the c clip is secured to a flushing fountain 30 comprising a square section conduit 31 having a substantially flat top surface 32 longitudinally along the top surface midline is an upstanding blade or fluid barrier 33 secured to the surface as by welding on both sides of the blade 33 between the respective vertical faces of the blade and the corresponding top surface edge 34 a series of fountain holes 36 i and 37 communicate the interior of conduit 31 with the exterior elements of top surface 32 bore axes of the holes are alternated between a vertical or 0 u00b0 orientation for holes 36 to some angle between 10 u00b0 and 45 u00b0 for holes 37 the fig2 and 4 illustrated angle of 30 u00b0 is merely representative the axis angle for holes 37 is turned away from the center blade 33 and toward the weir edge 34 respective to both rows of holes representative dimensioning for the fountain holes 36 and 37 may include a ratio of about 25 wherein the hole diameter is 20 of the hole spacing period for example a periodic distance of 174 inch between holes 36 and 37 would suggest a hole diameter of 1 16 inch the screen edge cupping rail assembly 40 comprises the rail.