Variable gradient complete open channel side channel

摘要

(57) Abstract Topic In the level area whose capacity is little relatively earth''s surface gradient and the flowing waterGradient those which differ or being cheap when we would like to make converse gradient, beautyTo be superior even impression, maintenance the U letter die side channel for easy guttationIt offers. Solutions On cartridge head of U letter die side channel slow for variable gradientIt has pudorein.