1-1 PWD, Mizoram CHAPTER 2: PROJECT DESCRIPTION 2.1 Introduction the Existing Lunglei
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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.