USGS Water-Year Summary for Site 50035000

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	Available Parameters
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

50035000 RIO GRANDE DE MANATI AT CIALES, PR

LOCATION - Lat 18°19'27.95", long 66°27'35.83" referenced to North American Datum of 1927, Ciales Municipio, PR, Hydrologic Unit 21010002, on left bank, 1.6 mi (2.6 km) upstream from State Road 145 bridge, 0.8 mi (1.3 km) downstream from Quebrada Saliente, 0.9 mi (1.4 km) upstream from Quebrada Cojo Vales, and 1.2 mi (1.9 km) southeast of Ciales.

DRAINAGE AREA - 134 mi². (347 km2), includes 6 mi² (15.5 km2), for upstream of Lago El Guineo and Lago de Matrullas reservoirs which was previously excluded.

REVISIONS HISTORY -

Maximum daily mean discharge entered for peak discharge for 1947, 1948, and 1957 water years. 1989 water year peak updated from complete gage height and discharge data set.

Drainage area revised in 2021 based on ArcHydro 2020, more detailed topo used.

SURFACE-WATER RECORDS

PERIOD OF RECORD - September 1946 to September 1953, May 1956 to December 1957; unpublished, files available at U.S. Geological Survey, Caribbean-Florida Water Science Center. February 1959 to September 1960; monthly discharge measurements only, October 1960 to current year. Equivalent record from January 1971 to December 1972 published as 50035200, Río Grande de Manatí at State Road 145 at Ciales at site, 1.6 mi (2.6 km) downstream, drainage area 132 mi² (342 km2).

GAGE - Water-stage recorder, satellite telemetry at station. Elevation of gage is 140 ft (43 m), above NGVD of 1929, from topographic map. Prior to April 1, 1962, staff gage read twice daily, at site 100 ft (30 m) upstream at same datum. January 1971 to December 1972 at site 1.6 mi (2.6 km) downstream at different datum. Since October 1, 1997, 2.00 ft (0.6 m) were added to gage datum.

EXTREMES OUTSIDE PERIOD OF RECORD - Approximate gage heights of major floods, pointed out by local residents are as follows: August 1899, 50 ft (15 m), September 1928, 36 ft (11 m), and September 1932, 34 ft (10 m) at site 1.6 mi (2.6 km) upstream.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT DISCHARGE: December 2001 to September 30, 2009.

INSTRUMENTATION - Sediment samples were collected by a local observer on a weekly basis. During high flow events sediment samples were collected with automatic sediment sampler.

REMARKS - Sediment samples were collected by a local observer on a weekly basis. During high flow events sediment samples were collected with automatic sediment sampler.

EXTREMES FOR PERIOD OF DAILY RECORD - SEDIMENT CONCENTRATIONS: Maximum daily mean, 11,600 mg/L October 11, 2005; minimum daily mean, 1 mg/L several days during several years. SEDIMENT LOADS: Maximum daily mean, 383,000 tons (347,000 tonnes) October 11, 2005; minimum daily mean, 0.15 ton (0.14 tonne) July 18, 2003

EXTREMES FOR CURRENT YEAR - FOR WATER YEAR 2007: SEDIMENT CONCENTRATIONS: Maximum daily mean, 377 mg/L October 19, 2006; minimum daily mean, e1 mg/L October 2, 2006. SEDIMENT LOADS: Maximum daily mean, 5,090 tons (4,620 tonnes) October 19, 2006; minimum daily mean, 0.45 ton (0.41 tonne) March 19, 2007. FOR WATER YEAR 2008: SEDIMENT CONCENTRATIONS: Maximum daily mean, 647 mg/L September 22, 2008; minimum daily mean, 2 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 3,060 tons (2,770 tonnes) September 22, 2008; minimum daily mean, 0.39 ton (0.35 tonne) August 24, 2008. FOR WATER YEAR 2009: SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,450 mg/L May 8, 2009; minimum daily mean, 3 mg/L January 10, 2009. SEDIMENT LOADS: Maximum daily mean, 60,900 tons (55,200 tonnes) May 8, 2009; minimum daily mean, 1.4 ton (1.3 tonne) January 10, 2009.