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Performance of a ‘Transitioned' Infiltration Basin Part 2: Nitrogen and Phosphorus Removals
Author(s) -
Natarajan Poornima,
Davis Allen P.
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143015x14362865226077
Subject(s) - stormwater , infiltration (hvac) , environmental science , kjeldahl method , surface runoff , hydrology (agriculture) , retention basin , denitrification , water quality , nitrate , phosphorus , environmental chemistry , nitrogen , environmental engineering , chemistry , ecology , geology , geography , meteorology , geotechnical engineering , organic chemistry , biology
Infiltration basins have been widely used for stormwater runoff management. However, their longevity could be compromised over time, up to the point of operational failure. This research study showed that a ‘failed' infiltration basin can ‘transition' into a wetpond/wetland‐like practice and provide water quality benefits. Performance evaluation over three years showed that the transitioned infiltration basin reduced the discharge event mean concentrations of total phosphorus (TP), dissolved phosphorus (DP), particulate phosphorus (PP), NO x ‐N (nitrate + nitrite), total Kjeldahl nitrogen (TKN), organic‐N (ON), and total nitrogen (TN) during most storm events. Exports of TP, DP, ON, and TKN masses were observed only during the coldest periods. The cumulative mass removals were 61% TP, 53% DP, 63% PP, 79% NO x ‐N, 51% TKN, 45% ON, and 64% TN. The dry‐weather nutrient concentrations combined with the environmental conditions at the transitioned basin indicated that sedimentation, adsorption, denitrification, and volume reduction were the removal mechanisms.