Abstract
Rainfall in DeduruOya basin has a significant temporal variation and thus the Deduru Oya carry flash floods during rainy season and very low flows during dry season. The Deduru Oya reservoir under construction at the upstream of the existing Ridi Bedi Ela anicut will be useful to regulate discharge of the DeduruOya for better utilizing the basin water resources especially for irrigation. The multi-purpose DeduruOya reservoir project with a reservoir of a capacity of 75 Million Cubic Meters (MCM), augments water resources in 136 existing tank based irrigation systems in the Deduru Oya Left Bank through a Left Bank (LB) canal and also diverts water to the Iginimitiya tank in the Mee Oya basin through a Right Bank (RB) trans basin canal. This study develops a model for water management in LB canal development area and for the assessment of diversion requirement from the Deduru Oya reservoir through the LB Canal to supplement LB irrigation demand. Hydrological Engineering Center-Hydrological Modeling System (HEC-HMS) is used for runoff estimations and CROPWAT model is used to estimate crop water requirements. Water Evaluation And Planning (WEAP) model is used for water balance simulations in Deduru Oya LB canal development area and to calculate water requirements from LB canal for the period of recent 10years. The study reveals that the annual water requirement from the LB canal for 100% cropping intensity in the proposed 3000 ha irrigable area in LB canal development area varies from 26 MCM to 41 MCM. ENGINEER, Vol. 47, No. 04, pp. 17-32, 2014
Highlights
With the increase of population, demand for food increases and areas under irrigated agriculture continue to increase all over the world [4]
This paper describes the water balance study of the irrigation tanks augmented by the LB canal
Inflows to the irrigation tanks in LB development area are not available and a rainfall - runoff model was developed to estimate the direct inflows to the tanks from their own catchments
Summary
With the increase of population, demand for food increases and areas under irrigated agriculture continue to increase all over the world [4]. As the supply of water for all needs is only through the dynamics of hydrologic cycle, careful management of the limited water resources under increasing demand of water for irrigation and other multiple uses isutmost important.Extreme climate changes that are evident in the world seriously affect water sources and hydrologic cycle [17]. Area of cultivation has been increased to the maximum in modern irrigation systemsin order to maximize the agriculturalproduction under given water source.changes in climatic patterns frequently have caused a reduction in seasonal water availability and affect the cultivation [8]. Seasonal water shortages in drought years seriously affect the cultivations under modern major irrigation schemes [17].Failure to manage the water sources in an effective manner which leads to the reduction of irrigated agriculture will affect the society and the economy of the country [8]. Irrigated agricultural systems need to be resilient to such effects in order to avoid crop failures
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