Abstract:
Devices, apparatus, systems and methods for preventing backflow current problems which often have caused debris and litter to pass out of screen type baskets used in storm water treatment systems. A half size or full size pivoting panel at the input end of a basket screen system placed in a storm water treatment chamber can downwardly divert incoming storm water so as to prevent back flow currents from being formed. The pivoting panel can work well during high flow conditions. A half size or full size pylon located in the input end of the basket screen can split and divert incoming storm water to also prevent back flow currents from also being formed. The pylon can work well during low flow conditions. Also, both the half pivoting panel and the half pylon can both be used at the input end of the screen basket. Still furthermore a gap in the floor before the input end of the screen basket can allow for sediment coming to pass down and collect beneath the screen basket.

Description:
This invention claims the benefit of priority to U.S. Provisional Application Ser. No. 61/364,972 filed Jul. 16, 2010. 
    
    
     FIELD OF INVENTION 
     This invention relates to storm water treatment systems, and in particular to devices, apparatus, systems and methods for preventing backflow current problems that causes debris to overflow a storm water treatment system by utilizing a pivoting panel and/or pylon, along with an optional inflow sediment collection gap. 
     BACKGROUND AND PRIOR ART 
     Baskets and screen type systems are sometimes placed in storm water vaults in order to capture floating debris such as leaves and litter, and the like. However these screen systems can sometimes become obstructed by debris and not allow for much water to pass therethrough. When the flows are high and these screen systems can become obstructed, previously captured floatables can escape. For example, a backflow current problem can occur which can cause floating debris to be forced out of a screen system and into the vault and beyond. The backflow current problem can occur when the water flowing current within a screen system starts to flow in the opposite direction to the current flow entering into the screen system. The backflow current problem can cause a screen system to empty out of the screen system any previously captured floating debris and litter. As such, the backflow current problem can result in preventing any further collection of floating debris and litter. 
       FIG. 1  is a top perspective view of prior art baffle box with storm water and floatables  40  flowing through the screen system  10 .  FIG. 2  is another top perspective view of the prior art baffle box  20  of  FIG. 1  with a backed up screen system  10 . Referring to  FIGS. 1-2 , a screen system  10  includes a baffle box  20  that is intended to remove floatables from the incoming storm water  100  that has floatables  30 , such as debris, and litter, mixed in with storm water having debris  40 . The storm water with debris  40  passes through inflow pipe  50 , where the storm water  60  carry&#39;s floatables into the screen system  10 , where the floatables  70  filtered by the screen system  10  are accumulated for later removal. The filtered storm water  80  flows out from the outflow pipe  90  of the system  10 . Storm water flow  100  into the screen system  10  is diminished by the backup of floatables  30  into the system  10 . 
     Referring to  FIGS. 1-2 , storm water flow into screen system diminished by backup  100  of floatables in the system  10 . The incoming storm water  40  encounters the backup of floatables  100  where turbulence  130  in the screen system  10  agitates previously captured floatables  70  which can flow up and backwards  110  toward the front of the screen system  10 . The backflow  120  from the screen system  10  then flows around the sides of the system  10  towards the outflow pipe  90  carrying previously captured floatables  160  out of the baffle box  20 . Storm water outflow  150  from the baffle box&#39;s  20  then carry&#39;s previously captured floatables out of the system  10 . The screen system  10  becomes compromised  140  by the backup  100 / 250  of floatables in the system  10 . 
     Referring to  FIGS. 1-2 , most of the storm water will not flow through the screen system  10 . Turbulence caused by storm water flowing into the backed up screen system  10  agitates the previously collected floatables  160  causing them to escape from the screen system  10  and flow out of the box  20 . 
     Thus, the need exists for solutions to the above problems with the prior art. 
     SUMMARY OF THE INVENTION 
     A primary objective of the present invention is to provide devices, apparatus, systems and methods for improving the removal efficiency of screen systems in storm water vaults, and the like, by preventing the formation of a backflow current problem within the screen system. 
     A secondary objective of the present invention is to provide devices, apparatus, systems and methods for improving storm water screen systems to accumulate floating debris, litter and the like, without losing previously captured debris. 
     A third objective of the present invention is to provide devices, apparatus, systems and methods for improving storm water screen systems by using half pivot panels. 
     A fourth objective of the present invention is to provide devices, apparatus, systems and methods for improving storm water screen systems by using full pivot panels. 
     A fifth objective of the present invention is to provide devices, apparatus, systems and methods for improving storm water screen systems by using half pylons. 
     A sixth objective of the present invention is to provide devices, apparatus, systems and methods for improving storm water screen systems by using full pylons. 
     A seventh objective of the present invention is to provide devices, apparatus, systems and methods for improving storm water screen systems by using a combination of half pylons and half pivot panels. 
     A version of the improved screen system for preventing backflow currents during storm water treatments, can include a screen housing for being placed in a storm water treatment environment, the housing having an input end and an output end, and a backflow current preventer at the input end of the screen housing, wherein the backflow current preventer stops debris for passing out of the screen system when incoming storm water is flowing through the screen system. 
     The backflow preventer can be a pivoting panel at the input end of the screen housing for diverting the incoming storm water downward through the screen system. The pivoting panel can be sloped at an angle to the incoming storm water flowing through the screen system. Sloping the panel can enhance floatables to be directed downward and moving into the body of the screen system. The panel can be solid. The panel can be perforated. The panel can be rigid. Alternatively, the panel can be flexible. 
     The pivoting panel can be substantially vertically oriented substantially perpendicular to the incoming storm water flowing through the screen system. A hinge can attach a top portion of the panel to the screen system. 
     A gap or opening can be located adjacent to the inflow on the bottom of the screen system for allowing sediment from incoming storm water to drop beneath the screen system. 
     The pivoting panel can be a half panel that is pivotally attached to a ceiling of the screen system and having a bottom end substantially half way between a floor and the ceiling of the screen system. 
     The pivoting panel can be a full size panel that is pivotally attached to a ceiling of the screen system and having a bottom end substantially adjacent to a floor of the screen system. 
     The backflow current preventer can be a pylon at the input end of the screen housing for diverting the incoming storm water to horizontally split to left and right sides inside of the screen system. 
     The pylon can have a flat face on a side facing the incoming storm water. 
     The pylon can have a rounded face on a side facing the incoming storm water. 
     The pylon can have a triangular shaped face on a side facing the incoming water. 
     A gap or opening can be located adjacent to the inflow on the bottom of the screen system for allowing sediment from incoming storm water to drop beneath the screen system. 
     The pylon can be a half size pylon having a bottom end adjacent to a floor of the screen system. The pylon can be a full size pylon that runs between a floor and ceiling of the screen system. 
     The backflow preventer can include both a pivoting panel at the input end of the screen housing for diverting the incoming storm water downward through the screen system, and a pylon at the input end of the screen housing for diverting the incoming storm water to horizontally split to left and right sides inside of the screen system. 
     A gap or opening can be located adjacent to the inflow on the bottom of the screen system for allowing sediment from incoming storm water to drop beneath the screen system. 
     Another version of the storm water screen system with pivotable gate for preventing backflow currents during storm water treatments can include a screen housing for being placed in a storm water treatment environment, the housing having an input end and an output end, and a pivoting panel at the input end of the screen housing for downwardly diverting the incoming storm water downward through the screen system to prevent back flow current which stops debris from passing out of the screen system when incoming storm water is flowing through the screen system. 
     A hinge can attach a top portion of the panel to the screen system. 
     A gap can be located in front of the screen system for allowing sediment from incoming storm water to drop beneath the screen system. 
     Another version of the storm water screen system with pylon diverter for preventing backflow currents during storm water treatments, can include a screen housing for being placed in a storm water treatment environment, the housing having an input end and an output end, and a pylon at the input end of the screen housing for splitting the incoming storm water through the screen system to prevent backflow current which stops debris from passing out of the screen system when the incoming storm water is flowing through the screen system. 
     The pylon diverter can have a flat face on a side facing the incoming storm water. 
     The pylon diverter can be a nonflat flat face facing the incoming storm water. 
     A gap can be located in front of the screen system for allowing sediment from incoming storm water to drop beneath the screen system. 
     A method for preventing backflow currents in storm water treatment systems, can include the steps of positioning a screen housing in a storm water treatment environment, the housing having an input end and an output end, flowing incoming storm water with debris into the input end of the screen housing, preventing backflow current from occurring in the screen housing, and stopping debris from passing out of the output end of the screen system when the incoming storm water is flowing through the screen system. 
     The preventing step can include the step of downwardly diverting the incoming storm water entering into the input end of the screen housing. The downwardly diverting step can include the step of providing a pivotable panel for downwardly diverting the incoming storm water entering into the input end of the screen housing. 
     The method can further include the step of collecting sediment from the incoming storm water through a gap or opening adjacent to the inflow on the bottom of the input end of the screen housing. 
     The preventing step can include the step of splitting the incoming storm water entering into the input end of the screen housing. The splitting step can include the step of providing a pylon for splitting the incoming storm water entering the screen housing. 
     The method can include the step of collecting sediment from the incoming storm water through a gap in front of the input end of the screen housing. 
     The preventing step can include the steps of downwardly diverting the incoming storm water entering into the input end of the screen housing, and splitting the incoming storm water entering into the input end of the screen housing. 
     The preventing step can include the steps of providing a pivotable panel for downwardly diverting the incoming storm water entering into the input end of the screen housing, and providing a pylon for splitting the incoming storm water entering into the input end of the screen housing. 
     The method can include the step of collecting sediment from the incoming storm water through a gap in front of the input end of the screen housing. 
     Further objects and advantages of this invention will be apparent from the following detailed description of the presently preferred embodiments which are illustrated schematically in the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG. 1  is a top perspective view of prior art baffle box with storm water and floatables flowing through the screen system. 
         FIG. 2  is another top perspective view of the prior art baffle box of  FIG. 1  with a backed up screen system. 
         FIG. 3  shows a top perspective view of a baffle box installed with a half pivot panel. 
         FIG. 4  is a cross-sectional side view of the baffle box with installed half pivot panel along arrows  4 X or  FIG. 3 . 
         FIG. 4A  is an enlarged view of the installed half pivot panel of  FIG. 4 . 
         FIG. 5  shows another top perspective view of the baffle box with installed half pivot panel of  FIG. 3  in a high flow condition. 
         FIG. 6  is a cross-sectional side view of the baffle box with installed half pivot panel of  FIG. 5  along arrow  6 X in a high flow condition. 
         FIG. 6A  is an enlarged view of the installed half pivot panel of  FIG. 6  in high flow condition. 
         FIG. 7  is a top front perspective view of a baffle box with a backed up screen system and an installed half pivot panel. 
         FIG. 8  is a cross-sectional side view of the baffle box with backed up screen system and installed half pivot panel of  FIG. 7  along arrow  8 X. 
         FIG. 9  is a top perspective view of baffle box installed with a full pivot panel. 
         FIG. 10  is a cross-sectional side view of the baffle box with installed full pivot panel of 
         FIG. 9  along arrow  10 X. 
         FIG. 10A  is an enlarged view of the installed full pivot panel of  FIG. 10 . 
         FIG. 11  is a cross-sectional side view of the baffle box with installed full pivot panel of  FIG. 9  in a high flow condition. 
         FIG. 11A  is an enlarged view of the installed full pivot panel of  FIG. 11  in a high flow condition. 
         FIG. 12  is a top perspective view of the baffle box with a full pivot panel installed with the screen system being obstructed by floatables. 
         FIG. 13  is a cross-sectional side view of the screen system of  FIG. 12  along arrow  13 X. 
         FIG. 14  is a top perspective view of a baffle box with a half pylon installed at the head of the screen system. 
         FIG. 15  is a top cross-sectional view of the baffle box with half pylon of  FIG. 14  along arrow  15 Y. 
         FIG. 16  is a top perspective view of the baffle box with half pylon installed and the screen system obstructed by previously collected floatables. 
         FIG. 17  is a top cross-sectional view of the baffle box with installed half pylon of  FIG. 16  along arrow  17 Y. 
         FIG. 18  is a top perspective view of a baffle box with full pylon installed at the head of the screen system. 
         FIG. 19  is a top cross-sectional view of baffle box installed with a fully pylon of  FIG. 18  along arrow  19 Y. 
         FIG. 20  is a top perspective view of the baffle box with installed full pylon of  FIG. 18  with screen system being obstructed by previously collected floatables. 
         FIG. 21  is a top cross-sectional view of the baffle box with installed full pylon of  FIG. 20  along arrow  21 Y. 
         FIG. 22  is a top perspective of baffle box with half pylon and half pivot panel installed. A low flow condition is shown and the pivot panel rests atop the pylon. 
         FIG. 23  is a cross-sectional side view of the baffle box with installed pylon and pivot panel of  FIG. 22  along arrow  23 X. 
         FIG. 24  is another cross-sectional side view of  FIG. 22  along arrow  23 X shown in a high flow condition. Increased water flow has raised the pivot panel. 
         FIG. 25  another cross-sectional side sectional view of  FIG. 22  along arrow  23 X with the screen system obstructed by previously collected floatables. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Before explaining the disclosed embodiments of the present invention in detail it is to be understood that the invention is not limited in its applications to the details of the particular arrangements shown since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not of limitation. A list of the components in the figures will now be described.
       10 . Prior Art Screen system removes floatables from storm water.     16 . Optional inflow gap.     20 . Deflector baffle box. Prior art.     30 . Floatables washed into baffle box with storm water.     40 . Storm water and floatables flow into baffle box.     50 . Inflow pipe.     60 . Storm water carry&#39;s floatables into screen system.     70 . Floatables filtered by screen system and accumulated for later removal.     80 . Filtered storm water flowing out of baffle box.     90 . Outflow pipe.     100 . Storm water flow into screen system diminished by backup of floatables in system.     110 . Storm water flow into system encounters backup of floatables and flows back out of the screen system entrance. Previously captured floatables, agitated by turbulence in the system, are washed out of the screen system.     120 . Backwash from the screen system flows around the system towards the outflow pipe carrying previously captured floatables out of the baffle box.     130 . Turbulence in the screen system agitates previously captured floatables.     140 . Screen system compromised by backup of floatables blocking free flow through the system.     150 . Storm water outflow from baffle box carry&#39;s previously captured floatables out of the system.     160 . Previously captured floatables.     170 . Waterline.     180 . Pivoting half panel responds to rate of storm water flow.     190 . Pivoting panel hinge.     200 . Cross beam in screen system secures the half panel hinge.     210 . Bracket attached to side of screen system acts as a down stop for the pivoting half panel.     220 . In a screen system that is not backed up with floatables, rising water level and increasing flow rate cause the pivoting half panel to swing up to accommodate flow.     230 . Screen system with pivoting half panel or full panel installed to prevent back-flow of previously captured floatables from escaping system.     240 . Storm water inflow encounters the half panel locked down by the back pressure inside of the screen system and flows around the screen system out the outflow pipe.     250 . Backup of floatables in screen system.     260 . Turbulence in backed up screen system applies pressure to the back of the half panel preventing previously collected floatables from escaping the screen system.     270 . Some diminished flow through the screen system is possible with a backup of floatables.     280 . Storm water flows out of baffle box containing no previously collected floatables.     290 . Half pivot panel locked down by turbulence in backed screen system.     300 . Storm water flows out of the sides of the screen system bypassing the previously captured floatables.     310 . Pivoting full panel.     320 . In a screen system that is not backed up with floatables, rising water level and increasing flow rate cause the pivoting full panel to swing up to accommodate flow.     330 . Storm water flows around pylon and into screen system.     340 . Storm water flows freely past pylon and through screen system.     350 . Half height pylon.     360 . Part of floor of screen system replaced by solid metal plate to support pylon.     370 . Screen system with half or full pylon installed.     380 . Diminished flow or storm water flowing into obstructed screen system flows out of the sides of the screen system.     390 . Back pressure from the obstructed screen system causes storm water to flow around the screen system.     400 . Full height pylon.
 
Half Pivot Panel Embodiment
   

       FIG. 3  shows a top perspective view of a baffle box  20  installed with a half pivot panel  180  in a low flow condition.  FIG. 4  is a cross-sectional side view of the baffle box with installed half pivot panel  180  along arrows  4 X of  FIG. 3 .  FIG. 4A  is an enlarged view of the installed half pivot panel  180  of  FIG. 4 . The embodiment  230  of  FIGS. 3-4  uses a screen system with installed pivoting half panel  180  to prevent back-flow of previously captured floatables from escaping the system  10 . 
     The half panel can have a length between approximately ¼ to approximately ¾ of the distance between the ceiling and floor of the screen system. The panel can have a length of approximately ½ to approximately ⅔ of the length between the ceiling and the floor of the screen system, and preferably be half the distance. The panel can be rigid such as being formed from metal, or fiberglass or plastic. The panel can be flexible and be formed from rubber, and similar materials. The panel can be solid. Alternatively, the panel can be porous with holes. 
     Referring to  FIGS. 3 ,  4  and  4 A, a half pivot panel  180  can be attached to a cross beam  200  by a pivoting panel hinge  190 . A bracket  210  attached to a side of the screen system  10  acts as a down stop for the pivoting half panel  180 . In this low flow condition the panel  180  is down against the down stops  210 . The incoming flowing storm water  60  with floatables creates a waterline  170  that allows the half panel to be in the down position. Without incoming storm water, gravity would tend to keep the panel  180  in a generally down position. 
     The pivoting panel  180  can articulate all the way to a substantially horizontal position so that during high flow events the water flow will not be encumbered by the panel  180 . If the screen system  230  does not become obstructed by debris there will be no chance for a hack flow to develop. However, if the screen system  140  becomes significantly obstructed and the flow is high a backflow can develop. If a backflow begins to develop the pivoting panel  180  will be forced down by the force of the backflow current. When the pivoting panel  180  is forced down it will act as a barrier to prevent already captured floating debris from escaping. 
     Optionally sometimes working in conjunction with the pivoting panel  180  can be an inflow gap  16  between the inflow pipe  50  and the screen system  230 . The inflow gap  16  allows for sediment coming with the floating debris in the storm water flowing into the vault to drop into a settling chamber beneath the vault. The inflow gap  16  can be directly under the inflow and before the bottom of the screen system begins. Because sediments are heavier than water they are concentrated along the bottom of the inflowing water  40  and within close proximity to the inflow gap. A relatively high percentage of the sediments will fall through the inflow gap  16  and into the lower sediment collection chamber(s). This changes the ratio of sediment to floatables in the screen system so that less sediment is involved with the collected floating debris. And this enables the floating debris to pass water flow more readily, and in doing so reduces the likelihood that a backflow current will develop. The gap can be any size opening that is larger than the hole size of the screens in the screen enclosure. 
     Once a storm water causing condition such as a rain event is over the collected floating debris will dry out and to fall off of the vertical walls of the screen system  230 . 
     If the screen system  230  has a screened lid the dried floating debris will fall off of the lid. As the floating debris falls off the screens the openings in the screens become available to handle the water flow from the next storm water type rain event. 
       FIG. 5  shows another top perspective view of the baffle box  20  with installed half pivot panel  180  of  FIG. 3  in a high flow condition.  FIG. 6  is a cross-sectional side view of the baffle box  20  with installed half pivot panel  180  of  FIG. 5  along arrow  6 X in a high flow condition.  FIG. 6A  is an enlarged view of the installed half pivot panel of  FIG. 6  in high flow condition. 
     In this high-flow condition the half panel  180  has been lifted by the high-flow waterline  170  to permit free passage through the screen system  10 . In a screen system  10  that is not backed up with floatables, rising water level and increasing flow rate cause the pivoting half panel  180  to swing up along arrow  220  to accommodate flow. 
       FIG. 7  is a top front perspective view of the baffle box  10  with a backed up screen system  10  and an installed half pivot panel  180 .  FIG. 8  is a cross-sectional side view of the baffle box  20  with backed up screen system  10  and installed half pivot panel  180  of  FIG. 7  along arrow  8 X. 
     Referring to  FIGS. 7-8 , back pressure from turbulence  260  inside the screen system  10  can cause locking of the half pivot panel  180  against the down stops  210  preventing previously collected floatables from escaping. Inflowing storm water is turned away by the half panel  180  and flows around the screen system  10  to the outflow pipe  90 . Some of the diminished flow  270  through the screen system  10  flows out the sides of the screen system  10  as shown by arrows  300 . 
     Storm water inflow  40  encounters the half panel  180  locked down by the back pressure inside of the screen system  140  and flows around  240  the screen system  140  out the outflow pipe  90 . 
     Turbulence  260  in the backed up screen system  140  applies pressure to the back of the half panel  180  preventing previously collected floatables from escaping the screen system  140 . The half pivot panel  180  is locked down  290  by the turbulence  260  in the backed up screen system  140 . 
     There is some possible diminished flow  270  through the screen system  140  with a backup of floatables  250 . At the outflow pipe  90 , storm water  280  flows out of the baffle box  20  containing no previously collected floatables. As previously described storm water flows out the sides of the screen system  140  along arrows  300  bypassing the previously captured floatables  70 ,  250 . 
     Full Pivot Panel 
       FIG. 9  is a top perspective view of baffle box  20  installed with a full pivot panel  310 .  FIG. 10  is a cross-sectional side, view of the baffle box  20  with installed full pivot panel  310  of  FIG. 9  along arrow  10 X.  FIG. 10A  is an enlarged view of the installed full pivot panel  310  of  FIG. 10 . 
     Similar to the half pivot panel  180 , the full pivot panel is also attached to a cross beam  200  by a hinge  190 . A bracket  210  attached to a side of the screen system  230  acts as a down stop for the pivoting full panel  310 . The full panel can have a length at least as long as the height between the ceiling and the floor of the screen system, and be made of similar materials and be solid or porous similar to the half panel, previously described. 
       FIG. 11  is a cross-sectional side view of the baffle box with installed full pivot panel of  FIG. 9  in a high flow condition.  FIG. 11A  is an enlarged view of the installed full pivot panel of  FIG. 11  in a high flow condition. In a screen system  230  installed with a full panel  310  and that is not backed up with floatables, rising water level  170  and increasing flow rate can cause the pivoting panel  310  to swing up to position  320  to accommodate flow. 
       FIG. 12  is a top perspective view of the baffle box  20  with a full pivot panel  310  installed with the screen system  140  being obstructed by floatables.  FIG. 13  is a cross-sectional side view of the screen system  140  of  FIG. 12  along arrow  13 X. 
     Referring to  FIGS. 12-13 , back pressure from turbulence  260  inside the screen system is locking the full pivot panel  310  against the down stops  210  preventing previously collected floatables from escaping. Inflowing storm water  40  is turned away by the full panel  310  and flows around  240  the screen system to the outflow pipe  90 . Diminished flow  270  under the panel  310  and into the screen system flows out of the sides of the screen system. 
     The larger and longer panels can be used when there are low amounts of floatables coming into the screen system at any time, and the larger and the longer of the panels can prevent captured floatables from escaping out of the screen system. The shorter panels (half panels) can be used in high flow conditions are occurring much more often. 
     Half Pylon Embodiment 
       FIG. 14  is a top perspective view of a baffle box  20  with a half pylon  350  installed at the head of the screen system  370 .  FIG. 15  is a top cross-sectional view of the baffle box  20  with half pylon  350  of  FIG. 14  along arrow  15 Y. 
     Referring to  FIGS. 14-15 , the half pylon  350  can be mounted on solid plate  360 , that replaces part of the floor of the existing screen system, the presence of the pylon  350  discourages back flow out of the screen system  370  which would release previously collected floatables. Water flows freely around  330  the pylon and through  340  the screen system  370 . 
     The pylons can be desirable over pivoting panels when the user does not want any moving parts. The pylons can have a lower amount of maintenance time and costs over the panels by not having any movable parts. 
       FIG. 16  is a top perspective view of the baffle box  20  with half pylon  350  installed and the screen system  140  obstructed by previously collected floatables.  FIG. 17  is a top cross-sectional view of the baffle box  20  with installed half pylon  350  of  FIG. 16  along arrow  17 Y. 
     The pylon  350  can be rigid, smooth, and shaped to spread the water flow entering the screen system. The height of the pylon  350  can vary depending of site specific criteria and the width of the pylon  350  can be approximately ⅓ the width of the screen system  2 . Floating debris that impacts the pylon  350  is able to easily slip off the pylon  350  and continue into the screen system  140 / 370 . The pylon  350  can have a wedge or triangular front face configuration that faces the incoming water flow. The triangle can range from approximately 30 degrees to over approximately 70 degrees. The sharper the tip and angle of the triangle, the greater the chance of breaking up debris, which will eliminate clogging effects in the system. 
     The front face of the pylon can also be flat so as not to cause shedding or breaking up of debris. Also the front face of the pylon can be convex rounded, and the like. 
     Generally, the flow entering a storm water vault is conveyed via a round pipe  50  and the water will enter centrally into the screen system  140 / 370  with significant velocity. This makes for a concentrated central flow in the screen system. The pylon  350  acts to spread the flow wide within the screen system  140 / 370  so that the flow entering the screen system is traveling at the same velocity across the width of the screen system. Because the flow is no longer concentrated in the screen system  2  a backflow is prevented from forming. Without a backflow previously captured debris will not be able to escape the screen system  140 / 370 , and additional debris will continue to be collected in the screen system. 
     Referring to  FIGS. 14-15 , the presence of the pylon  350  discourages back flow of previously collected floatables out of the obstructed screen system. Inflowing storm water  60  is turned away by the pylon  350  and back pressure  390  in the screen system and flows around  390  the screen system  140 / 370 . Diminished flow  380  around the pylon  350  and into the screen system  140  flows out  380  of the sides of the screen system. 
     Optionally, working in conjunction with the pylon  350  can be an inflow gap  16  or opening in the bottom of the screen system adjacent to the inflow, similar to that shown in the previous embodiment. As water flows into the storm water vault both sediments and floating debris can drop through the gap  16  into a sediment settling collection chamber in the bottom of the vault. The inflow gap  16  can be directly under the inflow and before the bottom of the screen system  140 / 370  begins. Because sediments are heavier than water they are concentrated along the bottom of the inflowing water and within close proximity to the inflow gap. A relatively high percentage of the sediments can fall through the inflow gap  16  and into the lower sediment collection chamber(s). This changes the ratio of sediment to floatables in the screen system so that less sediment is involved with the collected floating debris. This enables the floating debris to pass water flow more readily, and in doing so reduces the likelihood that a backflow current condition problem will develop in the screen system. 
     Once a storm water condition such as one caused by a rain event is over the collected floating debris will dry out and to fall off of the vertical walls of the screen system. If the screen system has a screened lid the dried floating debris will fall off of the lid. As the floating debris falls off the screens the openings in the screens become available to handle the water flow from the next storm water rain type event. 
     Full Pylon Embodiment 
       FIG. 18  is a top perspective view of a baffle box  20  with full height pylon  400  installed at the head of the screen system  370 .  FIG. 19  is a top cross-sectional view of baffle box  20  installed with the full pylon of  FIG. 18  along arrow  19 Y. 
     Referring to  FIGS. 18-19 , the full size pylon  400  can also be mounted on a plate  260 , such as a metal plate that replaces part of the floor of the screen system. The full size pylon can have a height rising from the floor of the screen system up to the ceiling of the screen system. The presence of the full height pylon  400  discourages back flow out of the screen system which would release previously collected floatables. Water flows freely around  330  the pylon  400  and through screen system  370 . 
       FIG. 20  is a top perspective view of the baffle box  20  with installed full pylon  400  of  FIG. 18  with screen system  370  being obstructed by previously collected floatables.  FIG. 21  is a top cross-sectional view of the baffle box  20  with installed full pylon  400  of  FIG. 20  along arrow  21 Y. 
     Referring to  FIGS. 20-21 , the presence of the full pylon discourages back flow of previously collected floatables out of the obstructed screen system. Inflowing storm water is turned away by the pylon  400  and back pressure  390  in the screen system and flows around the screen system. Diminished flow  380  around the pylon and into the screen system flows out of the sides of the screen system. The pylon can have some desirability over the pivoting panels since there are no moving parts, which can decrease maintenance labor and material costs. 
     Pivoting Panel and Pylon Combination Embodiment 
       FIG. 22  is a top perspective of baffle box  20  with half pylon  350  and half pivot panel  180  installed in the screen system  230 / 370 .  FIG. 23  is a cross-sectional side view of the baffle box with installed pylon and pivot panel of  FIG. 22  along arrow  23 X. 
     Referring to  FIGS. 22-23 , the pylon  350  will not be tall and the pivoting panel  180  will not reach all the way to the bottom of the screen system. The pylon  350  will act to spread the flows wide and the pivoting panel  180  will act as a barrier to prevent floating debris from escaping if a backflow current tries to form. Because the pivoting panel  180  does not extend to the bottom of the screen system it cannot be encumbered by captured debris. In addition, if the flow is small then floating debris can enter the screen system without having to push past the pivoting panel. By combining the best attributes of the pivoting panel  180  and the pylon  350  a backflow current condition in the screen system can be avoided enabling floating debris to be continuously collected without the loss of previously captured debris. 
     Referring to  FIGS. 22-23 , the half pylon  350 - and half pivot panel  180  can be installed similar to those in the previous embodiment. A low flow condition is shown by waterline  170  and the pivot panel  180  rests atop the pylon  350 . Water flows freely around  330  pylon  350  and under the pivot panel  180  and through the screen system  230 / 370 . 
       FIG. 24  is another cross-sectional side view of  FIG. 22  along arrow  23 X shown in a high flow condition. Increased water flow has raised the pivot panel.  FIG. 25  another cross-sectional side sectional view of  FIG. 22  along arrow  23 × with the screen system  230 / 370  obstructed by previously collected floatables. Water flows freely around  330  the pylon  350  and under the raised pivot panel  180  and through the screen system. 
     Back pressure  390  exerted by the obstruction locks the pivot panel  180  down  290 . The presence of the pylon  350  and pivot panel  180  discourages back flow of previously collected floatables out of the obstructed screen system. Inflowing storm, water is turned away by the pylon  350 /pivot panel  180  and flows around  380 / 390  the screen system. Diminished flow  380  around the pylon  350  and under the pivot panel  180  flows into the screen system out  380  of the sides of the screen system  230 / 370 . 
     Optionally, the effectiveness of the combined pivoting panel  180  and pylon  350  can by enhanced by using an inflow gap  16  or opening at the lead in to the screen system as described in the previous embodiments. As water flows into the storm water vault both sediments and floating debris drop through the gap  16  into a settling chamber in the bottom of the vault. The inflow gap  16  can be directly under the inflow and before the bottom of the screen system  230 / 370  begins. Because sediments are heavier than water they are concentrated along the bottom of the inflowing water and within close proximity to the inflow gap  16 . A relatively high percentage of the sediments will fall through the inflow gap  16  and into the lower sediment collection chamber(s). This changes the ratio of sediment to floatables in the screen system  2  so that less sediment is involved with the collected floating debris. And this enables the floating debris to pass water flow more readily, and in doing so reduces the likelihood that a backflow current condition will develop. 
     The gap can also act as a drain when the screen system is fully impacted (totally blocked off and will allow for floatables to be stored in a dry state between rainfalls. 
     Alternatively, the pylon can be attached to the roof of the screen system 
     Other embodiments can be used such as attaching a pivoting panel to the top of a pylon, so that the panel does not have to be attached to the screen system. 
     Once the storm water causing condition such as the rain event is over the collected floating debris will dry out and to fall off of the vertical walls of the screen system. If the screen system  2  has a screened lid the dried floating debris will fall off of the lid. As the floating debris falls off the screens the openings in the screens become available to handle the water flow from the next storm water type rain event. 
     While the invention has been described, disclosed, illustrated and shown in various terms of certain embodiments or modifications which it has presumed in practice, the scope of the invention is not intended to be, nor should it be deemed to be, limited thereby and such other modifications or embodiments as may be suggested by the teachings herein are particularly reserved especially as they fall within the breadth and scope of the claims here appended.