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Table 1. Water properties and major ion concentrations, Comal Springs riverine system, New Braunfels, Texas, 1993–94.

[mS/cm, microsiemens per centimeter at 25 °C; °C, degrees Celsius; mg/L, milligrams per liter; CaCO3, calcium carbonate; <, less than; NA, not available; ft3/s, cubic feet per second]

Constituent

New Channel

 

Comal River1

Site A   Site B Site E
Summer
(9/20/93)
Winter
(2/3/94)
Summer
(9/20/93)
Winter 
2/3/94)
Summer
(9/20/93)
Winter
(2/3/94)

Specific conductance (mS/cm)

548

509

547

509

544

514

pH (standard units)

    7.6

    7.4

    7.8

    7.3

    7.8

    7.1

Temperature (°C)

  24

  23

  24

  22.5

  24.5

  22

Dissolved oxygen (mg/L)

    7.2

    8.2

    9

    9.5

    9

    9.4

Calcium, dissolved (mg/L)

  83

  82

  81

  82

  80

  82

Magnesium, dissolved (mg/L)

  16

  16

  16

  16

  16

  16

Sodium, dissolved (mg/L)

    9.9

    9.7

  11

  10

  10

  10

Potassium, dissolved (mg/L)

   .7

    1.3

    .7

    1.3

      .7

    1.3

Alkalinity (mg/L as CaCO3)

230

230

230

230

240

230

Sulfate, dissolved (mg/L)

  23

  24

   24

  24

  23

  24

Chloride, dissolved (mg/L)

  15

  16

  15

  16

  15

  16

Fluoride, dissolved (mg/L)

    .2

    .2

    .2

    .2

      .2

    .2

Silica, dissolved (mg/L)

  12

  11

  12

  11

  12

  11

Dissolved solids, sum of constituents (mg/L)

307

309

308

309

307

310

 

Constituent

Old Channel

 

Comal River1

Site C

 

Site D

Site E

Summer
(8/20/93)
Winter
(3/3/94)
Summer
(8/20/93)
Winter
(3/3/94)

Summer
(8/20/93)

Winter
(3/3/94)

Specific conductance (mS/cm)

552

529

565

523

547

541

pH (standard units)

    7.7

    6.9

  7.5

    7.3

    7.6

    7.3

Temperature (°C)

  24

  21.5

  25.5

  20.5

  26

  23

Dissolved oxygen (mg/L)

    8.1

  11.4

    4.4

  11.8

    9.2

  12

Calcium, dissolved (mg/L)

  83

  82

  85

  81

  84

  81

Magnesium, dissolved (mg/L)

  16

  16

  16

  16

  16

  16

Sodium, dissolved (mg/L)

    9.6

  10

  10

  11

    9.5

  11

Potassium, dissolved (mg/L)

    1.9

    1.3

    1.6

    1.3

    <.10

    1.3

Alkalinity (mg/L as CaCO3)

230

240

240

240

230

240

Sulfate, dissolved (mg/L)

  25

  24

  26

  24

  25

  24

Chloride, dissolved (mg/L)

  16

  15

  16

  16

  16

  15

Fluoride, dissolved (mg/L)

      .3

    .2

      .2

      .2

      .2

      .2

Silica, dissolved (mg/L)

  12

  12

  11

  10

  12

  11

Dissolved solids, sum of constituents (mg/L)

309

310

314

310

NA

309

1Daily mean flow, 08169000 Comal River at New Braunfels: 350 ft3/s - 8/20/93, 339 ft3/s - 9/20/93, 351 ft3/s - 2/3/94, 337 ft3/s - 3/3/94.

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