Buchanan-Lyndon B -- Cataloging Unit 12090201

• Middle Colorado-Llano Accounting Unit 120902
  
• Lower Colorado-San Bernard Coastal Subregion 1209
  
• Texas-Gulf Region 12 (There are 122 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 3286.5 km² ( 1269.5 mi² ) [% in USA = 52.16, % in Region = 46.72]
  The area from the USGS is 1260 mi².
  

  II. Flow Connections (upstream and downstream units)

  III. Named places in this watershed (total = 855)

  IV. Elevation Analysis

  This analysis is based on 1312315 elevations on a 50 m grid within the area of this HUC.
  The mean elevation is 412.7 m ( 1354.0 ft ) [% in USA = 51.02, % in Region = 70.49]
  The elevation standard deviation is 79.2 m ( 259.8 ft ) [% in USA = 50.36, % in Region = 77.87]
  The coefficient of variation is 19.2 %.
  The vertical relief is 464.2 m ( 1522.9 ft ) [% in USA = 51.82, % in Region = 87.70]

  Elevation Percentiles

  	0 %	10 %	20 %	30 %	40 %	50 %	60 %	70 %	80 %	90 %	100 %
  meters	210.0	310.0	339.4	368.4	395.8	417.1	427.6	452.5	464.2	508.2	674.2
  feet	689.0	1017.0	1113.5	1208.6	1298.5	1368.4	1402.9	1484.6	1522.9	1667.3	2211.9

  

  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	501.2	311.5	0.152	0.245	72.71	72.95
  Intermittent Shoreline	7.9	4.9	0.002	0.004	66.79	47.54
  Perennial Streams	440.0	273.5	0.134	0.215	29.99	53.28
  Intermittent Streams	1290.7	802.2	0.393	0.632	56.99	64.75
  Canals	0.0	0.0	0.000	0.000	35.62	41.80
  1° roads	0.0	0.0	0.000	0.000	30.84	10.66
  2° roads	50.5	31.4	0.015	0.025	35.43	19.67
  3° roads	90.4	56.2	0.028	0.044	28.33	32.79
  4° roads	3999.8	2485.9	1.217	1.958	55.42	14.75
  Total Roads	4140.7	2573.5	1.260	2.027	47.99	11.48
  Railroads	63.9	39.7	0.019	0.031	29.51	24.59
  Pipes and Powerlines	190.0	118.1	0.058	0.093	77.03	77.87

  
  Of the natural water in this HUC, 57.98% (by length) is intermittent [% in USA = 58.69, % in Region = 45.08]

  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