Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
CHAPTER 2: PROJECT DESCRIPTION
2.1 Introduction
The existing Lunglei - Tlabung Road was originally constructed as ODR Standard road during the early part of seventies. It was constructed by the BRO .The road was constructed to provide connectivity between district headquarters and International boarder of Indo Bangladesh for international trading but also for western part of Mizoram. The total length of the road in Mizoram is 98.00 km. The road was upgraded to the status of State road and International trading route between India and Bangladesh in the year 2005. No substantial improvement of the road other than normal renewal works have been carried out since the road was declared an International trade route. The pavement work and the permanent works of retaining wall and cross drainage structures were done at the time of construction as an ODR standard road and the width of the cross drainage structures are also only 7.50 m. Most of the retaining wall / wing wall had been collapsed and the road formation width also breaches at many stretches.
Existing road take off from Km 4.5 of NH 54 A passes through the villages and terminate at River Sazuk Lui (km 98.0) , Indo Bangladesh Boarder and this road passes through nine villages, i.e. Lunglei ,Hauruang ,Pachang ,Phairuang ,Rotlang,Lungsen,Sihphir,Tuichawng & Tlabung and Kawrpuichhuah. .
2.2 Project Road
The initial stretch of the Lunglei-Tlabung road passes through heavily built-up areas which involve costly of Land Acquisition and serious resettlement problems in the existing road. The existing alignment also passes through steep terrains which are unstable and landslide prone area at many locations which could also posed serious problems in future. Due to these reasons, it was felt absolutely necessary to re-align the existing initial stretch of the Lunglei-Tlabung road between km 0/00 –7/00 by shifting the existing take-off point at km 1-1 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
4/500 to a proposed new take-off point at km 3/700 (i.e. located at out skirt of Lunglei town) on NH 54A . The proposed alignment also realigned at the existing road from Km 12/00 to Km 14/80, Km52/45 to Km 55.15 , Km 70.95 to 72.88 and Km 85/00 to Km 98/00 to bye pass the habitant and heavily built-up areas of the villages viz, Haurung village,Lungsen village ,Tuichawng Village and Tlabung The proposed realignment take off points are very near due to which ,it will not effected and deprived the connectivity with villages and hence, the villagers would be the beneficiaries with the proposed alignment. Therefore, the proposed re-alignment does not pass through heavily built-up area and would involve much less L.A cost as well as resettlement problem as compared to the existing alignment. The re-alignment also passes through an area with a much better topographical as well as soil conditions.
2.3 Salient features based on design are as below:
Length of Project Road Sector Km 87.352
The road has a ROW of 24 m.
The formation width is 12 m.
The Highway is designed for 2-lane carriageway of 7.0 m width.
The Highway is designed with flexible pavement
Pave shoulders of 2.50m is provided both sides.
All structures are matching to two lane NH roadway standard.
Route Alignment: take off from Km 4.5 of NH 54 A passes through the villages and Terminate at km 98.0 on River Sazuk Lui Indo Bangladesh Boarder
Drains: Lined Drain.
Landslide : Minor
Junction – 5 Nos., Major Junction – 4 Nos & Minor Junction – 1 Nos
1-2 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
2.3 Need of the project
Initially this road was constructed by BRO and maintained by PWD, Mizoram. It was constructed during insurgency period in the state. The whole work was executed on urgent basis due to security reason. Due to this reason, the gradient of the road are generally very steep and sharp curves. However, in spite of the poor condition of this road, it remains the most important lifeline for the people in the South western belt of Mizoram.
Although this road has been categorized as State road (SH) by PWD, Government of Mizoram but substantial improvement of the road other than normal renewal works have been carried out since the road was declared an International trade route. Most of the retaining wall / wing wall had been collapsed and the road formation width also breaches at many stretches. The existing road has steep gradient and sharp curves / zigs at various stretches.
Hence is very essential to improve & up-grade existing road conforming to 2-lane standard.
2.4 Expected benefit from the project
The road will provide better connectivity between district headquarters and International boarder of Indo Bangladesh for international trading but also for western part of Mizoram
Improve quality of life of the people living along the road in the region
Improve quality of life of the people in the region
2.5 Alignment improvement
The general alignment of the road under this project is as:
1-3 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
Sr.No. Location Name Existing alignment Realignment
1 Lunglei ( Take off point Km 0.000 to 7.000
2 Km 7.00 to Km 12.00
3 Hauruang Village Km 12.00 to Km 15.00
4 Km 15.00 to Km 52.45
5 Lungsen Village Km 52.45 to Km 56.20
6 Km 56.20 to Km 70.95
7 Tuichawng Village Km 70.95 to Km 73.65
8 Km 73.65 to Km 85.00
9 Tlabung Village Km 85.00 to 99.80
Existing alignment : 68.55 Km
Re-alignment : 31.25 Km
Road is designed for 2-Lane (12.00 m roadway with 7.00 m carriageway).
Gradient, being the most important parameter, has been the guiding factor. Ruling gradient (less than 5.0%) has been achieved the maximum gradient being 5.4%.
Alignment options
Two (2) alignment options have been studies. The details of each option is given below
Sl..No. Alignment Alignment Remarks
1-4 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
Option-1 Option-2
1 Branch off from Branch- off from Shifting the existing take-off Km 4.5 of NH 54 Km 3.5 of NH 54 point & realignment of existing A at Theiriat A at Theiriat between km 0/00 – 7/00 by due to heavily built-up areas which involve costly of Land Acquisition and serious resettlement problems in the existing road Electric sub-station is the bottle neck for this project. Land acquisition, shifting of substation is not possible.
2 Km 7.00 to Km Km 7.00 to Km Short relocation and regarding 12.00 followed up 12.00 followed up the existing the existing alignment alignment
3 Km 12.00 to Km Km 12.00 to Km Road passing through Hauruang 15.00 followed up 15.00 Proposed village is avoided, thereby the existing realignment to bye economizing the cost of the land alignment pass the Hauruang acquisition. Village . Hauruang village continues to maintain its connectivity through the existing road Sharp Zigs on the existing road have been avoided The accident prone areas in and around Hauruang village have been avoided Ruling gradient has been achieved.
1-5 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
It does not have zigs and hair- pin bends. To avoid the sinking portion of road with the town area.
4 From Km 15.00 to From Km 15.00 to Short relocation and regarding Km 52.45 Km 52.45 followed followed up the up the existing existing alignment alignment
5 From Km 52.45 to From Km 52.45 to Road passing through Lungsen Km 56.20 followed Km 56.20 Proposed village is avoided, thereby up the existing realignment to bye economizing the cost of the land alignment pass the Lungsen acquisition. Village Lungsen village continues to maintain its connectivity through the existing road Sharp Zigs on the existing road have been avoided The accident prone areas in and around Lungsen village have been avoided Ruling gradient has been achieved. It does not have zigs and hair- pin bends. To avoid the sinking portion of road with the town area.
6 From Km 56.20 to From Km 56.20 to Short relocation and regarding Km 70.95 followed Km 70.95 followed
1-6 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
up the existing up the existing alignment alignment
7 From Km 70.95 to From Km 70.95 to Road passing through Km 73.65 followed Km 73.65 Tuichawng Village is avoided, up the existing Proposed thereby economizing the cost of alignment realignment to bye the land acquisition. pass the Tuichawng Tuichawng Village continues to Village maintain its connectivity through the existing road Sharp Zigs on the existing road have been avoided The accident prone areas in and around Tuichawng Village have been avoided Ruling gradient has been achieved. It does not have zigs and hair- pin bends. To avoid the sinking portion of road with the town area.
8 From Km 73.65 to From Km 73.65 to Short relocation and regarding Km 85.00 followed Km 85.00 followed up the existing up the existing alignment alignment
9 From Km 85.00 From Km 85.00 Road passing through Tlabung is to Km 98.00 to Km 99.80 avoided, thereby economizing followed up the Proposed the cost of the land acquisition. existing alignment realignment to bye Tlabung Village continues to pass the Tlabung maintain its connectivity through
1-7 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
Village the existing road Sharp Zigs on the existing road have been avoided The accident prone areas in and around Tlabung Village have been avoided Ruling gradient has been achieved. It does not have zigs and hair- pin bends. To avoid the sinking portion of road with the town area.
10 Length of Length of alignment = 98.00 alignment = Km 87.352Km
11 Nos of bridge = 7 Nos of bridge = 12
12 Nos of Cross Nos of Cross drainage =540 drainage =545
2.6 Drainage
Pavement Drainage includes camber / cross fall of 2.5%.
Slope 3.5% has been considered for drainage of shoulders.
Roadside drains are designed: Lined drains in case of soils and soft rock and Unlined drains in case of rock-cut areas.
1-8 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
Chutes of the culverts form part of the culvert structure to lead the discharge to the catch- pit or to natural drainage channel.
2.7 Side Drains The major stretch of project road is in full cutting and part filling at certain locations. Longitudinal side drains (lined) have been proposed on the side of hill cutting all throughout the length except for cross drainage and bridges. Besides longitudinal drains, it is proposed to provide chutes at different location as per site conditions. 2.8 Culverts
The project road traverses through mountainous and steep terrains with several natural drainages such as deep gorges, depressions, etc., where perennial water and rain water runoff are collected. Sometimes the storm runoff is accompanied by large quantities of debris from upstream side of the nallahs. Cross-drainage structures/culverts are required at these locations. From the field survey and investigations and geometric design of alignment the requirement of culverts for the whole length of the project have been identified. Details of culvert locations are given in Annexure 2
2.9 Slope Protection works
Adequate Protective structures are proposed for retaining of cut/fill slopes to ensure stability of the road formation at locations where required. In the proposed improvement 6260m of retaining wall, 1385m of breast wall, 3010m of gabion wall and 1650m of toe wall have been proposed as slope protection measures. Details of protection works location are given in annexure 1. In addition to these bioengineering measures will be provided for protection of embankments, disposal sites and hill side and valley side slopes.
1-9 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
2.10 Seismic Effects
As the project area is in zone –V of the seismic zone classification i.e. high earth quack prone area. Hence design of structures has been done considering the following - . Basic horizontal seismic co-efficient - As per zone . Importance Factor : 1.5
Reinforcement detailing of structures shall conform to the provisions of IS 13920
2.11 Source of Rock and Material
The rock deposits are available along or the vicinity of the project road alignment. Besides, cobbles, pebbles and sand deposits are available in the rivers or streams crossing the main alignment
Major constructional materials such as Bitumen, Cement, Steel and POL etc., will be taken through NH-54 from outside the state mostly from Assam state.
2.12 Excavated spoil
It has been estimated that due to construction of the road about 8.4 million M3 of spoil will generate, out of which soil will be 4.5 million M3, soft rock will be 3.4 million M3 and hard rock will be 0.3 million M3.
Provision will be made in contract to reuse the spoil for different purposes to minimise the disposable spoil.
2.13 Disposal of spoil
It has been stated that 8.4 million M3 of spoil will generate due to up gradation of the existing road, which about 0.1 million M3 per km. Disposal of such a huge quantity of earth spoil is a difficult task. Design consultant has identified some disposal sites, which are not sufficient. More potential disposal sites are to be identified in consultation with local people. Provision will be made in the contract that contractor will dump the spoil in the designated disposal sites and also will take proper engineering and bioengineering measure to manage the site and conserve the spoil.
1-10 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
2.13 Blasting of rock
Geological and geo- technical investigation indicate the fact that during widening of the road proposed road alignment will pass through hard rock areas . To widen the road in these stretches need blasting. Provision will be made in the contract that all blasting will be controlled blasting and Environment Health and safety guideline provided in the EMP will be implemented.
2.14 Water for construction
It has been estimated that water requirement for construction of the road and for worker’s camp will be 850 KL/day. The contractor will arrange the water for construction. Provision will be made in the contract that contractor will select the water source as per the guideline provided in the contract and EMP.
2.15 Project cost
The total cost of the project is Rs 670.84 Crores which covers costs for formation work, Slope protection and cross drainage works, construction of bridges and pavement works..
2.7 OVERVIEW OF BENEFITS DUE TO THE PROJECT
The road project is expected to bring positive benefits for the users and communities along the project corridors.
Macro-economic Benefits: The socio-economic and commercial/tourism development will get a boost from improved accessibility of agricultural products to markets, reduce cost of transportation for goods and people, reduce vehicle operating costs, reduce fuel consumption and reduce accident costs through improved safety and better driving conditions.
Accident Reduction: Increased level of road safety will be another benefit. Road accidents are due to bad geometry, poor road surface, obstruction to sight lines especially at junctions
1-11 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
and at settlements. Since direct and indirect accident costs are substantial, the project will bring in substantial benefits.
Community Facilities: The project roads will be provided with public amenities like covered bus shelters with toilets. New sites will be reclaimed through dumping of excavated materials. Abandoned workers’ camps/contractors camp sites can be re-used and water- harvesting structures reverted to community for its use.
Employment Generation: The project has the potential to generate direct employment in road construction and maintenance works. The contractors are encouraged to consider employing local persons. Under the social forestry programme, scope exists to undertake horticulture as an income generating activity.
Environmental Benefits: The environmental benefits generated by the project are:
Measures to conserve and protect biodiversity and Ecological identity areas
Afforestation (Ten trees will be planted against each tree lost), will contribute to revegetate degraded forests.
Recycling of debris and surplus excavated material for creating new sites for development and preventing negative impacts of indiscriminate dumping.
Introduction of “environment sensitised” construction technology, plant and machinery.
Improved drainage
Reduction in landslide and soil erosion.
Landscaping and environmental integration of the project in the surrounding areas will improve aesthetics.
Apart from these environmental benefits, there would be nonetheless, potential for certain negative social and environmental impacts due to the project. The EA/SA process has recognized this since the start of the project and has sought to address these issues prior to the finalisation of the design. Wherever the avoidance of these impacts is not possible, mitigation measures have been worked out. The Environmental Management Plan and Resettlement and Indigenous Peoples Development Plan for the upgradation route and the Environmental and Social Management Plan for major maintenance routes will form the basis of mitigation/compensatory measures in this regard. 1-12 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
The Government of Mizoram is committed to the complete and comprehensive implementation of all measures designed during the project preparation stage to reduce these negative impacts and enhance the benefits of the project.
1-13 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
Project road
1-14 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
Existing alignment of Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830) on Google
1-15 PWD, Mizoram Mizoram State Road Project –II
Lunglei – Tlabung-Kawrpuichhuah Road (km 0.0 to km 87.830)
Alignment of Lunglei – Tlabung- Kawrpuichhuah Road (km 0.0 to km 87.830) on SOI Toposheet
1-16 PWD, Mizoram
PWD 2-1