Atascosa -- Cataloging Unit 12110110

• Nueces Accounting Unit 121101
  
• 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 3630.6 km² ( 1402.4 mi² ) [% in USA = 58.88, % in Region = 58.20]
  The area from the USGS is 1420 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 320)

  IV. Elevation Analysis

  This analysis is based on 1450038 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 130.1 m ( 426.8 ft ) [% in USA = 18.10, % in Region = 40.98]
  The elevation standard deviation is 41.4 m ( 135.8 ft ) [% in USA = 32.69, % in Region = 47.54]
  The coefficient of variation is 31.8 %.
  The vertical relief is 204.0 m ( 669.3 ft ) [% in USA = 29.56, % in Region = 43.44]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	39.0	79.1	91.0	105.0	113.4	123.5	137.0	152.0	167.0	191.4	243.0
  feet	128.0	259.5	298.6	344.5	372.0	405.2	449.5	498.7	547.9	627.9	797.2

  

  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	218.1	135.6	0.060	0.097	40.03	38.52
  Intermittent Shoreline	9.1	5.7	0.003	0.004	67.46	49.18
  Perennial Streams	43.9	27.3	0.012	0.019	7.48	11.48
  Intermittent Streams	1955.1	1215.1	0.539	0.866	74.14	97.54
  Canals	16.3	10.1	0.004	0.007	57.32	72.95
  1° roads	122.1	75.9	0.034	0.054	82.14	85.25
  2° roads	66.3	41.2	0.018	0.029	39.70	25.41
  3° roads	149.5	92.9	0.041	0.066	40.36	51.64
  4° roads	5296.3	3291.6	1.459	2.347	76.22	51.64
  Total Roads	5634.1	3501.6	1.552	2.497	72.52	53.28
  Railroads	128.6	79.9	0.035	0.057	44.53	42.62
  Pipes and Powerlines	216.1	134.3	0.060	0.096	78.73	81.97

  
  Of the natural water in this HUC, 88.23% (by length) is intermittent [% in USA = 86.83, % in Region = 90.16]

  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