Wind Energy Resource Atlas of the United States

Table A-9 Land-surface form terrain features representative of exposed locations.

Land-Surface Form

Exposed Feature (Map Value)

Percentage(a) Area

Plains Plains 93

Plains with Hills Open Plains 79

Plains with Mountains Plains 67

Ridge Crests and Mountain Summits 10

Tablelands Tablelands, Uplands 80

Open Hills Hilltops and Uplands 27

Open Mountains Broad Valleys 80

Ridge Crests and Mountain Summits 12

Hills Hilltops and Uplands 9

Mountains Ridge Crests and Mountain Summits 3

**Table A-9 Land-surface form terrain features representative of exposed locations.**
Land-Surface Form	Exposed Feature (Map Value)	Percentage(a) Area
Plains	Plains	93
Plains with Hills	Open Plains	79
Plains with Mountains	Plains	67
Ridge Crests and Mountain Summits	10
Tablelands	Tablelands, Uplands	80
Open Hills	Hilltops and Uplands	27
Open Mountains	Broad Valleys	80
Ridge Crests and Mountain Summits	12
Hills	Hilltops and Uplands	9
Mountains	Ridge Crests and Mountain Summits	3

(a) Percentage represents an average over the land-surface forms found in a specific region. In this example the percentages are those from the Northwest region.

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