successive days were measured as 100 mm, 80 mm, 60 mm, 40 mm and 20 mm respectively. If the infiltration index or the storm loss rate for the catchment area is earlier estimated as 50 mm/day, the total surface run off will be

The normal annual precipitation at stations X, A, B and C are 700 mm, 1000 mm, 900 mm and 800 mm respectively. If the storm precipitation at three station A, B and C were 100 mm, 90 mm and 80 mm respectively, then the storm precipitation for station X will be

The best unit duration of storm for a unit hydrograph is

The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by

The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of

S-hydrograph is used to obtain unit hydrograph of

The relation between probability (P) and recurrence interval (T) is given by

Dimensions of coefficient of transmissibility are

If d is the depth of the aquifer through which water is flowing, then the relationship between permeability k and transmissible T is given by

An artesian aquifer is the one where

A deep well

A multipurpose reservoir is the one which is

The useful storage is the volume of water stored in the reservoir between

The water stored in the reservoir below the minimum pool level is called

For a flood control reservoir, the effective storage is equal to

Trap efficiency of a reservoir is a function of

The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after

The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are i) Water pressure ii) Self weight iii) Uplift iv) Pressure due to earthquake The correct answer is

When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be where w is unit weight of water and H is the depth of water.

The uplift pressure on a dam can be controlled by i) constructing cutoff under upstream face ii) constructing drainage channels bet-ween the dam and its foundation iii) by pressure grouting in foundation The corret answer is

The uplift pressure on the face of a drainage gallery in a dam is taken as

Horizontal acceleration due to earthquake results in

Hydrodynamic pressure due to earthquake acts at a height of

The major resisting force in a gravity dam is

When the reservoir is full, the maximum compressive force in a gravity dam is produced

The maximum permissible eccentricity for no tension at the base of a gravity dam is

Presence of tail water in a gravity dam i) increases the principal stress ii) decreases the principal stress iii) increases the shear stress iv) decreases the shear stress The correct answer is

For wave action in dams, the maximum height of freeboard is generally taken to be equal to where hw is height of wave.

As compared to gravity dams, earthen dams

The most suitable material for the central impervious core of a zoned embankment type dam is

Seepage through embankments in an earthen dam is controlled by

Seepage through foundation in an earthen dam is controlled by providing

The flow of water after spilling over the weir crest in chute spillway and side channel spillway respectively are

The discharge passing over an ogee spillway is given by where, L is effective length of spillway crest and H is the total head over the spillway crest including velocity head.

Coefficient of discharge of an ogee spillway

Which of the following spillways is least suitable for an earthen dam ?

In case of non-availability of space due to topography, the most suitable spillway is

In a chute spillway, the flow is usually

For the upstream face of an earthen dam, the most adverse condition for stability of slope is

If there are two canals taking off from each flank of a river, then there will be

Generally the weir is aligned at right angles to the direction of the main river current because

The main function of a divide wall is to

A divide wall is provided

As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at

Silt excluders are constructed on the

According to Khosla’s theory, the exit gradient in the absence of a downstream cutoff is

The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by

The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is

If the critical shear stress of a channel is xc, then the average value of shear stress required to move the grain on the bank is

As per Lacey’s theory, the silt factor is

Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey’s theory will be

Which of the following canal structures is used to remove surplus water from an irrigation channel into a natural drain ?

For a proportional outlet, the flexibility is

The sensitivity of a rigid module is

Which of the following is a flexible outlet ?

A straight glacis type fall with a baffle platform and a baffle wall is called

Which of the following types of falls use parabolic glacis for energy dissipation ?

In a Sarda type fall, rectangular crest is used for discharge upto

Which of the following can be used as a meter fall ?

Vertical drop fall is satisfactory for a height upto

Which of the following canal outlets maintains a constant discharge ?

The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called

The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in

If the R.L’s of canal bed level and high flood level of drainage are 212.0 m and 210.0 m respectively, then cross drainage work will be

The aqueduct or superpassage type of works are generally used when

An aggrading river is a

Tortuosity of a meandering river is the ratio of

. The meander pattern of a river is developed by

. The main cause of meandering is

. Tortuosity of a meandering river is always

. Select the correct statement.

. River training for depth is achieved by

. Main purpose of mean water training for rivers is

. If D is the depth of scour below original bed, then the width of launching apron is generally taken as

. Study the following statements. i) Levees are constructed parallel to river flow, ii) Spurs are constructed parallel to river flow, iii) Levees are constructed transverse to river flow, iv) Spurs are constructed transverse to river flow. The correct answer is

. A repelling groyne is aligned

. A river training work is generally required when the river is

. A river bend characterized by silting

. Select the incorrect statement.

. A land is known as waterlogged

. Lining of irrigation channels

. A runoff river plant is

. The net speed under which the turbine reaches its peak efficiency is called

. A runoff river plant

. The net head under which the turbine reaches its peak efficiency at synchronous speed is called

. The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero will be equal to

. A hydroelectric scheme operating under a head of 80 m will be classified as

. A hyetograph is a graphical representation of

. Variability of rainfall is i) largest in regions of high rainfall ii) largest in coastal areas iii) largest in regions of scanty rainfall The correct answer is

. In India, which of the following is adopted as standard recording raingauge ?

. The maximum average depth due to one day storm over an area of 100 km2 is 100 mm. Depth-Area-Duration (DAD) curves indicate that for the same area of 100 km2 the maximum average depth for a 3 hour storm will be

. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by

. The most suitable chemical which can be applied to the water surface for reducing evaporation is

. Interception losses are due to i) evaporation ii) transpiration iii) stream flow The correct answer is

. A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If

. Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?

. To determine the discharge at a section in a stream from its rating curve, the required data are i) slope of water surface at the section ii) stage at the section iii) current meter readings at the section The correct answer is

. The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000)willbe

. The stream which does not have any base flow contribution is called

. The flow-mass curve is graphical representation of

. If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that

. The shape of recession limb of a hydrograph depends upon

. Instantaneous unit hydrograph is a hydrograph of i) unit duration ii) unit rainfall excess iii) infinitely small duration iv) infinitely small rainfall excess The correct answer is

. For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is

. A unit hydro graph has one unit of

. The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be

. To estimate the magnitude of a flood with a return period of T years, Gumbel’s distribution method requires the following data pertaining to annual flood series i) mean value ii) standard deviation iii) length of record iv) coefficient of skew The correct answer is

. For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is

. If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be