South Laguna Madre -- Cataloging Unit 12110208

• Southwestern Texas Coastal Accounting Unit 121102
  
• Nueces-Southwestern Texas Coastal Subregion 1211
  
• Texas-Gulf Region 12 (There are 122 cataloging units in this region.)
  The state composition by area is 100.0% Texas.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 6303.8 km² ( 2434.9 mi² ) [% in USA = 88.92, % in Region = 85.25]
  The area from the USGS is 2960 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 832)

  IV. Elevation Analysis

  This analysis is based on 2517940 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 17.6 m ( 57.7 ft ) [% in USA = 4.55, % in Region = 12.30]
  The elevation standard deviation is 18.6 m ( 61.0 ft ) [% in USA = 9.62, % in Region = 15.57]
  The coefficient of variation is 105.7 %.
  The vertical relief is 111.1 m ( 364.5 ft ) [% in USA = 10.37, % in Region = 16.39]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	3.0	5.0	7.0	8.0	12.0	15.0	19.9	26.0	38.0	111.1
  feet	0.0	9.8	16.4	23.0	26.2	39.4	49.2	65.3	85.3	124.7	364.5

  

  V. Map Line Analysis

  Note- percentiles are for the feature density, not for the raw total lengths.
  

  line type	km	mi	km/km²	mi/mi²	% in USA	% in Region
  Perennial Shoreline	2104.9	1308.2	0.334	0.537	92.14	90.98
  Intermittent Shoreline	313.3	194.7	0.050	0.080	96.73	93.44
  Perennial Streams	1397.5	868.6	0.222	0.357	43.53	70.49
  Intermittent Streams	86.9	54.0	0.014	0.022	7.72	4.92
  Canals	1315.8	817.8	0.209	0.336	97.25	100.00
  1° roads	54.3	33.7	0.009	0.014	53.06	54.10
  2° roads	348.7	216.7	0.055	0.089	86.64	93.44
  3° roads	291.0	180.9	0.046	0.074	43.96	56.56
  4° roads	12985.1	8070.3	2.060	3.314	93.56	93.44
  Total Roads	13679.1	8501.6	2.170	3.492	91.99	93.44
  Railroads	471.0	292.7	0.075	0.120	76.41	82.79
  Pipes and Powerlines	150.1	93.3	0.024	0.038	43.39	31.97

  
  Of the natural water in this HUC, 10.25% (by length) is intermittent [% in USA = 15.35, % in Region = 9.84]

  VI. Other sites

  • EPA- Surf Your Watershed - Index of Watershed Indicators
  • USGS- Science in Your Watershed - Selected Realtime Streamflow Stations
  • CTIC- Known Your Watershed

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  1999 SEPT 4, Last updated on 2003 JAN 23
  
  D.L. Gustafson, dlg@rapid.msu.montana.edu