Comparatives investigation of useful life and hazard risk based on return period watershed projects with AHP approaches (Case study:Khorasan Razavi basins)

Authors
H. Zarif shirdel Parhizgar
M.R. Ekhtesasi
Abstract
One of the major issues in the construction of drainage structures should be protected in proportion
with the river type. The design flow is based on the useful life period and also takes risks plays a very
important role in selecting the location and type of structures and its design, ultimately. In this study,
the spatial distribution of watershed management structures based on river order in 13 the study watershed
is located in the province of Khorasan. Results expressed that in useful 5 year, With an acceptable hazard
risk of 25% for straw dam and Rocky dam structures, in useful 10 year with hazard risk of 20% for the
gabion, in useful 15 year with hazard risk of 15% for the cement dams and in useful 20 year with hazard
risk of 10% for earth dams Based on the analytic hierarchy process had the highest scores. While The rate
of return on plan acceptable straw dam structures Rocky dam and gabion structure to the 2x and for
cement dams and earth dams 4x values is also used in the design is‌ implemented.
Keywords
Watershed management Structure
useful life
hazard risk
Analytical Hierarchy Process (AHP)
Razavi Khorasan