nition of
the
ikely to Table l. Key to landforms and their susceptibility to landslides
esent or (12, Chapter 3).
. that
condi- Landform or Landslide
the fact Topography Geologic Materials Potential?
the next I. Level terrain
ld not A. Not #levatad Floodplain 3
B. Elevate
« slide 1. Uniform tones Terrace, lake bed 2
owing the 2. Surface irregularities, sharp cliff Basaltic plateau 1
from the 3. Interbedded-porous over impervious layers Lake bed, coastal plain,
srative sedimentary plateau 1
II. Hilly terrain
ected. A. Surface drainage not well integrated
1. Disconnected drainage Limestone 3
lelin- 2. Deranged drainage, overlapping hills, asso-
; ciated with lakes and swamps (glaciated
nensional areas only) Moraine 2
raphy, B. Surface drainage well integrated
ties on l. Parallel ridges
3 at a. Parallel drainage, dark tones Basaltic hills 1
b. Trellis drainage, ridge-and-valley topog-
ates and raphy, banded hills Tilted sedimentary rocks 1
ind scales c. Pinnate drainage, vertical-sided gullies Loess 2
Frared, 2. Branching ridges, hilltops at common elevation
EM a. Pinnate drainage, vertical-sided gullies Loess 2
-lon as b. Dendritic drainage
for (1) Banding on slope Flat-lying sedimentary
rocks 2
(2) No banding on slope
: (a) Moderately to highly dissected
using ridges, uniform slopes Clay shale 3
mmended (b) Low ridges, associated with coastal
ig with features Dissected coastal plain 1
(c) Winding ridges connecting conical
imall- hills, sparse vegetation Serpentine 1
analysis 3. Random ridges or hills
- to a. Dendritic drainage
(1) Low, rounded hills, meandering streams Clay shale I
> present (2) Winding ridges connecting conical hills,
study of sparse vegetation Serpentine 1
| search (3) Massive, uniform, rounded to A-shaped
. hills Granite 2
ie analysis (4) Bumpy topography (glaciated areas only) Moraine 2
fe III. Level to hilly, transitional terrain
| the A. Steep slopes Talus, colluvium 1
'ogress B. Moderate to flat slopes Fan, delta 3
C. Hummocky slopes with scarp at head Old slide 1
*1-susceptible to landslides;2=susceptible to landslides under certain conditions; and 3= not
susceptible to landslides except in vulnerable locations.
