Table 2.  Regression coefficients and coefficients of determination for discharge ratings at lower Laguna Madre discharge measurement sites

[equation: Q = B1 + B2V + B3S, where Q is estimated discharge in cubic feet per second, B1, B2, and B3 are regression coefficients, V is measured velocity in feet per second, and S is measured stage in feet above (+) or below (-) the mean stage measured during the hydrographic survey. R2, coefficient of determination (variability in the measured discharges explained by the equation); n/a, not applicable]

Site
number

Site name

B1

B2

B3

R2

1

Laguna Madre at Brazos Santiago Pass

-348

50,739

0

0.96

2

South Bay Pass

147

5,474

-325

.97

3

Brownsville Ship Channel

n/a

n/a

n/a

n/a

4

Port Isabel Channel

-4,446

16,903

0

.81

5

Laguna Madre at Queen Isabella Causeway

-1,560

36,356

0

.98

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