Human impact
editSediment deposition
editDue to the high rate of sediment deposition that surpasses the federally-mandated total maximum daily load, Los Peñasquitos Lagoon is listed as a category 5 impaired body of water under section 303(d) of the Clean Water Act.[1] This is primarily due to the adverse effects of sedimentation in the lagoon itself and also within its vast watershed. These effects include drops in photosynthetic productivity, higher concentrations of heavy metals, and overall loss of ecosystem biodiversity within the estuary.[2][3] In addition to ecological impacts, sedimentation in the Los Peñasquitos watershed has led to significant issues within its storm water infrastructure. Specifically, sediment accumulation in flood control channels has greatly reduced original storm water conveyance capacity. This is primarily due to the vegetation that grows within the channels as a result of siltation.[4] Regular maintenance of these channels by the Storm Water Division is therefore a necessity to ensure proper flood control.[5][6] Despite the need for sufficient flood control through regular channel maintenance, the extensive permitting process involved requires selection and planning that extends nearly two years before any service activities.[7]
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- ^ "Final California 2010 Integrated Report( 303(d) List/305(b) Report) Supporting Information". State Water Resources Control Board. California Environmental Protection Agency. 2006. Retrieved 31 October 2016.
- ^ Isla, Federico Ignacio (2009-06-30). Coastal Zones and Estuaries. EOLSS Publications. ISBN 9781848260160.
- ^ "Sedimentation and Erosion — Caribbean Environment Programme". www.cep.unep.org. Retrieved 2016-11-01.
- ^ "10C-052" (PDF). State Water Resources Control Board. California Environmental Protection Agency. 8 September 2010. Retrieved 31 October 2016.
- ^ Jarque, Anne (1 November 2010). "Maintenance Activity Report" (PDF). The City of San Diego. The City of San Diego. Retrieved 31 October 2016.
- ^ "Maintenance Plans for: Sorrento Channels Reach 3 & 7" (PDF). City of San Diego. City of San Diego. Retrieved 31 October 2016.
- ^ "Environmental Committee - October 12th, 2016". City of San Diego. City of San Diego. 12 October 2016. Retrieved 31 October 2016.