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USGS Water-Year Summary 2024
08169000 Comal River at New Braunfels, TX
LOCATION - Lat 29°42'23.07", long 98°07'19.95" referenced to North American Datum of 1983, Comal County, TX, Hydrologic Unit 12100202, on right bank 200 ft upstream from San Antonio Street viaduct in New Braunfels and 1.1 mi upstream from mouth.
DRAINAGE AREA - 130 mi². of contributing surface drainage, however, most of the time flow is solely from Comal Springs.
REVISIONS HISTORY - WSP 2123: Drainage area. Period 03/10/2023 to 08/01/2024 was revised on 10/22/2024 to remove gage data that were affected by orifice restriction and silting. Affected gage heights were removed, and discharge was recomputed.
SURFACE-WATER RECORDS
PERIOD OF RECORD - 1882 to Nov. 1927 (discharge measurements only), Dec. 1927 to Sept. 1932 (daily mean discharges below base, and stage-discharge relation is not affected by backwater from Guadalupe River), Oct. 1932 to current year.
PERIOD OF RECORD, Water-Quality.--
CHEMICAL DATA: Apr. 1996 to June 1998.
BIOCHEMICAL DATA: Apr. 1996 to June 1998.
BIOLOGICAL DATA: Aug. 1995 to Dec. 1996.
PESTICIDE DATA: Dec. 1996 to June 1998.
RADIOCHEMICAL DATA: Aug. 1995 to Dec. 1996.
STABLE ISOTOPE DATA: Feb. 1998 to Mar. 1998.
SEDIMENT DATA: Aug. 1995, Apr. 1996 to June 1998.
PERIOD OF DAILY RECORD, Water-Quality.--
SPECIFIC CONDUCTANCE: Mar. 1996 to Sept. 1998.
pH: Mar. 1996 to Sept. 1998.
WATER TEMPERATURE: Mar. 1996 to Sept. 1998.
DISSOLVED OXYGEN: Mar. 1996 to Sept. 1998.
GAGE - Water-stage recorder. Prior to Jan. 7, 1928, nonrecording gage at same site. Concrete control since Oct. 3, 1955. Datum of gage is 583.036 ft. above NAVD of 1988. The NAVD of 1988 datum was determined by a level 2 GNSS survey (Reference Frame NAD_83 (2011) (EPOCH:2010.0000). (GEOID18) by USGS on December 20,2024 and tied to TBM. Prior to December 20, 2024, the datum of gage was 582.800 ft. above NGVD of 1929. Satellite telemeter at station.
REMARKS - For the 2018 Water Year, the records are good, except for those discharges above 1,000 cfs, which are poor. Entire flow of river is from Comal Springs except during periods of local runoff. Comal Springs emerges from the Edwards and associated limestones in the Balcones Fault Zone about 1.0 mi upstream. Flow is affected at times by cleanup operations by the city of New Braunfels at Landa Park Lake and at times by discharge from the flood-detention pools of five floodwater-retarding structures. These structures control runoff from 74.6 mi² above station. Stage-discharge relation is affected at times by backwater from the Guadalupe River. Some records listed in the "Period of Record" for surface water and water quality may not be available electronically.
EXTREMES FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1882-1974: Maximum discharge 60,800 ft³/s May 11, 1972 (gage height, 36.55 ft.).
AVERAGE DISCHARGE FOR PERIOD PRIOR TO REGULATION - WATER YEARS 1884-1974: Maximum discharge 60,800 ft³/s May 11,1972 (gage height 36.55 ft.).
WATER-QUALITY RECORDS
PERIOD OF RECORD -
CHEMICAL DATA: Apr. 1996 to June 1998.
BIOCHEMICAL DATA: Apr. 1996 to June 1998.
BIOLOGICAL DATA: Aug. 1995, Dec. 1996.
PESTICIDE DATA: Dec. 1996, June 1998.
SEDIMENT CHEMISTRY DATA: Aug. 1995.
SEDIMENT DATA: Apr. 1996 to June 1998.
PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Mar. 1996 to Sept. 1998.
WATER TEMPERATURE: Mar. 1996 to Sept. 1998.
pH: Mar. 1996 to Sept. 1998.
DISSOLVED OXYGEN: Mar. 1996 to Sept. 1998.
