الفهرس 
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Abstract
The experimental work was carried out during the period from September 2021 to April 2022 at a private farm in Wadi El-Natrun center, Beheira Governorate, Egypt, located at 31˚ 30ʹ 35ʹʹ E longitude and 29˚ 52ʹ 31ʹʹ N latitude and mean altitude 6.7 m above sea level to present the general methodologies and tools used for this study to evaluate the performance of modified screen filter. Irrigated agriculture is the biggest consumer of water in the world. In areas with dry climates, crop irrigation requires from 70 to 85 % of total water use. Clogging of emitter is a major concern in drip irrigation system because high levels of suspended solids, nutrients (N and P especially) and organic matter entreat fish water effluent, the cause of clogging can be divided into three man categories (1) physical, suspended solids; (2) chemical, caused by precipitation reactions; and (3) biological, caused by growth and metabolism of microorganisms; i.e., biofilm formation, at the same time, increasing urbanization is producing large volumes of wastewater and fish drainage water that have become a serious environmental problem in most countries.