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Asst Project Engineer (KLDC) -JULY -29, Overseer Gr-I,Ill ACE KARUNAGAPPALLY 7034199928, 9037199928 -

Irrigation 1 .A crop grown entirely with the help of rainfall is called a Natural crop b Wet crop c Dry crop d Rainy crop 2.The mean velocity for a channel of a given depth will keep the channel either from silting or scouring its bed called a Optimum velocity b Critical velocity c Ideal velocity Jd Economic velocity 3.The gross irrigated area less uncultivated land called ulturable area et commanded area ulturable cultivated area dSUnculturable area

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4.A high velocity conduit for conveying water to lower level is called a Hydraulic ramp b~Superchannel cSiphon ~dAqueduct 5.13est suitable canal cross section is aSemi circular b Parabolic c Rectangular d Trapezoidal 6.ln a concrete lined canal permissible velocity of water is a Sm/sec b 4m/sec c 2m/sec d 0.5m/sec 7.The angle between head regulator and the water for smooth emtry of water in a canal is generally kept as (a)80°

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8.An arrangement provided in weir or dam for the free passage of fish from upstream to downstream or vice versa called al Fish ladder bFish pond cFish channel Idnone of these 9.A closed conduit or pipe for supplying water under pressure to turbine is called aPenstock b Pressure pipe c Delive ry pipe d Suction pipe 1 0.A hydrograph is a plot of aPrecipitation against time b Stream flow against time c Surface run off against time d Recorded runoff against time

153he main function of a diversion head work of a canal from a river is ato remove silt b to control floods c to stone water d to raise water level 16..The crop requires irrigation water is called aWet crops b Dry crops c Rabi crops d Kharif crop 1 7.Thequantityof water retained by the material against the pull of ravity is called a Specific b Yield c Posting d Field capacity 18.Top of the weir is called aPeak b Crest c Ridge d Head

liThe infiltration capacity means (a)Maximumrateofaccumulation of water in an area (b) Precipitation -Evaporation loss) perunit time (c)Maximum rate at which water enters into soil (d)Rainfall waterentering subsoil

1 9.Rock fill dam is a~ Rigicl dam bNon- rigid dam cHigh dam jd)Low dam

12.Maximum surface runoff is favaured due to a~ a flash storm bleaf shaped catchment c improved land management l d presence of forest area

20 Gallery is a (a)A passage left in completed dam b An reservation lower ~Apa crt of dam dNone of these

13.Most fertile soil is aAlluvium b black soil c laterite soil d red soil

21 .Free board in a dam is a A type of shutter bName of storage c Margin between water level and top of dam (d) None of these

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14.When a canal and drainage approach each other at the same level, then the structure is called a An aqueduct b Asyphon

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24.Fish ladder is a a Gate provided on the dam b Passage provided for free movement of fish c Regulating device d Used to reduce silt 25.The duty is largest a at the head of main canal b at the head of water course c on the field d same at all places 26.Weirs constructed on permeable foundation are liable to fail due to J al Piping b Crushing cSliding d Overturning 27.The useful moisture of soil is equal to its a Field capacity b Saturation capacity c Moisturecontentatpermanent wilting point (d)none

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a)d rains bcontour canals c valley ca nals d ridge canals

Duty: -Irrigation capacity of a unit water is called Duty

Time factor :

Answers ic 4b 7d 1 c 13a 16a 19b 22c 25c 28b

2c 5d 8a l (c 14 c 17d 20a 23a 26d 29c)

3a 6c 9a 1 a 15b 18b 21c 24b 27a 30a

Points to be noted on Irrigation Paleo : First watering before sowing the crop is called Paleo. Kor watering : The first watering given to the crop when it has grown a few centimeter is called Kor watering This time requires more water than other periods.

Kore depth :

Depth of water required for a crop during kore watering is called kor depth. Optimumcore depth for Rice -19 c.m Wheat -13 .5 c.m Sugarcane -16.5 c.m Kor period : -Kor watering done in a limited period is called Kor period Kor period for Rice -2 to 4 weeks for Wheat -3 to 8 weeks.

Base Period :

29.For standing crops in undulating sandy field is a free flooding b furrow method c sprinkler i rr igation d check method

Crop period -Time in days that

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it is the ratio between number of days the canal has actually run to the number of days the canal supposed to be run called time factor -

Capacity Factor :

Ratio between average discharge of a canal at any point to the full supply discharge of the canal at the same point called capacity factor -

Crop ratio: -Itis the ratio of areas of land irrigated (anticipatorry during twocrop seasons ie Rabi and Kharif Also called Rabi -Kharif ratio .Crop ratio adopted varies from 1:1 to 1:2. Crops classification on irrigation required Dry crop :- crop do not require water from irrigation is called dry crop Only rain water is needed

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28.For cereal crops the most commonly adopted method of irrigation is a free flowing method b check method c furrow method d sprinkling method

30.Canals constructed for draining off water from water logged areas called

inimum Water Level aximum Water Level

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This is the Whole period in days between first watering for the preparation of land for planting crops to the last watering before harvesting .Base period is considering design purpose. -

a crop takes from the instant of sowing to that of its harvesting called crop period Delta :-Total depth of water required for a crop during the entire period is called Delta. '3l'31 . l3slç? , (3110(05 (0)D01) ROM16036 (0)(3(fl) )3C0)lo36)3)S nlo(m)o) 136)01 oimo xni, s3. ofliimcoroloxmo,1 S3(0) 0Z0J 0J(fl6j0), wc1 3o olmooJ 6fl9iC0) (05011 (fl)7)'3? 6)31,60(03 (3110 1 ,th0l6)I7] (102(0,

Wet crop :- Crop cannot grown without water wet crop

Garden crop : Crops requires water throughout the year called garden crops -

Crop seasons

Rabi crop or winter crops Crops sown in autmn(october and ha rv est in sp ri ng (march). Eg.Wheat ,barly mustard tobaco linseed potato etc. ,

KharifcropsormonsoonCrops :-Cropssown bythe beginning of South West monsoon (June & July )and harvested in autumn. (Sep ,Oct,Nov.) Eg : Millet und nut rennialCrops-Cropsrequires water for irrigation throughout the year .Eg .Sugarcane,Fruits vegetables etc Eight month crops :- Crops requires eight months (May -June )to (Dec-April).

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