NSCP 2015 / ASCE 7-16 Wind Load Analysis Tools
| Parameter | Distance |
|---|---|
| Case 1 — d1 | -- |
| Case 2 — d1 | -- |
| Case 2 — d2 | -- |
| Case 2 — d1+d2 | -- |
B: Urban/suburban areas, wooded areas, or terrain with numerous closely spaced obstructions (single-family dwelling size or larger).
C: Open terrain with scattered obstructions generally less than 9.1 m (30 ft) in height.
D: Flat, unobstructed areas and water surfaces (mud flats, salt flats, ice).