A large Hydrogeochemical data were obtained from the central Nile delta aquifer system where 167 groundwater samples were gathered from three depth zones and analyzed for majors and minors. Different statistical techniques were applied to the analyzed geochemical data. The target of the current investigation is to find the principle factors and processes controlling the variation in the hydrogeochemistry in the three groundwater zones. The physicochemical analysis revealed that concentrations of majors (K, Na, Ca, Mg, HCO₃, Cl and SO₄) with some traces as NO₃, Si, NH₄ and Fe decrease from the shallow zone to reach its lowest values in the deep zone because of the surface hydrologic and anthropogenic factors affect the shallow groundwater. The studied groundwater classified into five series, every series has its own hydrochemical type. It is revealed that the shallow groundwater was affected by surface hydrochemical process, soil salinity and water–rock interaction as main sources of groundwater salinity. There are two origins of the deep groundwater, one is fresh flowing from south to north and the other is influenced by the intruded seawater in the northern part of the investigated region. The groundwater of the intermediate zone is a mix between the shallow groundwater and the deep groundwater.

从尼罗河三角洲中部含水层系统中获得了大量水文地球化学数据，其中从三个深度区域收集了 167 个地下水样本，并分析了主要和次要。不同的统计技术被应用于分析的地球化学数据。当前调查的目标是找出控制三个地下水区水文地球化学变化的主要因素和过程。理化分析表明，主要元素（K、Na、Ca、Mg、HCO ₃、Cl 和 SO ₄）的浓度以及一些痕量的 NO ₃、Si、NH ₄由于地表水文和人为因素影响浅层地下水，Fe从浅层减少到深层最低值。研究的地下水分为五个系列，每个系列都有自己的水化学类型。结果表明，浅层地下水受地表水化学过程、土壤盐分和水岩相互作用的影响是地下水盐分的主要来源。深层地下水有两种来源，一是自南向北的淡水，二是受调查区北部侵入海水的影响。中间带地下水是浅层地下水和深层地下水的混合体。