Santa Margarita -- Cataloging Unit 18070302

• 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 1889.8 km² ( 730.0 mi² ) [% in USA = 16.67, % in Region = 40.74]
  The area from the USGS is 731 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 396)

  IV. Elevation Analysis

  This analysis is based on 756020 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 713.0 m ( 2339.2 ft ) [% in USA = 64.57, % in Region = 51.11]
  The elevation standard deviation is 389.3 m ( 1277.2 ft ) [% in USA = 90.67, % in Region = 59.26]
  The coefficient of variation is 54.6 %.
  The vertical relief is 2250.1 m ( 7382.1 ft ) [% in USA = 92.75, % in Region = 65.93]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	304.0	373.3	432.9	498.0	609.0	730.7	942.4	1139.6	1280.0	2250.1
  feet	0.0	997.4	1224.7	1420.3	1633.8	1998.0	2397.3	3091.8	3738.8	4199.4	7382.1

  

  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	77.2	48.0	0.041	0.066	31.98	35.56
  Intermittent Shoreline	2.5	1.5	0.001	0.002	57.70	57.78
  Perennial Streams	470.0	292.1	0.249	0.400	48.13	47.41
  Intermittent Streams	1133.0	704.1	0.600	0.965	80.34	82.22
  Canals	38.0	23.6	0.020	0.032	73.66	60.74
  1° roads	55.9	34.7	0.030	0.048	79.39	69.63
  2° roads	0.0	0.0	0.000	0.000	15.35	73.33
  3° roads	104.4	64.9	0.055	0.089	51.16	62.96
  4° roads	3605.4	2240.8	1.908	3.070	91.52	80.00
  Total Roads	3765.7	2340.4	1.993	3.206	89.01	80.00
  Railroads	28.0	17.4	0.015	0.024	24.49	41.48
  Pipes and Powerlines	0.8	0.5	0.000	0.001	10.09	14.07

  
  Of the natural water in this HUC, 67.48% (by length) is intermittent [% in USA = 67.55, % in Region = 72.59]

  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