Los Angeles -- Cataloging Unit 18070105

• Ventura-San Gabriel Coastal Accounting Unit 180701
  
• 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 2169.0 km² ( 837.8 mi² ) [% in USA = 24.77, % in Region = 51.85]
  The area from the USGS is 819 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 3471)

  IV. Elevation Analysis

  This analysis is based on 866277 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 527.3 m ( 1730.0 ft ) [% in USA = 57.79, % in Region = 39.26]
  The elevation standard deviation is 487.2 m ( 1598.4 ft ) [% in USA = 96.40, % in Region = 77.78]
  The coefficient of variation is 92.4 %.
  The vertical relief is 2159.4 m ( 7084.6 ft ) [% in USA = 91.05, % in Region = 62.22]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	42.0	121.8	207.3	248.7	306.1	430.6	670.7	1014.3	1332.5	2159.4
  feet	0.0	137.8	399.6	680.1	815.9	1004.3	1412.7	2200.4	3327.7	4371.7	7084.6

  

  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	252.1	156.7	0.116	0.187	61.72	68.15
  Intermittent Shoreline	0.0	0.0	0.000	0.000	27.19	34.07
  Perennial Streams	476.2	296.0	0.220	0.353	43.15	43.70
  Intermittent Streams	11.1	6.9	0.005	0.008	4.88	8.15
  Canals	3.7	2.3	0.002	0.003	49.31	31.85
  1° roads	744.0	462.4	0.343	0.552	99.91	100.00
  2° roads	23.9	14.9	0.011	0.018	28.75	85.93
  3° roads	114.0	70.9	0.053	0.085	48.84	57.78
  4° roads	13235.0	8225.6	6.102	9.818	99.67	98.52
  Total Roads	14117.0	8773.8	6.508	10.472	99.67	98.52
  Railroads	453.0	281.6	0.209	0.336	98.11	99.26
  Pipes and Powerlines	16.7	10.4	0.008	0.012	21.03	31.11

  
  Of the natural water in this HUC, 1.50% (by length) is intermittent [% in USA = 6.16, % in Region = 7.41]

  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