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A separator unit includes a tank defining an internal volume and having an inlet and an outlet. An insert separates the tank into an upper chamber and a lower chamber. The insert includes a weir at an upper side to define an intake area for receiving an influent liquid, a first opening in the intake

A separator unit includes a tank defining an internal volume and having an inlet and an outlet. An insert separates the tank into an upper chamber and a lower chamber. The insert includes a weir at an upper side to define an intake area for receiving an influent liquid, a first opening in the intake area for delivering liquid down into the lower chamber and a second opening on an opposite side of the weir for delivering liquid from the lower chamber back up into the upper chamber. The separator may include one or more of the first opening being of arcuate shape, a perforated shroud extending downward from the insert within the lower chamber and/or an upflow pipe extending downward from the second opening into the lower chamber, a bottom of the upflow pipe covered, and a slot opening in a sidewall of the upflow pipe.

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1. A separator unit, comprising: a tank defining an internal volume and having an inlet and an outlet;an insert within the tank and separating the tank into an upper chamber and a lower chamber, the insert including a weir at an upper side of the insert to define an intake area for receiving an infl

1. A separator unit, comprising: a tank defining an internal volume and having an inlet and an outlet;an insert within the tank and separating the tank into an upper chamber and a lower chamber, the insert including a weir at an upper side of the insert to define an intake area for receiving an influent liquid, a first opening through the insert in the intake area for delivering liquid down into the lower chamber and a second opening through the insert on an opposite side of the weir for delivering liquid from the lower chamber back up into the upper chamber;wherein the first opening is of arcuate shape;an upflow pipe extending downward from the second opening into the lower chamber, a bottom of the upflow pipe covered, and a slot opening in a sidewall of the upflow pipe. 2. The separator of claim 1 wherein first opening has an outer arc formed by a portion of a wall of the tank and an inner arc formed by a downwardly extending arcuate panel of the insert. 3. The separator of claim 2 wherein a circumferential extent of the outer arc and a circumferential extent of the inner arc are substantially the same. 4. The separator of claim 3 wherein each circumferential extent is between about 30° to about 150°. 5. The separator of claim 3 wherein each circumferential extent is between about 80° to about 100°. 6. The separator of claim 1 wherein the first opening includes an outer arc, an inner arc formed by a downwardly extending arcuate panel of the insert, and substantially planar sides formed by first and second opposed and downwardly extending substantially planar panels of the insert that adjoin the arcuate panel. 7. The separator of claim 6 wherein a radial width of the first opening is between about 25% and 50% of an inside radius of the tank. 8. The separator of claim 1 wherein the tank inlet is a sidewall inlet, the first opening is located below the sidewall inlet, a central portion of the arcuate shape of the first opening is positioned below the sidewall inlet, a first end portion of the arcuate shape is positioned to a first side of the sidewall inlet, and a second end portion of the arcuate shape is positioned to a second side of the sidewall inlet. 9. The separator of claim 1 wherein a grate member overlies at least part of the first opening. 10. The separator of claim 9 wherein the grate member is mounted for pivotal movement between a lowered position that overlies the first opening and a raised position. 11. The separator of claim 9 wherein the tank inlet is a sidewall inlet, the first opening is located below the sidewall inlet, and the grate member overlies the first opening in a region below the sidewall inlet. 12. The separator of claim 1, further comprising a perforated member extending downwardly from the insert into the lower chamber, the perforated member having a lower end that is higher than a bottom of the tank. 13. The separator of claim 12 wherein the perforated member is a rigid, non-movable member. 14. The separator of claim 12 wherein the perforated member comprises a flexible material and is mounted to permit some movement under flow conditions through the lower chamber. 15. The separator of claim 14 wherein the flexible material has stiffening rods, stiffening springs or weights, or any combination of stiffening rods, stiffening springs or weights, sewn into vertical edges of the flexible material. 16. The separator of claim 14 wherein the flexible material comprises a 3-dimensional geotextile material. 17. The separator of claim 12 wherein perforated member is of substantially a V-shape in top plan view, with a point of the V-shape located proximate the first opening. 18. The separator of claim 1 wherein the second opening includes an orifice plate with a rectangular flow control opening. 19. The separator of claim 1 wherein the slot opening spans no more than one half of a circumference of the upflow pipe, where a circumferential midpoint of the slot opening faces the tank wall at a point 180° from a midpoint of the arc-shaped first opening. 20. The separator of claim 1, further comprising: wherein the first opening includes an outer arc, an inner arc formed by a downwardly extending arcuate panel of the insert, and substantially planar sides formed by first and second opposed and downwardly extending substantially planar panels of the insert that adjoin the arcuate panel;a perforated member extending downwardly from the insert into the lower chamber, the perforated member having a lower end that is higher than a bottom of the tank, the perforated member including a central portion positioned toward the first opening and end portions positioned away from the first opening; andthe slot opening facing away from a location of the first opening such that liquid traveling from the first opening to the second opening enters the upflow pipe in a direction that is in part laterally back toward the first opening;wherein the perforated member is located between the first opening and the second opening such that some liquid entering the lower chamber so as to intercept flow from the first opening to the second opening thereby spreading the flow and attenuating stream velocities. 21. The separator of claim 1, wherein the arcuate shape of the first opening defines a segment of an annulus. 22. The separator of claim 1, further comprising: the upflow pipe having an upper flange resting atop the insert;an orifice plate with a flow control opening overlies the second opening and at least part of the flange of the upflow pipe to lock the upflow pipe in place against upward flows. 23. A separator unit, comprising: a tank defining an internal volume and having an inlet and an outlet;an insert within the tank and separating the tank into an upper chamber and a lower chamber, the insert including a weir at an upper side of the insert to define an intake area for receiving an influent liquid, a first opening through the insert in the intake area for delivering liquid down into the lower chamber and a second opening through the insert on an opposite side of the weir for delivering liquid from the lower chamber back up into the upper chamber;a perforated shroud extending downward from the insert within the lower chamber and having a lower end positioned above a bottom of the lower chamber, wherein at least some liquid passes through the perforated shroud as such liquid flows through the lower chamber in order to reach the second opening;wherein the perforated member includes a central portion positioned toward the first opening and end portions positioned away from the first opening;wherein the perforated member comprises a flexible material and is mounted to permit some movement under flow conditions through the lower chamber;wherein the perforated member is located between the first opening and the second opening such that some liquid entering the lower chamber so as to intercept flow from the first opening to the second opening thereby spreading the flow and attenuating stream velocities; andan upflow pipe extending downward from the second opening into the lower chamber, a bottom of the upflow pipe closed, and at least one opening in a sidewall of the upflow pipe, the opening of the upflow pipe facing away from a location of the first opening such that liquid traveling from the first opening to the second opening enters the upflow pipe in a direction that is in part laterally back toward the first opening. 24. A separator unit, comprising: a tank defining an internal volume and having an inlet and an outlet;an insert within the tank and separating the tank into an upper chamber and a lower chamber, the insert including a weir at an upper side of the insert to define an intake area for receiving an influent liquid, a first opening through the insert in the intake area for delivering liquid down into the lower chamber and a second opening through the insert on an opposite side of the weir for delivering liquid from the lower chamber back up into the upper chamber;an upflow pipe extending downward from the second opening, a bottom of the upflow pipe closed, the upflow pipe includes a tubular wall with a first side facing toward the first opening and a second side facing away from the first opening, wherein the first side is a solid wall configuration and the second side includes at least one opening for permitting liquid to enter the rise pipe to flow up to the second opening. 25. The separator of claim 24 where the second side of the tubular wall includes a slot opening, the slot opening extending through no more than one-hundred eighty degrees. 26. The separator of claim 25 wherein the slot opening has a lower edge at the bottom of the upflow pipe an upper edge positioned below an underside of the insert, with a slot height of no more than thirty-five percent of a radius of the tank. 27. The separator of claim 26 wherein the slot height is substantially equal to twenty-five percent of the radius of the tank. 28. The separator of claim 24, further comprising on or more of: a perforated shroud extending downward from the insert within the lower chamber and having a lower end positioned above a bottom of the lower chamber, wherein at least some liquid passes through the perforated shroud as such liquid flows through the lower chamber in order to reach the second opening and/or at least one perforated member positioned substantially horizontally in one or more of the lower chamber, atop the drop chute and/or within a vertical extent of the drop chute.