During winter months, cold and ice may
result in inaccurate real-time gage height and streamflow data.
Adjustments or deletions of this data can only be done after detailed
analysis.
Funding for this site is provided by:
SURFACE-WATER RECORDS
LOCATION.--Lat 40°16'16", long 74°46'24"
referenced to North American Datum of 1983, Ewing Township, Mercer
County, NJ, Hydrologic Unit 02040105, on upstream left bank of dam at
outlet of Sylva Lake, on the campus of The College of New Jersey, 0.3
mi downstream from the outlet of Ceva Lake, 0.4 mi downstream of bridge
on Ewingville Road, and 0.6 mi southeast of Ewingville.
DRAINAGE AREA.--3.99 mi².
PERIOD OF RECORD.--Continuous-record discharge station, November
2008 to current year.
GAGE.--Water-stage and precipitation recorder with telemetry,
crest-stage gage, and concrete dam. Datum of gage is 86 ft above NAVD
of 1988.
REMARKS.--Records fair, except for estimated discharges, which
are poor. Discharges above 1,100 ft³/s from rating curve extension on
basis flow-over-dam computation of peak flow.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,040 ft³/s,
from rating curve extended above 1,100 ft³/s on basis of flow-over-dam
computation of peak flow, Aug 22, 2009, gage height, 6.30 ft; minimum
discharge, 0.00 ft³/s, many days.
EXTREMES OUTSIDE PERIOD OF RECORD.--The flood of July 21, 1975
reached a stage of 95.3 ft above NGVD of 1929, from flood marks,
discharge of 5,550 ft³/s computed by a combination of flow-over-dam and
flow-over-embankment computations. The flood of Aug 28, 1971 reached a
stage of 94.2 ft above NGVD of 1929.
Peak
Flood Chart
Rain gage data is available from this location at this link
