inner wall 44 of gutter 20 it should be mentioned that mounting plate 58 includes a plurality of spaced slots 60 that form inlets for the passage of water from the pool to control passage 54 and a plurality of mounting holes 62 for receiving threaded fasteners 63 that are screwed into aligned threaded holes 64 in gutter inner wall 44 with continued reference to fig2 and 4 each of the gutter flow controllers 40 40 e includes a control passage outlet 70 that is normally covered by a hydrostatic gate indicated generally at 72 as seen in fig2 and 4 hydrostatic gate 72 is moveably mounted on rear wall 48 of the controller by means of threaded fasteners 74 provided at each end of gate 72 each of the fasteners 74 extends freely through a respective compression spring 76 and hole 78 and then into threaded engagement with a respective threaded hole 80 provided in rear wall 48 of the controller it will be understood that hydrostatic gate 72 which includes an inner gate surface 82 and an outer gate surface 84 is biased towards a position wherein it throttles control passage outlet 70 by means of the spring forces exerted by springs 76 it will further be understood that the bias exerted by springs 76 on gate 72 can be established and increased and decreased in magnitude by adjusting threaded fasteners 74 inwardly and outwardly with respect to threaded holes 80 in operation the gutter flow controllers 40 through 40 e are as one of their functions adapted to establish and maintain flow gradients for a quiescent condition flow along the channel 86 of gutter system 20 such quiescent condition flow is.