Geological and Bio-engineering Investigation of Bhalubang-Pyuthan Road

Project Description

The Bhaluwang Pyuthan Road is located in Dang and Pyuthan District of Rapti Zone in Mid Western Development Region. The road originates from Bhaluwang (27( 51’N, 82( 47’E) Km 689+000 of Mahendra Highway in Dang district and ends at Pyuthan (28(05′ N, 82(52’E) of Pyuthan district. The Ganaha (27(53’N, 82(48’E) – Chakchake (28(03′ N, 82(47′ E) sector of the road passes through Siwalik and Mahabharat range. The road under study is about 18 km from Ganaha and ends at Mandre (28(03′ N, 82(47’E) covering Siwalik and Mahabharat range of alignment, lies in Pyuthan District. This road has been constructed to a single lane feeder road having 3.5m pavement width with gravel standard up to Km 28+000 and then after to a earthen standard, by Department of Roads with solely from HMG/N resource. The right of way is 15m. The present traffic on the road is about 60 vehicles per day. The construction method employed was a combination of labour intensive and mechanised method. Several shortfall during construction can be noted on site with respect to slope cutting, soil disposal, discharging surface water which are alarming cut slope failures, formation of new landslides and gully erosion.

Assignment Description

Conducted a Geological and Bio-Engineering base line survey of the proposed road corridor • Carried out roadside investigation concentrating mainly along the road corridor as well as down to the slope up to the river and above the road corridor to the nearest ridge or stable slope. The investigation included topographical, geo-morphological, hydrological, landslide investigation, and erosion studies. • Identified and surveyed the landslide and potential landslide hazard. All source and factors contributing to the increase of landslide hazard within the road corridor to be identified measured and or surveyed. The identified primary as well as secondary sources of landslide hazards were mapped in the topo map of scale 1: 25000 and also presented in clear formats with sketches and the description of tabular form • Design of civil and bioengineering structure to protect the unstable slope and gullies of the road corridor concentrating mainly on landslides of bioengineering aspects. • Preparation of cost estimates of the proposed counter measures or mitigation