Environmental Engineering Reference
In-Depth Information
continuous method. The resulting management plan focused on changing agri-
cultural practices to reduce sediment transport (no-till, minimum tillage, contour
farming, and nutrient application reduction), and the then-new Detroit Regional
Wastewater Treatment Facility (1 billion gallons per day) included phosphorus
removal in the unit operations. However, the urban runoff contribution was not
included in the plan.
Non-Point Source Model Calibration in Honey Creek (1979)
In 1977, the EPA was attempting to develop experience in the use of the NPS
model designed by Hydrocomp, Inc., as well as the agricultural runoff model,
also developed by Hydrocomp. The Honey Creek watershed (Figure B-6), a
187-square mile tributary of the Sandusky River in northern Ohio, tributary to
Lake Erie, had been studied during the Lake Erie water quality program and a
rich database of both land use characteristics as spatial data and stormwater chem-
istry and phosphorus transport during wet weather had been created by Cahill
Associates and the Heidelberg College laboratory (directed by David Baker).
With this information, the NPS model was calibrated to simulate the pollutant
transport process.
The original NPS model was written for small catchments and lacked stream
transport and routing subroutines in the original format, so 14 subbasins within the
watershed were routed to the continuous recording gage station at Melmore. The
NPS model also assumed certain flow pathways, which were different in Honey
Creek, which is an intensively cultivated basin with tile underdrains creating a
Figure B-6
Honey Creek was calibrated for the NPS and ARM models, 1977.
Search WWH ::
Custom Search