Central Matagorda Bay -- Cataloging Unit 12100401

• Central Texas Coastal Accounting Unit 121004
  
• Central Texas Coastal Subregion 1210
  
• 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 2552.0 km² ( 985.8 mi² ) [% in USA = 35.29, % in Region = 30.33]
  The area from the USGS is 1300 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 254)

  IV. Elevation Analysis

  This analysis is based on 1019422 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 10.3 m ( 33.8 ft ) [% in USA = 2.79, % in Region = 9.02]
  The elevation standard deviation is 7.5 m ( 24.6 ft ) [% in USA = 3.41, % in Region = 9.02]
  The coefficient of variation is 72.8 %.
  The vertical relief is 34.9 m ( 114.5 ft ) [% in USA = 2.89, % in Region = 9.02]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	1.0	3.0	6.0	7.0	8.4	11.6	14.1	17.0	21.0	34.9
  feet	0.0	3.3	9.8	19.7	23.0	27.6	38.1	46.3	55.8	68.9	114.5

  

  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	581.8	361.6	0.228	0.367	83.99	82.79
  Intermittent Shoreline	24.6	15.3	0.010	0.016	84.79	73.77
  Perennial Streams	388.3	241.3	0.152	0.245	32.54	56.56
  Intermittent Streams	762.8	474.1	0.299	0.481	44.72	48.36
  Canals	532.7	331.0	0.209	0.336	97.21	99.18
  1° roads	3.8	2.4	0.001	0.002	42.44	34.43
  2° roads	6.8	4.2	0.003	0.004	18.90	6.56
  3° roads	192.8	119.8	0.076	0.122	63.24	90.16
  4° roads	3261.4	2027.0	1.278	2.056	62.43	22.13
  Total Roads	3464.7	2153.3	1.358	2.184	56.80	20.49
  Railroads	128.9	80.1	0.051	0.081	59.45	63.11
  Pipes and Powerlines	118.5	73.7	0.046	0.075	67.55	60.66

  
  Of the natural water in this HUC, 44.80% (by length) is intermittent [% in USA = 47.28, % in Region = 34.43]

  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