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Allocation of scarce water resources using deficit irrigation in rotational systems
journal contribution
posted on 2008-09-08, 11:26 authored by S.D. Gorantiwar, Ian K. SmoutOn irrigation schemes with rotational irrigation systems in semiarid tropics,
the existing rules for water allocation are based on applying a fixed depth of water with every
irrigation irrespective of the crops, their growth stages and soils on which these crops are
grown. However when water resources are scarce, it is necessary to allocate water optimally
to different crops grown in the irrigation scheme taking account of different soils in the
command area. Allocating water optimally may lead to applying less water to crops than is
needed to obtain the maximum yield. In this paper, a three stage approach is proposed for
allocating water from a reservoir optimally based on a deficit irrigation approach, using a
simulation-optimization model. The allocation results with a deficit irrigation approach are
compared for a single crop (wheat) in an irrigation scheme in India, firstly with full irrigation
(irrigation to fill the root zone to field capacity) and secondly with the existing rule. The full
irrigation with a small irrigation interval was equivalent to adequate irrigation (no stress to
the crop). It is found that practising deficit irrigation enables the irrigated area and the total
crop production in the irrigation scheme used for the case study to be increased by about 30-
45% and 20-40%, respectively over the existing rule and by 50% and 45%, respectively over
the adequate irrigation. Allocation of resources also varied with soil types.
History
School
- Architecture, Building and Civil Engineering
Research Unit
- Water, Engineering and Development Centre (WEDC)
Citation
GORANTIWAR, S.D. and SMOUT, I.K. 2003. Allocation of scarce water resources using deficit irrigation in rotational systems. Journal of Irrigation and Drainage Engineering, 129 (3), pp. 155-163 [DOI 10.1061/(ASCE)0733-9437(2003)129:3(155)]Publisher
© American Society of Civil Engineers (ASCE)Publication date
2003Notes
This journal article was published in the journal, Journal of Irrigation and Drainage Engineering [© ASCE]. The definitive version is available at: http://cedb.asce.orgISSN
0733-9437Language
- en
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