Common Contracts
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Inter-Agency Agreement to Conduct Scientific Studies Relevant to the Stormwater Treatment Areas Agreement No. 4600003125February 5th, 2014
There are potential benefits to shallow water depths in PSTA systems, including increased light penetration to the benthic surface. However, because shallow water depths may be difficult to establish and maintain in full-scale STA flow paths, particularly under pulse loading conditions, the effects of water depth on PSTA performance must be better defined. Prior research with PSTA systems operated at 30 or 60 cm water depths showed no difference in phosphorus (P) removal performance, although static depth treatments outperformed variable depth treatments (CH2M-Hill 2003). The best performing experimental PSTA platforms were operated at 30 cm (STA-1W 0.2 ha test cells and mesocosms) and 9 cm (STA-1W mesocosm raceways, DeBusk et al. 2004). The STA-3/4 PSTA Cell typically has operated at a depth of 30-45 cm, with high flow events increasing average water depths to just over 60 cm.
