Elm-Sycamore -- Cataloging Unit 13080001

• 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 4085.2 km² ( 1578.0 mi² ) [% in USA = 66.04, % in Region = 54.29]
  The area from the USGS is 1580 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 209)

  IV. Elevation Analysis

  This analysis is based on 1633091 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 361.6 m ( 1186.3 ft ) [% in USA = 46.52, % in Region = 7.14]
  The elevation standard deviation is 101.3 m ( 332.3 ft ) [% in USA = 55.90, % in Region = 18.57]
  The coefficient of variation is 28.0 %.
  The vertical relief is 484.3 m ( 1588.9 ft ) [% in USA = 52.68, % in Region = 17.14]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	217.7	263.4	277.8	293.0	309.7	327.5	352.0	388.6	443.2	522.0	702.0
  feet	714.2	864.2	911.4	961.3	1016.1	1074.5	1154.8	1274.9	1454.1	1712.6	2303.1

  

  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	233.3	145.0	0.057	0.092	38.80	91.43
  Intermittent Shoreline	13.2	8.2	0.003	0.005	71.15	35.71
  Perennial Streams	288.1	179.1	0.071	0.113	20.75	78.57
  Intermittent Streams	1259.8	783.0	0.308	0.496	46.47	21.43
  Canals	159.2	98.9	0.039	0.063	81.81	88.57
  1° roads	0.5	0.3	0.000	0.000	34.44	61.43
  2° roads	172.0	106.9	0.042	0.068	74.09	92.86
  3° roads	58.3	36.2	0.014	0.023	15.54	30.00
  4° roads	5918.1	3678.1	1.449	2.331	75.27	92.86
  Total Roads	6148.8	3821.5	1.505	2.422	68.78	92.86
  Railroads	146.4	91.0	0.036	0.058	44.72	88.57
  Pipes and Powerlines	130.5	81.1	0.032	0.051	53.48	84.29

  
  Of the natural water in this HUC, 70.94% (by length) is intermittent [% in USA = 70.72, % in Region = 15.71]

  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