Cottonwood-Tijuana -- Cataloging Unit 18070305

• Laguna-San Diego Coastal Accounting Unit 180703
  
• Southern California Coastal Subregion 1807
  
• California Region 18 (There are 135 cataloging units in this region.)
  The state composition by area is 100.0% California.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 1281.2 km² ( 494.9 mi² ) [% in USA = 6.63, % in Region = 27.41]
  The area from the USGS is 477 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 438)

  IV. Elevation Analysis

  This analysis is based on 512846 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 947.6 m ( 3108.9 ft ) [% in USA = 71.10, % in Region = 64.44]
  The elevation standard deviation is 416.7 m ( 1367.1 ft ) [% in USA = 92.61, % in Region = 64.44]
  The coefficient of variation is 44.0 %.
  The vertical relief is 1935.8 m ( 6351.0 ft ) [% in USA = 86.22, % in Region = 51.11]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	336.8	646.0	779.3	871.0	972.1	1061.7	1156.5	1258.1	1520.6	1935.8
  feet	0.0	1105.0	2119.4	2556.7	2857.6	3189.3	3483.2	3794.2	4127.6	4988.8	6351.0

  

  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	83.8	52.1	0.065	0.105	42.40	45.19
  Intermittent Shoreline	3.4	2.1	0.003	0.004	68.31	66.67
  Perennial Streams	205.3	127.6	0.160	0.258	33.49	27.41
  Intermittent Streams	468.7	291.3	0.366	0.589	53.20	56.30
  Canals	0.0	0.0	0.000	0.000	35.62	25.19
  1° roads	103.6	64.4	0.081	0.130	95.74	90.37
  2° roads	0.0	0.0	0.000	0.000	15.35	73.33
  3° roads	68.8	42.8	0.054	0.086	49.74	60.00
  4° roads	1606.4	998.4	1.254	2.017	59.07	53.33
  Total Roads	1778.8	1105.5	1.388	2.234	59.88	57.04
  Railroads	49.0	30.5	0.038	0.062	47.37	63.70
  Pipes and Powerlines	0.0	0.0	0.000	0.000	8.67	11.11

  
  Of the natural water in this HUC, 62.02% (by length) is intermittent [% in USA = 62.86, % in Region = 66.67]

  VI. Other sites

  • EPA- Surf Your Watershed - Index of Watershed Indicators
  • USGS- Science in Your Watershed - Selected Realtime Streamflow Stations
  • CTIC- Known Your Watershed

  ---

  1999 SEPT 4, Last updated on 2003 JAN 23
  
  D.L. Gustafson, dlg@rapid.msu.montana.edu