Liberty Bayou-Tchefuncta -- Cataloging Unit 08090201

• Lake Pontchartrain Accounting Unit 080902
  
• Lower Mississippi Subregion 0809
  
• Lower Mississippi Region 08 (There are 82 cataloging units in this region.)
  The state composition by area is 100.0% Louisiana.
  

  I. Graphical Locater Maps

  Roads

  Water Only

  8 Digit HUCs

  The area of this HUC in these maps is 1812.4 km² ( 700.1 mi² ) [% in USA = 14.35, % in Region = 19.51]
  The area from the USGS is 708 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 794)

  IV. Elevation Analysis

  This analysis is based on 724246 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 21.6 m ( 70.9 ft ) [% in USA = 5.16, % in Region = 24.39]
  The elevation standard deviation is 20.7 m ( 67.9 ft ) [% in USA = 11.84, % in Region = 60.98]
  The coefficient of variation is 95.8 %.
  The vertical relief is 109.0 m ( 357.6 ft ) [% in USA = 10.00, % in Region = 50.00]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	0.0	3.0	6.0	7.0	9.0	12.0	17.4	30.0	44.0	58.3	109.0
  feet	0.0	9.8	19.7	23.0	29.5	39.4	57.1	98.4	144.4	191.3	357.6

  

  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	387.8	241.0	0.214	0.344	82.38	62.20
  Intermittent Shoreline	0.0	0.0	0.000	0.000	26.95	30.49
  Perennial Streams	618.6	384.5	0.341	0.549	63.10	54.88
  Intermittent Streams	711.8	442.4	0.393	0.632	57.03	50.00
  Canals	97.5	60.6	0.054	0.087	86.17	54.88
  1° roads	90.1	56.0	0.050	0.080	89.48	93.90
  2° roads	79.2	49.3	0.044	0.070	75.70	68.29
  3° roads	429.4	266.9	0.237	0.381	95.41	87.80
  4° roads	3600.9	2238.0	1.987	3.197	92.37	98.78
  Total Roads	4199.7	2610.1	2.317	3.728	93.27	98.78
  Railroads	112.4	69.9	0.062	0.100	68.55	65.85
  Pipes and Powerlines	142.7	88.7	0.079	0.127	88.49	86.59

  
  Of the natural water in this HUC, 41.43% (by length) is intermittent [% in USA = 44.58, % in Region = 50.00]

  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