ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Water distribution, discharge-pressure relation and rotation nonuniformity of pop-up sprinklers during application of reclaimed sewage effluent and groundwater were tested to investigate the effects of water quality on sprinkler performance. The overlapped sprinkler uniformity coefficients were also determined from the radial water distribution of an individual sprinkler. Three types of pop-up sprinklers, DPX-HP sprinkler, DPX-TS sprinkler (recordable angle adjusting) and Toro V-1550 sprinkler, were used and sprinkler performance were measured after the operation of 447h for both sewage effluent and groundwater application. A significant influence of water quality on sprinkler performance was found. Sewage effluent application resulted in 3.4%~4.7% and 2.7%~9.0% reduction in sprinkler discharge and coverage radius, respectively; while sprinklers applying groundwater produced a 0.03%~0.09% reduction in discharge and a 2.5%~3.9% reduction in radius. Sprinkler rotation nonuniformity, represented by a maximum rotation deviation, increased after a continuously operation of 447h, but no significant influence of water quality on the rotation nonuniformity was observed. The influence of water quality on Christiansen uniformity coefficient (CU) was also insignificant.