SURFACE ROUGHNESS DATA ELEMENTS: DELTA, BIRDSFOOT
Irregularities
SRI: 3; Many small irregularities
Form
Long fingerlike projections existing as natural levees extend
radially from main stream; level surface
Drainage
Level surface with numerous stream channels
Color (Photo Gray Tones) Mixture of photo gray tones; light to medium gray
Land Use
Wildlife preserves
Vegetation
Marsh grasses are the main vegetation type
Soil/Rock
Wet, fine-grained soils; marshes, lakes, and lagoons
predominate
Relief
Low
Slope
Gentle to flat
Source: Terrain analysis procedural guide for surface configuration, US Army engineer
topographic laboratories, p. 7-38