Analysis of the Potential for a Hillside Collapse for a Community in Changhua County, Taiwan

Table 2

Hierarchical structure for hillside disaster-resistant communities.

Hierarchy 1: objective	Hierarchy 2: evaluation item	Hierarchy 3: factor
Hillside disaster-resistant community disaster potential analysis	A: potential^1	A-1: average hillside gradient
		A-2: debris slide potentials
		A-3: potential debris flow torrent
	B: hazard^2	B-1: major historical disasters
		B-2: total area of debris slide
		B-3: potential debris flow torrent coverage
	C: vulnerability^3	C-1: type to affect secured objects
		C-2: establishment of the hillside disaster-resistant community
		C-3: disaster prevention education or practice

¹To establish “evaluation factors for hillside disaster-resistant communities,” factors for potential are explained: A-1: average gradient (%) for various villages; A-2: possibility of debris slide being weathered soil, detritus, colluvium, or soft and broken geological avalanche or sliding; A-3: possibility of debris flow surrounding rivers. ²To establish “evaluation factors for hillside disaster-resistant communities,” factors for hazards are explained: B-1: major disasters that occurred in the community in the past years; B-2: debris slide coverage in villages; B-3: debris flow coverage surrounding rivers. ³To establish “evaluation factors for hillside disaster-resistant communities,” factors for vulnerability are explained: C-1: type of disaster that affects local people; C-2: the establishment and operation of relevant hillside disaster-resistant communities; C-3: disaster prevention education or practice in communities.