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The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
The Blaney–Criddle equation is a relatively simplistic method for calculating evapotranspiration.When sufficient meteorological data is available the Penman–Monteith equation is usually preferred.
Li Bing (Chinese: 李冰; pinyin: Lǐ Bīng; c. 3rd century BC) was a Chinese hydraulic engineer and politician of the Warring States period. He served the state of Qin as an administrator and is revered for his work on the Dujiangyan River Control System , which both controlled flooding and provided irrigation water year-round, greatly ...
The sodium adsorption ratio (SAR) is an irrigation water quality parameter used in the management of sodium-affected soils.It is an indicator of the suitability of water for use in agricultural irrigation, as determined from the concentrations of the main alkaline and earth alkaline cations present in the water.
The first MPR nozzles, the MP Rotator, were produced by Nelson Irrigation in 2003, and acquired by Hunter Industries in 2007. [4] [5] [6] Since then the popularity of these highly uniform yet low application sprinklers has caused every major sprinkler manufacturer to produce their own version of an MPR sprinkler, including Rain Bird [7] and Toro.
The top is an original from the late 5th century BC. The bottom is a reconstruction of a clay original. A water clock or clepsydra (from Ancient Greek κλεψύδρα ( klepsúdra ) ' pipette , water clock'; from κλέπτω ( kléptō ) 'to steal' and ὕδωρ ( hydor ) 'water'; lit.
The RSC index is used to find the suitability of the water for irrigation in clay soils which have a high cation exchange capacity. When dissolved sodium in comparison with dissolved calcium and magnesium is high in water, clay soil swells or undergoes dispersion which drastically reduces its infiltration capacity .
Before 3000 BC – Civilization starts by settling around rivers, coast and lakes. 3000 BC – Irrigation techniques develop in Mesopotamia and Ancient Egypt. [1] Indus Valley Civilisation develops city-wide drainage systems and toilet systems. [1] Egyptians develop reed boats. 2300 BC – Construction of the Nahrawan Canal. [1]
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