Big Bend -- Cataloging Unit 13040205

• Rio Grande-Amistad Accounting Unit 130402
  
• Rio Grande-Amistad Subregion 1304
  
• Rio Grande Region 13 (There are 70 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 2777.8 km² ( 1073.0 mi² ) [% in USA = 41.83, % in Region = 34.29]
  The area from the USGS is 1100 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 301)

  IV. Elevation Analysis

  This analysis is based on 1109391 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 909.4 m ( 2983.6 ft ) [% in USA = 70.63, % in Region = 22.86]
  The elevation standard deviation is 264.9 m ( 869.1 ft ) [% in USA = 79.06, % in Region = 68.57]
  The coefficient of variation is 29.1 %.
  The vertical relief is 2319.2 m ( 7608.8 ft ) [% in USA = 93.89, % in Region = 97.14]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	630.9	673.1	732.0	793.4	859.4	930.9	1005.1	1094.1	1247.5	2319.2
  feet	0.0	2069.9	2208.3	2401.5	2603.0	2819.5	3054.1	3297.5	3589.5	4092.8	7608.8

  

  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	1.4	0.9	0.001	0.001	2.23	20.00
  Intermittent Shoreline	1.2	0.8	0.000	0.001	43.44	2.86
  Perennial Streams	109.4	68.0	0.039	0.063	14.54	62.86
  Intermittent Streams	1890.2	1174.8	0.680	1.095	86.69	91.43
  Canals	0.0	0.0	0.000	0.000	35.62	40.00
  1° roads	0.0	0.0	0.000	0.000	30.84	47.14
  2° roads	0.0	0.0	0.000	0.000	15.35	12.86
  3° roads	0.0	0.0	0.000	0.000	4.07	11.43
  4° roads	804.1	499.7	0.289	0.466	2.04	1.43
  Total Roads	804.1	499.7	0.289	0.466	1.80	1.43
  Railroads	0.0	0.0	0.000	0.000	12.60	27.14
  Pipes and Powerlines	5.8	3.6	0.002	0.003	12.84	37.14

  
  Of the natural water in this HUC, 94.47% (by length) is intermittent [% in USA = 92.61, % in Region = 52.86]

  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