San Ambrosia-Santa Isabel -- Cataloging Unit 13080002

• Rio Grande-Falcon Subregion 1308
  
• 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 4571.0 km² ( 1765.6 mi² ) [% in USA = 72.52, % in Region = 60.00]
  The area from the USGS is 1760 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 412)

  IV. Elevation Analysis

  This analysis is based on 1827225 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 202.9 m ( 665.7 ft ) [% in USA = 24.68, % in Region = 5.71]
  The elevation standard deviation is 35.2 m ( 115.5 ft ) [% in USA = 27.14, % in Region = 2.86]
  The coefficient of variation is 17.3 %.
  The vertical relief is 176.5 m ( 579.1 ft ) [% in USA = 24.16, % in Region = 2.86]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	102.2	152.4	169.4	183.0	197.0	207.0	214.3	227.3	236.2	245.4	278.7
  feet	335.3	500.0	555.8	600.4	646.3	679.1	703.1	745.7	774.9	805.1	914.4

  

  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	651.5	404.9	0.143	0.229	69.49	94.29
  Intermittent Shoreline	26.2	16.3	0.006	0.009	78.64	58.57
  Perennial Streams	109.2	67.9	0.024	0.038	10.66	55.71
  Intermittent Streams	2088.1	1297.8	0.457	0.735	64.38	57.14
  Canals	122.7	76.2	0.027	0.043	77.59	82.86
  1° roads	32.0	19.9	0.007	0.011	51.35	71.43
  2° roads	114.2	71.0	0.025	0.040	49.17	71.43
  3° roads	12.5	7.8	0.003	0.004	5.68	15.71
  4° roads	6380.7	3965.6	1.396	2.246	71.91	90.00
  Total Roads	6539.4	4064.3	1.431	2.302	63.86	90.00
  Railroads	68.8	42.8	0.015	0.024	24.68	55.71
  Pipes and Powerlines	138.7	86.2	0.030	0.049	51.68	81.43

  
  Of the natural water in this HUC, 73.54% (by length) is intermittent [% in USA = 73.14, % in Region = 18.57]

  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