In
Brief:
| The Stormvault is a detention and sedimentation unit designed to remove sediment, oil/grease, trash/debris, hydrocarbons and P,N and metals. Jensen Precast lists typical site characteristics for the Stormvault would be a drainage area from 0.25-8 acres with up to 100% impervious area. It is typically configured to have a 6 hour drain down time and can capture about 75-83% of runoff producing events entirely and treats the first flush of other storms. The unit is a minimum of 19 feet long and can be lengthened in 8’ increments. As the length increases, slanted bottom baffles spaced at 8-16’ intervals are added. The first bottom baffle is just downstream of the momentum dissipation baffle at the inlet and the last baffle is upstream of the skimmer baffle at the outlet. There is a debris screen upstream of the outlet orifice to remove larger suspended materials (i.e. trash). The orifice at the outlet controls flow and is sized to allow the unit the empty between 5min and 24 hours. Floating absorbent pads remove oil and grease and need to be periodically replaced to maintain this functionality. Grated manhole covers are provided to aerate the unit. The Stormvault can be installed at shallow depth, 4.25’ from the outlet invert to the ground and is H20 full traffic rated. The manufacturer claims that TSS effluent event mean concentrations can be reduced from an average of 123mg/L to 16mg/L and has a TSS removal efficiency of 77%.
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