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Technical Report ACKNOWLEDGEMENT The Detailed Project Report of Thaiba-Damaitar-Godamchaur Road (DRCN Code No: 25DR006) Rehabilitation & Reconstruction Road Project (Km 0+000 to Km 2+656), Lalitpur district under ADB funded Earthquake Emergency Assistance Project (ADBLoan No. 3260 – NEP), which aims to accelerate the recovery and reconstruction of the rural roads damaged by earthquake. This main report is a part of the assignment as per contract between Central Implementation Support Consultants, DRILP-AF, Lalitpur, Nepal as the Client and JV of BEAM/CEMECA/ Digicon, Kathmandu as consultant. We take this opportunity to express our gratitude to MOFALD, EEAP, the Central Level Project Implementation Unit, Lalitpur, Nepal and officials of DoLIDAR, DDC and DTO. We are also very much grateful to the contribution of all the individuals who were directly or indirectly involved in this project works for their kind co-operation and help at every step in the process for the completing the assignment. JV of BEAM Consultants Pvt. Ltd., Cemeca Consultant Pvt. Ltd. Digicon Engineering Consult Pvt.Ltd Kathmandu, Nepal 1 EXECUTIVE SUMMARY The detailed engineering survey, design and cost estimate for rehabilitation and reconstruction of Thaiba - Damaitar -Godamchaur Road of Lalitpur district, Nepal has been prepared for ADB funded Emergency Earthquake Assistance Project (ADB Loan 3260-NEP). The road length is 2.656km.The road alignment starts from Thaiba of Godavari Municipality and ends at Godamchaur of Godavari Municipality .The road passes through only one Municipality i.e. Godavari Municipality and three settlements namely Thaiba, Damaitar and Godamchaur. Design of the road was carried out by SW_ROAD 2006 and SW_DTM 2006 computer software developed by SOFTWEL (P) Ltd, Nepal. Design was carried out using strip survey method, so that alignment could be optimized as per requirement. Nepal Rural Road Standard (2055) with 2nd Revision, DoLIDAR is followed to design the road. The road falls under the category of District Road Core Network as per NRRS as it connects village and district headquarters as well as SRN. And accordingly, the design parameters and standards are considered for the road design. A total right of adopted is 20m (10 m on either side). Adopted Roadway width is 5.25 m which includes carriageway and its shoulder width and formation width is 6.25m including drain. DoLIDAR and DoR Guidelines is adopted to design the retaining structures as appropriate. The retaining structures include gabion retaining wall, stone masonry retaining wall, RCC cantilever retaining wall and dry stone masonry wall. The road alignment passes through settlements, agricultural land and forest area. The average width of the existing road is 4 m. Though the right of way is 10m on either side from road centerline it is proposed to acquire only 5m on both side from the centre of the road for the carriageway, shoulder, side drains and passing bays. However, in the built up area even this may not be feasible accordingly in such areas only minimum required land has been proposed for acquisition. It is proposed that additionally only 1.5 m on each side from centre the alignment of the road be acquired to avoid the demolition of RCC buildings, temples and schools. The pavement design for bituminous road is based on DOR pavement design guidelines for flexible pavement. As per DoR Pavement Design Guidelines (Flexible Pavement) - 2013 based on CBR Value 9.74% and traffic loading 1.59 MSA, total Pavement thickness is computed as 350 mm. Accordingly, 175 mm thick gravel sub-base, 150 mm thick gravel base and 30 mm thick premix carpet as bituminous surfacing . In addition, concrete pavement of 200 mm thick above 175 mm thick subbase is proposed in the section of road from Chainage 0+610 to Chainage 0+930. 2 The road alignment passes through slightly limestone, colluvial and residual soil deposits. A few cut slope failures were observed along the road alignment. There is a landslide prone section from Chainage 1+360 to Chainage 1+410 along the alignment. In this section, bioengineering works have been proposed along with retaining wall to stabilize the area. The total cost of bioengineering works is estimated to be NRs. 565,443.25. Regarding construction materials, stone and aggregates required for road works can be procured from Crusher Plant that is available at Thaiba (Starting Point of the proposed road). Other construction materials such as GI wire, cement, reinforcement, Hume pipes can be procured from Satdobato, Lalitpur which is 4.5 km away from Thaiba. The cost estimates are based on applicable DoLIDAR norms. In cases where DoLIDAR norms are not available, DOR norms have been used. The unit item rates for each item have been calculated on the basis of approved district rate for fiscal year 2072/73. While calculating item rates, it is assumed that a qualified contractor will undertake construction following mechanized approach for road works. It is envisaged that a construction period of 12 months will be appropriate giving due consideration to the volume of works. The base cost of civil works has been estimated to be NRs.53,396,810.3.The total cost for rehabilitation and reconstruction to gravel standard including contingencies and VAT as per GON rules is calculated to be NRs. 65,838,267.07. The per km cost including Base cost and VAT is NRs. 22,712,382.08. It is envisaged that the construction works can be completed within 12 months from award of contract and estimates are based on it. For budgetary purpose to take account of change in scope in accordance with GON financial rules a provision of 10% of the base cost estimate has been indicated in the budgetary cost estimate. 3 Table of Contents ACKNOWLEDGEMENT ............................................................................................................................................ 1 EXECUTIVE SUMMARY ........................................................................................................................................... 2 List of Figures ......................................................................................................................................................... 7 List of Tables .......................................................................................................................................................... 7 SALIENT FEATURES ................................................................................................................................................ 8 ACRONYMS ............................................................................................................................................................ 9 1 INTRODUCTION ................................................................................................................................... 12 1.1 GENERAL ................................................................................................................................... 12 1.2 PROJECT BACKGROUND ........................................................................................................ 12 1.3 GENERAL FEATURES OF THE DISTRICT AND SUB PROJECT AREA ................................. 12 1.4 SCOPE OF THE WORK ............................................................................................................. 13 2 ENGINEERING SURVEY AND STUDY ..................................................................................................... 14 2.1 DESK STUDY ............................................................................................................................. 14 2.2 Working Team ............................................................................................................................. 14 2.3 Pre – Survey Activities ................................................................................................................ 14 2.4 TOPOGRAPHICAL SURVEY ..................................................................................................... 14 2.5 GEOLOGICAL OBSERVATION ................................................................................................. 15 2.6 SOIL TYPE ALONG THE ROAD ALIGNMENT .......................................................................... 18 2.7 LANDSLIDES AND SLOPE STABILITY ..................................................................................... 18 2.8 VEGETATION SURVEY ............................................................................................................. 19 2.9 MATERIAL SURVEY .................................................................................................................. 19 2.10 GENERAL INVENTORY ............................................................................................................. 19 2.11 DATA ENTRY AND ANALYSIS .................................................................................................. 19 2.12 GENERAL ALIGNMENT ............................................................................................................. 20 2.13 LAND USE PATTERN ALONG THE ROAD ............................................................................. 20 3 ROAD CORRIDOR COMMUNITY PROFILE .................................................... Error! Bookmark not defined. 3.1 ZONE OF INFLUENCE .............................................................................................................. 21 3.2 OCCUPATION OF PEOPLE .....................................................................................................
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