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Sources and mechanisms of nutrient transport in
lawn irrigation driven surface runoff are largely unknown. We investigated the
transport of nitrogen (N) and phosphorus (P) in lawn irrigation driven surface
runoff from a residential neighborhood (28 ha) of 56% impervious and 44%
pervious areas. Pervious areas encompassing turfgrass (lawns) in the
neighborhood were irrigated with the reclaimed water in common areas during the
evening to late night and with the municipal water in homeowner's lawns during
the morning. The stormwater outlet pipe draining the residential neighborhood
was instrumented with a flow meter and Hach autosampler. Water samples were
collected every 1-h and triple composite samples were obtained at 3-h intervals
during an intensive sampling period of 1-week. Mean concentrations, over 56
sampling events, of total N (TN) and total P (TP) in surface runoff at the
outlet pipe were 10.9±6.34 and 1.3±1.03 mg L-1, respectively. Of TN,
the proportion of nitrate-N was 58% and other-N was 42%, whereas of TP,
orthophosphate-P was 75% and other-P was 25%. Flow and nutrient (N and P)
concentrations were lowest from 6:00 a.m. to noon, which corresponded with the
use of municipal water and highest from 6:00 p.m. to midnight, which
corresponded with the use of reclaimed water. This data suggests that N and P
originating in lawn irrigation driven surface runoff from residential catchments
is an important contributor of nutrients in surface waters.