Geoscience Reference
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Table 5.7 Major landslide events and antecedent cumulative rainfall
Landslide events
location
1 day
2 day
3 day
4 day
5 day
Tindharia and gaya-
bari and mahanadi
110 mm
211.3 mm
265 mm
305 mm
340 mm
2nd July,
1993
3rd July,
1993
(Landslide)
Chunabhati, tidharia,
paglajhora, mahanadi
(along NH-55),
jogmaya
150
390
450
485
520
6th July,
1998
7th July
(Landslide)
8th July
(Landslide)
Gayabari T.E., Along
NH-55, tindharia and
shiviter. paglajhora
197 mm
500 mm
527
565
590
8th July,
2003
9th July,
2003
(Landslide)
Tindharia and upper
and lower paglajhora
124.5
224.5
255.5
300
315
17th July,
2007
18th July,
2007
(Landslide)
Tindharia, lower pag-
lajhora and shiviter
91 mm
187 mm
275 mm
6th Sep-
tember
2007
7th Sep-
tember
2007
8th Sep-
tember
2007
(Landslide)
14 Mile near lower
paglajhora, nurbong,
gitingia, shiviter
111.7 mm
15th June,
2010
345 mm
16th June,
2010
(Landslide)
245
295
365
5.3.3 Calculated Critical Height to Initiate Slide
The determined critical slope height after Culmann ( 1866 ) at Tindharia and Lower
Paglajhora are 5.89 and 7.80 m respectively. The height of the vertical back wall
along the road should be restricted to almost 5.89 m at both the places (Table 5.8 )in
Tindharia. The landslide affected area with more than 5.89 m height corresponding
to the average threshold slope angle of 24
ed and shaped to that of
safe height (below 5.89 m.). At Paglajhora, the critical height for slope failure is
7.80 m.
°
must be identi
5.3.4 Temporal Probability of Landslide Events
The occurrences of major landslide events with more than 90 % certainty could be
expected in every 7.5 years in case of Poisson distribution model. If we consider
landslide event, then we can say that it can be expected in every 13 years with
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