Volume 20, Issue 53, January - June, 2023

Determination of design parameters for irrigation water abstraction and supply system: A case study

Uche UE¹, Iwuoha LI¹, Aserifa WE²

¹Department of Mechanical Engineering, Air Force Institute of Technology, Kaduna, Nigeria
²Department of Aerospace Engineering, Air Force Institute of Technology, Kaduna, Nigeria

ABSTRACT

A selection design process is implemented to determine irrigation water abstraction and supply system for a rice paddy farm. Alternatives are considered based on the result of rigorous engineering survey and analysis on-source of water, the abstraction method, the pump type, model and capacity, plant installation & operation and the supply of water and pipe size. Designing at 85% conveyance efficiency, 10 mm/day plot deep percolation and 12hr per day pumping, for a basin irrigation requiring soil water saturation depth of 11.825 cm and flood water of 10 cm, 185 m³/hr. pump discharge capacity is obtained. To select a pump model to deliver the required flowrate, pump matching, involving the development of the system characteristics curve equation and its super-imposition on available pump characteristics curve is deployed to choose NCG43 model running at 1450 rpm, a discharge of 185 m³/hr. and a total dynamic head of 12.5m to meet the irrigation water demand. Further, electric motors and internal combustion engines as well as centrifugal pump and turbine pumps were considered. A multi-power source centrifugal pump that allows the use of electricity, diesel or petrol power unit is recommended. Finally, the minimum diameter of the pipe required to deliver 0.05 m³/s of water to the largest rotational area of 4.58 ha was determined as 0.21m. A pipe diameter of 25 cm is considered adequate for the water delivery route. The same size is selected for the suction hose to ensure uniformity of installation work as well as reduce operational head losses in the pipe.

Keywords: Conveyance efficiency, pump matching, internal combustion engines, deep percolation

Indian Journal of Engineering, 2023, 20(53), e9ije1009

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DOI: https://doi.org/10.54905/disssi/v20i53/e9ije1009

Published: 17 March 2023