CTMP Revision 0 Figure 4: Mini floc shed. Figure 5: Erosion Control's floc box. 4.1.1 Area of rainwater catchment tray required for rainfall activated system The area of the rainwater catchment tray is determined by the dose required, and the area of the earthwork catchment draining to the sediment control device. The rainwater catchment tray size is determined by the total land catchment area draining to the sediment control device including both the ‘open’ area and stable areas. If the catchment area is changed, then the catchment tray size should also be changed in proportion. Reduction of the tray size is easily achieved by placing a piece of plywood on top of the upstand over the lower end of the tray,
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