San Bernard -- Cataloging Unit 12090401

• San Bernard Coastal Accounting Unit 120904
  
• Lower Colorado-San Bernard Coastal Subregion 1209
  
• 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 2695.6 km² ( 1041.2 mi² ) [% in USA = 39.46, % in Region = 34.43]
  The area from the USGS is 1050 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 285)

  IV. Elevation Analysis

  This analysis is based on 1076804 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 38.1 m ( 125.0 ft ) [% in USA = 7.30, % in Region = 16.39]
  The elevation standard deviation is 27.2 m ( 89.2 ft ) [% in USA = 19.00, % in Region = 25.41]
  The coefficient of variation is 71.4 %.
  The vertical relief is 137.0 m ( 449.5 ft ) [% in USA = 16.01, % in Region = 22.95]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	5.0	15.0	23.0	30.0	33.0	38.5	46.0	57.0	76.5	137.0
  feet	0.0	16.4	49.2	75.5	98.4	108.3	126.3	150.9	187.0	251.0	449.5

  

  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	286.5	178.0	0.106	0.171	58.27	59.02
  Intermittent Shoreline	18.7	11.6	0.007	0.011	80.63	63.93
  Perennial Streams	764.2	474.9	0.283	0.456	54.00	81.97
  Intermittent Streams	598.3	371.9	0.222	0.357	34.49	36.89
  Canals	183.8	114.2	0.068	0.110	88.58	90.98
  1° roads	51.3	31.9	0.019	0.031	68.59	74.59
  2° roads	66.6	41.4	0.025	0.040	48.46	34.43
  3° roads	113.4	70.5	0.042	0.068	41.07	52.46
  4° roads	3683.7	2289.4	1.367	2.199	70.01	39.34
  Total Roads	3915.0	2433.2	1.452	2.337	65.85	39.34
  Railroads	216.6	134.6	0.080	0.129	79.25	86.07
  Pipes and Powerlines	88.4	55.0	0.033	0.053	54.52	43.44

  
  Of the natural water in this HUC, 37.00% (by length) is intermittent [% in USA = 40.12, % in Region = 27.05]

  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