Post on 19-Feb-2022
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CONSUMPTIVE USE Quantity of water require by plant to meet to meet it’s
evapouration-transpiration & to meet metabolic activities .
C.U = E +T +𝑊𝑚
>99% <1%
~ E+T C.U =consumptive use
𝑊𝑚=Water require for metabolic process
E= evapouration
T=evapouration13
CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL
Necessity of Consumptive use of water
Plane the crop pattern for a particular locality depending upon
availability of water .
Require to design a irrigation project .
Require to determine the quantity of water to be released from
reservoir or irrigation project .
In kharif season CU is less as compered to rabi season .
14CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL
Factor affecting consumptive use
Climatic
Crop
Soil
Management
CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL
:1 . CLIMATIC FACTOR
a) Radiation
b) Temperature
c) Humidity
d) Wind velocity
e) Rainfall
CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL
CROP FACTOR
No. &size ofstomata
Opening &closing of stomata
Plant architecture &planting pattern
Stages ofgrowth
Rooting depth&pattern
Duration of thecrop
CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL
SOILFACTOR
Water holdingcapacity
Soil waterdepthInfiltrationrate
CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL
MANAGEMENT FACTOR
Time ofsowing
MulchingFertilizerapplication
CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL
CONSUMPTIVE USE EXPRESSEDAS
Daily consumptive use: Total amount of 𝐻2O used in ET & metabolic
activities by crop during a single day .
Expressed in – mm/day or cm/day
Seasonal consumptive use: Total amount of 𝐻2O used in ET &
metabolic activities by crop during it’s total growing season .
Expressed in- mm/season or cm/season
Peak period of consumptive use :The average daily 𝐻2O use rate
in term of ET & metabolic activities during highest CU period
of season .
CE8603 – IRRIGATION ENGINEERING/V.PRIYA/AP/CIVIL