Time Allowed: Three
Hours Maximum Marks: 200
SECTION B
5.
Answer any four sub-parts not exceeding 150
words for each sub-part:
(a)
(i) Mention five different methods to increase
yield potential of an area where poor quality irrigation water is used.
(iii)
Determine the depth of irrigation water which would
change 50 cm depth of loam soil into saline condition, if EC of irrigation
water is 1 milliohms/ cm. The bulk density of soil is 1.3 gm/ cm³, the density
of water is 1 gm/cm³ and saturation percentage of soil is 40.
(b)
Explain modified Penman formula to calculate
evapotranspiration rate.
(c)
Calculate the most efficient bottom which for a drainage
channel to carry a flow 2 m deep in clay soil. Compute the velocity and
discharge capacity of the channel if the channel gradient is 0.05%. Permissible
velocity in channel in clay soil is 1.2 m/sec and n= 0.035.
(d)
What are the benefits of drainage? Mention five
different types of land which require drainage.
(e)
Differentiate between drilled wells and cavity
tube wells.
6.
(a) Explain Hooghoudt’s equation with all
assumptions and find out mathematical derivative for drain spacing.
(b)
Explain design considerations for a concrete grain bin.
(c) Name five points to be considered for
selection of site or pumping tests.
7.
(a)
Discuss procedure to design an efficient border irrigation system.
(b) Mention effect of speed and impeller
diameter on pump performance.
(c)
Write short notes on:
(i) Bag storage structure (ii) Morai
(iii) Pen barn
8.
(a) A sprinkler irrigation system is to be
designed to irrigate 10 hectares of vegetable crops in deep silt loam soil in
moderate dry climate. The field is flat. Determine the limiting rate of application,
the irrigation period, the net depth of water per application, the depth of
water pumped for application and he required system capacity in hectare
centimeters per day. Assume system operation 14 hours each day and determine
pump capacity, limiting application rate is 1.3 cm/ hr, moisture holding
capacity of soil may be taken as 9.5 cm/m depth/. The root zone depth is 60 cm;
peak rate of moisture used by crop is 5 mm/day water application efficiency is
75%.
(b) Write short notes on:
(i) Soil wetness (ii)
Soil consistency
(iii)
Saline and alkali soils (IV)
Pressure plate apparatus
(v)
Cavitation
No comments:
Post a Comment