Intensive Survey of the Guadalupe River Segment 1806

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TEXAS WATER COMMISSION Paul Hopkins, Chairman Ralph Roming, Commissioner John O. Houchins, Commissioner Larry Soward, ExecutiveDirector Authorization for use or reproduction ofany originalmaterialcontainedin this publication, i.e., not obtained from other sources, is freely granted. The Commission would appreciate acknowledgement. Published and distributed by the Texas Water Commission Post Office Box 13087 Austin, Texas 78711
ABSTRACT An intensive survey of Guadalupe River Segment 1806 was conducted November 1-3, 1983, by the Texas Water Commission (Predecessor agency Texas Department of Water Resources). Segment 1806 of the Guadalupe River extends from the headwaters of Canyon Lake in Comal County to the confluence of the North and South Forks near Hunt in Kerr County, a distance of 168.2 km (104.5 mi). Water quality, hydraulic, and biological data were collected at 11 mainstream stations, three tributary streams, and the City of Kerrville wastewater treatment plant in the area upstream of SH 87 near Comfort to the upper segment boundary. Stream discharge was relatively stable (range 1.25-1.28 m3/s) in the two reaches where measurements were made. Stream widths were variable (9-60 m) due to natural changes in topography and repeated mainstream impoundments located within the segment and stream velocities were moderate (0.078-0.12 m/s). Dissolved oxygen levels remained above the 5 mg/L stream criterion throughout the diurnal period at all mainstream stations. Levels of nitrogenous and carbonaceous oxygen demanding substances were low throughout the study area. Orthophosphorus and nitrate nitrogen levels were low enough to suggest that either would be limiting to aquatic plant growths in different areas of the stream. Chlorophyll a levels were less than 2 yg/L at most stations reflecting the low primary productivity of the stream. Chloride, sulfate, total dissolved solids, water temperature, pH and fecal coliform levels generally conformed to segment criteria. Benthic macroinvertebrate community structure reflected clean water and stable environmental conditions throughout the study reach. Highest levels of oxygen demanding substances, nutrients, chlorophyll a, chloride, sulfate, and total dissolved solids were observed at the upstream station on Third Creek, the tributary stream which receives periodic discharges from the City of Kerrville wastewater treatment plant. iii
Page 1: INTENSIVE SURVEY OF GUADALUPE RIVER
Page 5 and 6: TABLE OF CONTENTS CONTINUED Page Be
Page 7 and 8: METHODS Field and laboratory proced
Page 9 and 10: wheat and oats are grown in the reg
Page 11 and 12: 40, and 400 mg/L (annual averages).
Page 13 and 14: indicating the highest need for str
Page 15 and 16: consideration. An abundance of orth
Page 17 and 18: increase in the importance of pollu
Page 19 and 20: CONCLUSIONS The historical data and
Page 22 and 23: TABLE 1 Guadalupe River Sampling Lo
Page 24 and 25: to Station Location IH 10 in Comfor
Page 26 and 27: to CO Station/SMN Number Center Poi
Page 28 and 29: SO CJI Station Location/ SMN Number
Page 30 and 31: to *3 5.65 200 4.52 -- -- 1 60 RR 3
Page 32 and 33: Figure 4 Location of Hydraulic Meas
Page 34 and 35: Figure 5 Location of Cross Sectiona
Page 36 and 37: TABLE 8 Guadalupe River Field Measu
Page 38 and 39: TABLE 8 CONTINUED Map Code Water Di
Page 40 and 41: 1800.9010 11/01/83 COMP 0.3 20.0 4.
Page 42 and 43: CO CD Map Code Station Number of In
Page 44 and 45: Map Code Station 0STRAC0DA Taxon St
Page 46 and 47: 4* CO Map Code Station Taxon EPHEME
Page 48 and 49: TABLE 12 Percentage Composition of
Page 50 and 51: APPENDIX A >.fl&^fc- .. - -.^K&ST
Page 52 and 53:
Laboratory Analyses Parameter Five
Page 54 and 55:
Selection of a specific test site m
Page 56 and 57:
BENTHIC MACROINVERTEBRATES 2 Benthi
Page 58 and 59:
Samples are stored in quart cubitai
Page 60 and 61:
where DOj = initial dissolved oxyge
Page 62 and 63:
Samples are transferred to the labo
Page 64 and 65:
REFERENCES CITED 1. American Public
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Intensive Survey of the Guadalupe River Segment 1806

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