This document discusses waterlogging, which occurs when excessive moisture deprives crop roots of proper aeration. It can be caused by over-irrigation, seepage from canals/high lands, inadequate drainage, or excessive rain. Effects include difficult cultivation, weed growth, reduced temperature, and crop yield losses. Remedies include reducing irrigation intensity, improving drainage systems, lining canals to reduce seepage, and installing subsurface tile drains or surface drains to remove excess water. The document describes different tile drain layout systems used depending on land topography.
Canal fall- necessity and location- types of falls- Cross regulator and
distributory head regulator- their functions, Silt control devices, Canal
escapes- types of escapes.
Topics:
1. Causes of Failures of Weirs on Permeable Foundations
2. Bligh’s Creep Theory
3. Lane’s Weighted Creep Theory
4. Khosla’s Theory
5. Application of Correction Factors
6. Launching Apron
WEIRS VERSUS BERRAGE
TYPES OF WEIRS
COMPONENT PARTS OF A WEIR
CAUSES OF FAILURE OF WEIRS & THEIR REMEDIES
DESIGN CONSIDERATIONS
DESIGN FOR SURFACE FLOW
DESIGN OF BARRAGE OR WEIR
Types- selection of the suitable site for the diversion headwork components
of diversion headwork- Causes of failure of structure on pervious foundation- Khosla’s theory- Design of concrete sloping
glacis weir.
Canal fall- necessity and location- types of falls- Cross regulator and
distributory head regulator- their functions, Silt control devices, Canal
escapes- types of escapes.
Topics:
1. Causes of Failures of Weirs on Permeable Foundations
2. Bligh’s Creep Theory
3. Lane’s Weighted Creep Theory
4. Khosla’s Theory
5. Application of Correction Factors
6. Launching Apron
WEIRS VERSUS BERRAGE
TYPES OF WEIRS
COMPONENT PARTS OF A WEIR
CAUSES OF FAILURE OF WEIRS & THEIR REMEDIES
DESIGN CONSIDERATIONS
DESIGN FOR SURFACE FLOW
DESIGN OF BARRAGE OR WEIR
Types- selection of the suitable site for the diversion headwork components
of diversion headwork- Causes of failure of structure on pervious foundation- Khosla’s theory- Design of concrete sloping
glacis weir.
An agricultural land is said to be waterlogging when the soil pores within the roof zone of the crops are saturated to such an extent that normal circulation of air within the soil pores is totally cut off and productivity of soil is affected. Waterlogging generally occurs because of over-irrigation , high water table and the poor water management.
The yield of crop is adversely affected when the depth of water table is equal to or less then the one given below.
chapter 5.pptx: drainage and irrigation engineeringmulugeta48
Increased aeration of the soil;
Stabilized soil structure;
Higher and more diversified crop production;
Better workability of the land;
Earlier planting dates;
Reduction of peak discharges by an increased temporary storage of water in the soil
decomposition of organic matter;
soil subsidence;
reduced irrigation efficiency;
increased risk of drought. excessive leaching of valuable nutrients from the soil;
downstream environmental damage by salty or otherwise polluted drainage water;
the presence of ditches, canals, and structures impending accessibility and interfering with other infrastructural elements of the land.
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3. Leadership and Management
4. Planning Strategically
5. Communication
6. Solution Oriented
7. Time Management
8. Negotiation Skills
9. Project Handling & Management
10. Creativity
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It also contains Disaster management techniques, Risk mapping, Vulnerability Analysis, Role of NGOs in Disaster Mitigation and Management.
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Talking about the steps taken by the Government to improve Road Safety. Discussing on various safety recommendations.
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The family offers a choice of engines
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Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
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Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
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It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
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2. DEFINITION
When the conditions are so created that the
crop root-zone gets deprived of proper
aeration due to the presence of excessive
moisture or water content, the tract is said
to be Waterlogged.
To create such conditions it is not always
necessary that under ground water table
should enter the crop root-zone. Sometimes
even if water table is below the root-zone
depth the capillary water zone may extent in
the root-zone depth and makes the air
3. Groundwater:
Groundwater is the underground water
which occurs in the saturated zone of
earth surface.
Cracks and pores in existing rocks makes
this ground water reservoir.
Ground water utilized through wells and
tube wells.
4. Interference among wells:
When two or more wells are constructed
near to each other and their cones of
depression interact they are said to be
interfere.
Due to interference of wells discharge gets
decreases among these well.
5. Causes of waterlogging
1) OVER AND INTENSIVE IRRIGATION
Policy of intensive irrigation increases
water table.
To avoid this policy of extensive irrigation
should be used
.
2) SEEPAGE OF WATER FROM
ADJOINING HIGH LANDS:
Water from adjoining high lands may seep
6. 3) SEEPAGE OF WATER THROUGH
CANALS:
water may seep through beds and sides of
canals, reservoirs etc. which increase water
table.
4) IMPERVIOUS OBSTRUCTION:
Due to impervious strata water table rises
from upstream side.
5) INADEQUATE MATURAL DRAINAGE:
Soil having less permeable substratum
below pervious soil will not able to drain
water deep into ground causes high water
7. 6) INADEQUATE SURFACE DRAINAGE:
If proper drainage is not provided then
the storm water constantly percolates and
rise level of water table.
7) EXCESSIVE RAIN:
Excessive rainfall may create temporary
water logging
8) IRREGULAR OR FLAT TOPOGRAPHY :
In steep terrain water is drained quickly
but in flat terrain drainage is poor which
raise water table.
8. EFFECT OF WATER LOGGING:
Normal cultivation operations can not be
carried out easily in wet soil.
Free water may rise above the surface of
the land, making cultivation operation
impossible
Certain water loving plants like grasses,
weeds etc grow fastly in water logged land
and affects the growth of the crops.
Water logging also leads salinity.
9. The presence of excessive moisture
content lowers the temperature of the soil.
In low temperature the bacteriological
activities are retarded which affects the
crop growth badly.
Untimely maturity of the crops is the
characteristic of waterlogged lands. Due to
this shortening of crop period the crop
yield is reduced considerably.
Creation of anaerobic condition in the
crop root-zone.
The upward water movement brings the
10. REMEDIAL MEASURE OF
WATERLOGGING:
1). Lining of canals and water course:
lining of canals reduces seepages of water.
2). Reducing the intensity of irrigation :
in area where there is possibility of water
logging,
intensity of irrigation should be reduced.
3). By introducing crop rotation:
certain crops require more water and
others requires
less water so by rotation of crops avoid
11. 4). Optimum use of water:
Certain fixed amount of irrigation gives
best results. less than and more than that
reduces yield.
5). Providing intercepting drains:
Intercepting drains along canals should
be provided which prevent seeping canal
water from reaching the water logged
area.
6). Provision of efficient drainage system:
A good drainage system provided for
drain storm water.
12. 7). Improving natural drainage of area:
to reduce percolation of water the water
should not be stand for longer period.
8). Introducing to lift irrigation:
it helps in lowering the water table
through tube wells.
9). Implementation of drainage schemes
Waterlogged areas may be reclaimed by
introducing overland and underground
drainage schemes.
13. LAND DRAINAGE :
In irrigated area two types of drainage can
be provided:
SURFACE DRAINAGE:
• Surface drainage is the removal of excess
water by using and construction open
ditches, field drains, land grading, and
relative structures.
• Open drains which used to remove water
from excess irrigated area and storm
water are broad and shallow called
shallow surface drains.
14. • It carry runoff to outlet drains which large
enough to carry flood water these drains
called deep surface drains.
• Land grading includes continuous land
slope towards field drains.
• Shallow surface drains are trapezoidal in
cross section and constructed to carry
normal storm water.
• Deep surface drains are constructed to
carry storm water plus excess irrigated
water from tile drains .
18. SUB-SURFACE DRAINAGE OR
TILE DRAINAGE:
• Subsurface drains are required for soils
with poor internal drainage and high
water table.
Construction of subsurface drainage is
given below:
1) ENVELOPE FILTER:
• Tile drains are pipe drains and made up of
porous material circular in cross section.
• Diameter may vary from 10 to 30 cm.
• These drains laid below ground level and
connected with each other by open joints.
• The trenches are back filled with sand and
excavated material.
19.
20.
21. • The tile drains should not place below less
permeable strata.
• When it situated below les permeable
strata then they are surrounded by graded
gravels called ‘Envelope filters’.
• It prevent inflow of soil into drain and
increases effective tile diameter.
22. 2)Outlets for tile drains:
• Water from tile drain is discharged into
some bigger drains called surface drains.
• The water from tile drains may be
discharged by gravity or pumping.
a) Gravity outlets:
26. • GRID IRON
SYSTEM:
In this system
laterals are
provided only
on one side of
main. It is
adopted when
land is
practically level.
27. • HERRING BONE
SYSTEM:
in this system
laterals are joint
the main from
each side
alternatively. It is
adopted when
main is laid
depression.
28. • DOUBLE MAIN
SYSTEM:
it has two
mains with
separate laterals
for each main. It
is adopted when
bottom of
depression is
wide.
29. • INTERCEPTING
TILE DRAINS:
In this system there
is no laterals drains.
A main is provided
at toe of slope. It is
adopted when main
source of drainage
is from hilly land.