The Complete Guide to Infrastructure Projects in Mumbai

The Complete Guide to Mumbai Infrastructure Projects - 2023

In recent years, the budget allocation for crucial infrastructure sectors such as roads, bridges, and storm water drains has increased in Mumbai.

The following are few of the infrastructure developments being carried out/on the verge of being carried out across the city of Mumbai as of 2023:

Goregaon-Mulund Link Road)

The Goregaon-Mulund Link Road (GMLR) is one of the BMC's most notable initiatives. It is the fourth and most major east-west connection project planned for connecting these areas. Existing road connection from east to west on the Santacruz-Chembur Link Road (SCLR), Andheri-Ghatkopar Link Road (AGLR), and Jogeshwari-Vikhroli Link Road (JVLR) is already saturated, causing traffic congestion and negatively damaging the environment.

The GMLR envisions road access from the Western Express Highway in Goregaon to the Eastern Express Highway in Mulund. The overall length of the GMLR project is 12.2 kilometres, comprising a 4.7-kilometer underground twin tunnel under Sanjay Gandhi National Park (SGNP). The completion of the GMLR project would decongest the suburbs of Mumbai's current road network.

The overall length of the GMLR is 12.20 kilometres, including 6.3 kilometres of tunnels, 4.37 kilometres of raised flyover, and 1.53 kilometres of road at grade level. The proposal includes four stages.

The first phase involves enlarging the Road Over Bridge (ROB) at Nahur Railway station from one to four lanes with service roads. This project is anticipated to cost GMLR Rs. 202,3 crore. The project is now underway and is anticipated to be finished by May 2023.
According to the development plan for a total length of 5.30 kilometres, the second phase consists of enlarging and improving the current 30-meter-wide road on both sides along the alignment of the planned tunnel to its full width of 45.70 metres. This component costs a total of Rs. 130 crore. The project is now underway and is anticipated to be completed by December 2023.

Phase 3(A) includes the design and construction of flyovers and an elevated rotary along Goregaon-Mulund-Link Road at the junction in Goregaon, as well as an elevated rotary at the intersection of G.G. Singh Road and the GMLR at Hedgewar Junction in Mulund. This project would cost a total of 666,07 crore rupees. The project is now underway and is anticipated to be finished by January 2025.

Phase 3(B) includes twin tunnels under Sanjay Gandhi National Park (SGNP) and a box tunnel near Film City, Goregaon. The work will proceed after the conclusion of the bid procedure.

The overall length of the planned twin tunnel and box tunnel in Film City, including approaches, is 4.70 km and 1.6 km, respectively. The final diameter of the twin tunnel will be 13 metres (3+3). The distance between the two tunnels is 15 metres. At 300m c/c, the two tunnels will be joined by a cross passage. The tunnel depth will range between 20 and 160 metres.

To prevent intrusive activities, tunnelling will be performed only using a tunnel boring machine (TBM) and no shafts inside the SGNP. In the tunnels, mechanical ventilation will be supplied. The length of the project will be five years for building and ten years for operation and maintenance.

Khar Subway Road over Bridge (ROB) For East-West Connectivity

The insufficient size of the Khar subway, which connects the city's east and west, results in considerable traffic congestion during the monsoon owing to a waterlogging issue.Residents and resident organisations have requested a solution to the traffic congestion and flooding problems. In this section, there is an essential need to construct an elevated road or Road over Bridge (ROB) in order to alleviate traffic congestion. The BMC has undertaken the project of constructing an elevated road and providing east-west connection above the Khar Tube using sophisticated construction techniques to perform the job on a small footprint.

The planned route is 4,9 kilometres long and is broken into three segments. The 2.24-kilometer-long Part A of the project comprises of an entrance from Nehru Road (Santacruz East) to Khar (West), an exit from Khar (West) to the Western Express Highway (WEH) at the service road, and entry-exit ramps to and from S.V. Road. Phase B consists of a 2.15-kilometer elevated road between Bandra Terminal and Bandra Station (East) to the WEH intersection of Santacruz Chembur Link Road (SCLR). Part C is a 515-meter-long elevated route that runs from the WEH junction of the SCLR, alongside Air Force territory, and connects to Part A before the Khar subway. The width of the road will be 9 metres.

The planned elevated road above Khar Subway would have an average daily traffic capacity of about 42,500 PCUs, decongesting the subway by lowering its traffic to less than a standstill. Many environmental concerns and engineering principles were considered throughout the conception of this project in order to minimise environmental harm and maximise the public's benefit.The project is currently in the bidding phase and is anticipated to be completed within 36 months. According to USOR 2018, the overall cost of the project is around Rs. 502.5 crore.

It is being created on a design-and-build basis, allowing bidders to optimise cost and inject innovation while integrating new technology and adhering to international quality standards in the most cost-effective manner. While this is a Design-Build project, the exact construction cost will be determined by the bidders. The selected bidder must get the appropriate permissions for ROB construction.

Mumbai Coastal Road North (Phase I), Between Versova Interchange and Dahisar Interchange, and GMLR Connector, From Versova Interchange to Dahisar Interchange and GMLR Connector

The Western Railway line and arterial highways like as the Western Express Highway, Link Road, and S.V. road link Versova and Dahisar with key infrastructure. It is difficult to commute from Versova to Dahisar owing to overcrowding on local trains and longer travel times caused by traffic congestion on the roads. In order to decongest major arterial highways and minimise travel time, the BMC has launched the ambitious project of building a Coastal Road between Versova and Dahisar, which would comprise of elevated roadways and tunnels.

The alignment begins at the current Versova interchange (the conclusion of Mumbai Coastal Road Phase II) and ends at Dahisar Interchange (starting point of Mumbai Coastal Road-Phase IV). It then links to the projected Dahisar to Bhayander Coastal Road through mangroves, stream regions, and the metro depot of Metro Line No. 2A. To finish the circle and connect the southern point (Nariman Point) and western suburbs (Bandra, Andheri, etc.) with Thane and Mulund, the projected Coastal Road is linked to the forthcoming Goregaon-Mulund Link Road (GMLR). Also suggested is an elevated GMLR Connector from the Coastal Road's Mindspace Malad connection to the GMLR's beginning in Goregoan East.

Since the planned project is extensive and involves several components needing specialised knowledge, such as subterranean tunnels and bridges, it has been separated into three packages in Andheri. Package I (8.52 km) is comprised of the distance between Versova Interchange and Mindspace Malad Interchange, as well as the first section of the GMLR Connection. Package II consists of subterranean tunnels and stretches from Mindspace Malad Interchange to Charkop Interchange over a distance of 5.32 kilometres. Package III (9.8 km) is comprised of the distance between Charkop Interchange and Dahisar Interchange as well as the second half of GMLR Connection. The overall length of the road is 23.64 kilometres, of which 18.46 kilometres are coastal road and 2.32 and 2.80 kilometres are GMLR connection parts 1 and 2, respectively.

Package I will have a road width of 45 metres with 4 × 4 lanes, while packages II and III will have a road width of 36 metres with 3 x 3 lanes. Packages I, II, and III will have a road capacity of 1,100,000 PCUs per day, 90,000 PCUs per day, and 90,000 PCUs per day, respectively. On this route, the BMC has suggested contemporary amenities like as multi-level road interchanges to alleviate traffic congestion, provision for open gantry, etc., making it an engineering wonder. Many environmental concerns and engineering principles were considered throughout the conception of this project in order to minimise environmental harm and maximise the public's benefit. It would reduce traffic congestion in Mumbai and provide commuters with pollution-free mobility.

The project is now in the bidding phase and completion is anticipated within 42 months. According to USOR 2018, the entire cost of the project is around Rs. 14,407 crore, with packages I, II, and III costing Rs. 5153 crore, Rs. 4265 crore, and Rs. 4989 crore, respectively. It is being created on a 'Design and Build' (D&B) basis, offering bidders the freedom to optimise cost and inject creativity with the use of new technology, while adhering to international quality standards.

Since this is a D&B project, the exact construction cost will be determined by the bidders. The winning bidder will be required to get all relevant approvals from different agencies, including CRZ, MCZMA, MMB, MMRDA, Saltpan Commissioner, Wildlife Clearance, Forest clearance from Forest Department/ MoEF&CC, etc.

Vidyavihar Road Over Bridge (ROB)

The BMC has commissioned the building of a Road Over Bridge (ROB) near Vidyavihar Train Station, linking LBS Marg to RC Marg in N ward. To upgrade the current road network, the Government of Maharashtra launched the creation of a master plan for integrated road development in Mumbai. In order to enhance traffic flow near Vidyavihar railway station, it was suggested to construct a railway overpass at Vidyavihar railway station to alleviate traffic congestion and provide relief to Kurla Terminal. By linking LBS Marg to RC Marg in the N ward, this would enhance east-west traffic flow and reduce travel time and distance.

The design, drawings, and bid papers for the project have been created by M/s TPF Engineering Pvt. Ltd., design consultants. The Central Railway and IIT Bombay approve the General Arrangement Drawing (GAD) and construction drawings, respectively. The contractor M/s AB Infrabuild Ltd. has been awarded the contract. During execution, the original designs were amended in line with the most current codal regulations for steel girders inside the Railway border and the most recent revision of the Railway Specifications.

It is envisaged that the project will be implemented in two parts. In phase-I, it is intended to fabricate and install two Open Web Girders (OWG) over a length of about 99.30 metres above the railway track segment alone. The width of the bridge across the railroad track is 24.30 metres, with pedestrian walkways on each side. The girders in question will rest on end piers constructed by R.C.C.

In phase-II, it is intended to build approaches with a width of 17.50 metres on both the east and west sides, as well as service roads at ground level on both sides of the approach road. The east side approach is approximately 220 metres long and terminates near Ambedkar Chowk, while the west side approach is approximately 293 metres long and terminates beyond the intersection of Ramdev Peer Marg and Kirol Road in order to avoid traffic congestion outside the station area and at the intersection of Ramdev Peer Marg and BEST Depot on the west side of Vidyavihar Railway Station. Ticket booking offices on the east and west sides that interfered with the ROB alignment had to be relocated. The actual bridge building could not begin until the destruction, renovation, and activation of new ticketing offices.

The location is located at a popular station on a suburban rail route that serves the east side's main educational centre. Hence, there are working hour restrictions. In addition, the massive truss members are raised to a height of 11 to 12 metres for assembly. Although though the time period excludes the monsoon, the work was performed during dry periods throughout the monsoon in 2022, with the prior agreement of the appropriate authorities.

On-site assembly of the first girder OWG is now under process. The first girder is scheduled to be launched by the end of February 2023, pending approval of power and traffic blocks from the railway department. The second girder is scheduled to be released in May 2023. The approaches work will then be carried out. The project is anticipated to be finished in 2024.

Dahisar-Mira-Bhayander Elevated Road

Mumbai is one of the world's most densely inhabited cities. In India, the Mumbai Metropolitan Region (MMR) has the biggest urban agglomeration.

MMR economic activity is intertwined with Greater Mumbai Region economic activity (BMC). Hence, there is a steady flow of people between the neighbouring cities and the Brihanmumbai Municipal Corporation Region. The Mira-Bhayander Municipal corporation (MBMC) is located on the northern border of the Brihanmumbai Municipal Corporation (BMC).

The Western Express Highway and Western Railway lines serve as the sole ways of communication between the Mira Bhayander Municipal Municipality and the Brihanmumbai Municipal Corporation at the present time. This causes constant traffic congestion on the WEH and overcrowding on local trains. The single point of road access, Dahisar Check Naka, has considerable traffic congestion.

The MMR regional plan includes a key coastal connection from the western edge of Dahisar to Bhayander, based on previous planning studies. Under their separate Development Plans, both municipalities have accounted for stated interconnectedness.
The project involves the building of a 45-meter-wide elevated road between Kandarpada, Link Road at Dahisar west in the BMC boundaries and MiraBhayander west in the MBMC limits. The planned road is a five-kilometer elevated construction with a length of about 1.5 kilometres under BMC authority and 3.5 kilometres in MBMC jurisdiction.

The planned elevated road connection would begin at Kandarpada Metro station on Link Road in Dahisar West and end near Subhash Chandra Bose Ground in Bhayander West on Uttan Road. The elevated road must be 45 metres wide and four-by-four lanes broad. It will be built upon stilts.

This will reduce the burden on the Dahisar east check naka by 30 to 35 percent. The project is now being executed by the BMC, which is offering a variety of contemporary amenities. It is a singular local organisation that tackles such difficult undertakings for the public good.

Signal-free multi-level road inter. changes on both sides to avoid traffic congestion, multi-level seven-storey mechanised parking lots, toll plazas, Electrical Vehicle (EV) chargingg stations, bus terminal, space needle structure having more than 100 m tall structures with Spectacular viewing gallery, introducing new architecture and an engineering marvel in the MMR, with provision for linking in the future with the Coastal Road development. The project's alignment traverses natural regions such as mangroves, stream areas, salt pan lands, etc.

Throughout the execution of this project, a number of environmental concerns were included into engineering ideas, together with optimum design and cost estimations, in order to avoid environmental harm and maximise the public's benefit. The project is environmentally friendly and eco-friendly. It will aid in lessening Mumbai's traffic congestion, provide commuters with pollution-free transit, and be one of the marvellous MMR projects.

The project is currently in the bidding phase and is anticipated to be finished within 42 months. The anticipated cost of the project is around 2,527 billion rupees. The project is being developed on a Design and Build basis, allowing bidders to optimise cost and inject creativity while integrating new technologies and adhering to international quality standards in the most cost-effective manner. The winning bidder will be required to get all relevant authorizations from different agencies, including CRZ, Salt Pan Commissioner, MoEE CC, etc. While this is a Design and Build project, the exact construction cost will be determined by the bidders.

Bhandup Complex Water Treatment Plant of 2000 MLD Capacity

A new 2000 MLD Water Treatment Plant (WTP) is being constructed at the Bhandup Complex, involving civil, mechanical, electrical, and instrumentation works under a Design, Build, and Operate (DBO) contract with an O&M duration of 15 years, open technology, and a small footprint. The bidding procedure will commence shortly.

In 1978, a WWTP with a capacity of 1,010 MLD, a pumping station, and a Master Balancing Reservoir (MBR) was commissioned at the Bhandup Complex. At the time, it was the biggest water treatment facility in Asia. Nowadays, it provides over fifty percent of Mumbai's potable water supply needs.

Despite periodic maintenance and repairs and 44 years of uninterrupted operation, the facility is reaching the end of its useful life.

It was deemed necessary to construct a new WTF using the most recent, more effective technology for water filtration in accordance with ISI requirements. In the sphere of water technology, global expressions of interest were solicited from reputable technology suppliers and bidders. The design and procurement of new plant would commence immediately so that this size of plant may be commissioned within two to three years, i.e., before the remaining useful life of the old plant expires.

Worldwide, chlorine-based disinfection is being replaced with safer, more environmentally friendly advanced disinfection techniques. Hence, it was decided to construct a new advanced 2000 MLD WTP with a small footprint, using an alternative sophisticated disinfection method in lieu of chlorine gas. The original 1910 MLD WTP will be maintained with necessary repairs throughout the 36-month construction phase of the new WTP.

H/W I Ward, S Ward, and T Ward Microtunneling (MT) Projects

Micro-tunneling (MT) is a technique for correctly installing pipes without excavating extensive trenches on the ground surface. It employs laser-guided, remote-controlled tiny shields for tunnel boring and pipe jacking technology for filling the bore with the product pipe. It is suggested to carry out further projects using this strategy. Installing sewage line from the existing manhole in front of the Mannat Bungalow to the 'T' junction "H/W Ward MT intersection at I Love Bandra' monument on B. J. Road and from Chimbai Pumping Station to Mother and Son's statue on S V Road.

The objective of the S. V. Road sewer tunnel project is to improve the capacity of the current wastewater collecting system in zone 3, while allowing the decommissioning of the existing Jai Bharat Pumping Station and Chimbai Pumping Station. The length is 4470 metres in total. Standing Committee Resolution (SCR) is awaited; anticipated start and end dates are April 2023 and March 2026, respectively.

S Ward, Bhandup (E), installation of sewage line by MT through Seth Govindram Jolly Marg to JJVLR to EE Highway to Bhandup Pumping Station along EE Highway service road.

Kannamwar Nagar, Vikhroli (East) is an MHADA-designed residential area. The ancient sewage system has deteriorated and is overflowing in several locations. The planned sewage line has a total length of 5,390 metres. The anticipated start date for SCR is April 2023 and the anticipated completion date is January 2027.

Pipe sewer line installation using Micro-Tunneling and Pipe Jacking Technique between Bhandup Pumping Station and Hari Om Nagarat Mulund (E) in Mumbai "T Ward.
Due to subsequent construction with an increased FSI, the current sewage network is inadequate in this region. The length of the whole sewage pipe is 4260 metres. The anticipated start date for SCR is April 2023 and the anticipated completion date is October 2026.

Seven Sewage Treatment Facilities throughout Mumbai

The Mumbai sewage system is separated into seven zones. Each has a facility for disposal. These are older than twenty years.

In Colaba zone, the Design, Build (DB), Operation & Maintenance (O&M) of a Waste Water Treatment Facility (WWTF) with a design capacity of 37 MLD was granted in July 2016. The facility was put into operation in April 2020. In order to fulfil the most recent effluent discharge requirements, biological treatment (secondary treatment) of sewage is carried out using a 'Sequential Batch Reactors' technology. It is then released into the Arabian Sea 1.15 kilometres offshore by a marine outfall. It has a tertiary treatment capability of 10 MLD for handling secondary processed sewage for non-potable consumption.

This may be increased up to 37 MLD. Worli (500 MLD), Bandra (360 MLD), Dharavi (418 MLD), Versova (180 MLD), Malad (454 MLD), Ghatkopar (337 MLD), and Bhandup (215 MLD) WWTFs will be upgraded/constructed in May/July 2022 by BMC. 50%, or 1233 MLD, of the total secondary treatment capacity of 2464 MLD will be further treated at the tertiary level.

The work on six WWTFs began on July 5, 2022, and on the Bhandup WWTF on August 23, 2022.

The design and construction cost of Worli WWTF is Rs 3,608,48 crore. 5 years of DB era are followed by 15 years of 0&M. Beneficiaries will reside in Fort, Byculla, Pedder Road, Gamdevi, Haji Ali, Prabhadevi, Dadar, and Worli neighbourhoods.

Bandra WWTF: The design and construction cost is Rs 2,674.14 billion. Five years of DB are followed by fifteen years of O&M. Beneficiaries will reside in Mahim, Bandra, BKC, Kherwadi, and Santacruz.

The design and construction cost of Dharavi WWTF is Rs 2,764,26 crore. Five years of DB are followed by fifteen years of O&M. Beneficiaries will reside in Matunga, Wadala, Sion-Koliwada, and Brahmanwadi.

The design and construction cost of Versova WWTE is Rs 1,075,79 crore. Four years of DB are followed by fifteen years of O&M. Beneficiaries will reside in Andheri East and West, Vile Parle East and West, Juhu, Versova, and Oshiwara.

The design and construction cost is Rs. 4,523,34 crore Six years of DB (including land reclamation) are followed by fifteen years of 0&M. Beneficiaries will reside in Dahisar, Borivali, Kandivali, Malad, and Goregaon.

The design and construction cost of Bhandup WWTF is Rs. 847.91 billion. Four years of DB are followed by fifteen years of O&M. Beneficiaries will reside in Bhandup, Vikhroli, Kanjur Marg, and Mulund.

Ghatkopar WWTF: The design and construction cost is 1,687.82 billion rupees. Four years of DB are followed by fifteen years of O&M. Beneficiaries will reside in Ghatkopar, Mankhurd, Govandi, and Chembur.

The works of these seven WWTFs are granted in accordance with the timetable presented by the BrihanMumbai Municipal Corporation to the Honorable Supreme Court of India on February 11, 2022 in proceedings of Civil Appeal No. 5036/20019. The Supreme Court is monitoring the development of these projects.

Arch Storm Water Drain (SWD) Rehabilitation Using Geopolymer Lining Trenchless Technology (GLTT)

In the metropolitan region of Mumbai, there is a network of more than 100-year-old Arch Storm Water Drains (SWDs) that are operational 24 hours a day, seven days a week. They transport dry weather flow during the dry season and monsoon rainfall during the wet season.

Now, the state of the network has worsened, and certain sections are in danger of collapsing. Since the construction of the aforementioned Arch SWDs, no repairs or rehabilitation work have been performed. The overall length of the current Arch SWD network is 23548 metres, of which 14285 metres of Arch SWD need urgent maintenance to prevent accidents and increase the lifespan of the network.

In response, the BMC has solicited E-Tenders for the rehabilitation of the Arch SWD network using Geopolymer Lining Trenchless Technology (GLTT), as recommended by an Expert Technical Advisory Committee. This innovative GLTT will be utilised for the first time by the Storm Water Drains (SWD) Department of BMC to restore Arch SWDs with a diameter of 900 mm or more. For the Geopolymer Lining, a high-speed, spin-cast motor is employed.

For quality assurance, producers of Geopolymer Lining products must be accredited by the Water Research Centre (WRC), an international organisation that certifies manufacturers of Geopolymer Lining products based on the tests defined in ASTM standards. Being a novel technology, the bidders are required to have their ideas and designs approved by reputable institutions such as IIT Bombay.

The scope of the bid includes the rehabilitation of 27 components of existing Arch SWDs spanning about 14285 metres in length. The cost of the project is around Rs. 415.28 crore, which includes maintenance for five years. The duration of the project is three years, excluding the monsoon. The anticipated completion date is November 15, 2027.

Reconstruction Of The Carnac Road Over Bridge (ROB) In Close Proximity To The Masjid Bunder Station

The 1868-built Carnac Road Over Bridge (ROB) was deemed decrepit by the Central Railway Administration after a structural assessment study from IIT Bombay.

As Central Railway dismantled a piece of the railway, the Central Railway Authority notified the BMC to assume responsibility for the reconstruction.
For the public's safety, the Carnac Bridge has been restricted to heavy vehicle traffic since 2014.

The contract for the reconstruction of the Carnac bridge was granted on August 10, 2017. On 19.08.2022, after the opening of the Hancock ROB to the public, the Bombay Joint Commissioner of Police (Traffic) issued a No Objection Certificate (NOC) for the destruction and reconstruction of the Carnac ROB.

Hence, the Central Railway Administration has dismantled the ROB under the railway's authority between August 20 and November 21, 2022. Hence, the BMC has assumed full responsibility for the repair of the Carnac Bridge, which is under underway.

The rebuilding of the Carnac Bridge is crucial since it serves as an important connection in south Bombay and has reached the end of its operational life. The planned bridge would be a single structure with no intermediary supports inside the railway lines, so releasing all railway tracks and preventing any interference.

The defining characteristics of this reconstruction effort are as follows: (a) On the west side of the ROB, 100 metres in length with a 15-foot clear carriageway. Three 10 metre wide Vehicle Underpasses (VUPs) are planned. (a) The Railway Portion of the ROB is 70 metres long and 15 metres wide. Two 20-meter-wide viaducts are constructed on the east side of the 130-meter-long and 15-meter-wide ROB.

The substructure consists of: (a) Pile, pile cap, pier, and pier cap at both side abutments (b) Box light motor vehicle underpass on west side for 30 metres of RCC (c) Reinforced Earth Wall or RE panels for solid filled approaches on both sides.

The superstructure is made up of (a) steel girders and deck slab on the railway part, (b) pre-stressed girders on the east side, and (c) solid earth filled approaches with Cement Concrete or CC road.

During the rebuilding planning process, the breadth of the existing bridge was expanded. It will accommodate four lanes of automobile traffic.

Mumbai Roads Concretement

There are 2,050 kilometres of roadways in Mumbai, of which 990 kilometres are paved. The concreting of 265 kilometres of roadways is under process. Today, the BMC has begun concreting 397 kilometres of roads, which is expected to be finished in two years. This year, the tender for the remaining roads will be launched.

During the process of concreting these roadways, precast conduits and drains will be installed. Precast conduits will prevent external utilities from trenching on roadways and permit their installation without excavation. Prefabricated drains will assure quality and save construction time. The planned soak pits at 400-meter intervals to prevent floods would enable rainwater to filter into the ground and prevent the lowering of the ground water table, therefore boosting the performance of borewells.

In order to maintain control over the building process, CCTV is included in the bid. There will be QR tags on the barricades so that people may get information on the construction from any place.

The overall length of Mumbai's roadways is 5,364 kilometres, of which 1,273 kilometres have already been concreted. In 2022-23, the BMC Roads Department will construct 784 roads with a total length of 265 kilometres at a cost of Rs. 2,210.90 crore. New works of 910 roads of 397 km are now proposed at a cost of Rs. 6079 crore; of these, 212 roads of 72 km length will be developed in the city area at a cost of Rs. 1233 crore, 182 roads of 71 km length will be developed in the eastern suburbs at a cost of Rs. 846 crore, and 516 roads of 254 km length will be developed in the western suburbs at a cost of Rs. 4000 crore.

Destruction & Rebuilding of the Existing Gopal Krishna Gokhale Bridge in Andheri

The current Gopal Krishna Gokhale Bridge in Andheri is being demolished and rebuilt since the BMC approaches were in poor condition and the Railways raised its height from a minimum of 5.5 m to 8.30 m from an overhead wire and drainage standpoint. Construction on the BMC approaches began on February 18, 2021, after receipt of a traffic NOC. The Railways will demolish their share by March 2023, at which point construction will start. The contract is valued at Rs 112.68 crore for the approaches work and Rs 77.54 crore for the rehabilitation of the railway segment.

The length of the project, including monsoons, is eight months. The first phase of construction is anticipated to be open to traffic by June 2023. To date, the pedestals for seven piers and two abutments of Phase I have been cast. In Daman, fabrication of roughly 1000 MT of Girder for the BMC component is under process. The launch began during the first week of December 2022. On-site bearings were received.

The manufacturing of the railway segment has not yet begun, since the Railway Board has not yet granted final approval of the open web 90-meter girder design.

The construction was delayed as a result of reasons such as obtaining a traffic no objection certificate (NOC) and modifying the pier's design per railway recommendations owing to an increase in the height of the railway segment. The scope of work is the rebuilding of the railway bridge on both sides of the 90-meter-by-13.5-meter span, including the P5 and P6 piers (open foundation). Two trusses of structural steel grade FE-570 (E- 450) according to IS:2062:2011 with a minimum yield strength of 430 N/mm2 compose the railway span.

The bridge is now blocked to all traffic. The region is surrounded on both sides by barriers. By acquiring blocks at night, railways are removing steel junk and concrete debris from the railway segment.

Micro-Tunnelling (SWD) Operation At Dharavi & Masjid Bunder

During the monsoon, water accumulates on the railway tracks at Dhobi Ghat Dharavi, Gurunanaka School on Road 26 at Sion, and Mukhyadhyapak Bhavan at Sion every year. BMC has begun building of a new SWD network in Dharavi in an effort to alleviate flooding in these sites. The scope of work included the building of a 4m x 2m box drain on Sant Rohidas Marg, as well as the installation of SWD lines of different widths along Roads 1 and 2 at Dhobi ghat and 90ft road in Dharavi.

To provide communication between SWD lines installed on Transit Camp roads 1 and 2 and a 4m x 2m box drain under construction on Sant Rohidas Marg, it is planned to build a micro-tunneled SWD line with a diameter of 1800 mm at a depth of about 7 metres for a length of 360 metres. The cost of the project is Rs. 12.12 billion. Construction begins on December 7, 2021. The excavation of the driving pit is complete, and micro-tunneling will soon commence. The project will be finished prior to the 2023 monsoon.

With strong monsoon rains, flooding also occurred on the west side of Masjid Railway Station on YM Road, Narsinath Road, Abhayanand Gandhi Road, the Central Railway track at Masjid, the east side of the railway track on Sant Tukaram Road, and Devaji Ratansi Road. Before monsoon 2022, the BMC built 1000-diameter SWD from the YM Road intersection to the Central Railway track on the west side of Masjid Station and from the railway to Sant Tukaram Road on the east side of Masjid Station. Before the monsoon of 2022, the railway administration had microtunneled a 1000 mm diameter SWD Line under the Central Railway track.

The total length of SWD drain pipe installed is 300 metres. The length of microtunnelling work performed by Railway Authority under a railway track is sixty metres. The project, which began on 01.06.2021 and lasted 9 months and cost 1.11 crore rupees, has been finished.

Mithi River D&PC Project (Package-III)

BMC has hired Frischmann Prabhu (I) Pvt. Ltd. as a consultant to compile the feasibility study and full project report in order to reduce the pollution of the Mithi River. The consultant offered four packages of short-term (Package-I) and long-term (Package-III, II, and IV) methods to transfer the dry weather flow of about 285 MLD, which is now dumping into the Mithi River, to the Municipal Sewer system. The Package III activities are positioned in the tidal effect zone for long-term considerations (between CST Bridge and Mahim Causeway including Vakola River).

At said section, the river's bed has a level slope. Hence, during the monsoon season, when heavy rainfall coincides with high tide, the discharge velocity of river water is significantly reduced. The river water pours back into the different outfalls in the tidal zone, resulting in flooding in the low-lying regions along the river banks.

In order to alleviate this serious problem of flooding, particularly between Sion and Kurla railway stations, it is recommended to implement the Gate Pump Technology in Package-III tenders, which will be deployed at 26 Mithi River outfalls located in the tidal zone.

The scope of Package-III work includes training of river, construction of retaining wall and service road), sewer pumping stations, interceptions and diversion works for diverting dry weather flow (DWF) of various outfalls or nullahs into the Municipal nearby existing Sewer networks, storm water pumping stations by using gate pumps, beautification including promenades for recreation activity and allied works.

It includes sewer line construction (7.61 km), retaining wall (1.77 km), service roads (4.961 km), 28 interceptors, 26 gate pumps, 1 sewage pumping station, and 12.04 km of river beautification including promenades, with operation and maintenance (0&M) for 10 years at an estimated cost of Rs. 2,156 crore. The solicitation notice was released on 01.06.2022, and the bidding procedure is now ongoing. The duration of Package-III construction is 36 months (including monsoon). The projected start date is October 2023, and the completion date is September 2026.

Impact on real estate market in Mumbai

In the roads sector, the BMC intends to completely concretize roads to eliminate pothole issues. Nevertheless, taking into account the possibility that the concretisation process might exacerbate waterlogging difficulties in particular regions, the bids also include remedial measures to prevent waterlogging.

The BMC will construct a new Coastal Road between Versova and Mira Road. When finished, this route would provide smooth connection to South Mumbai and also relieve congestion on the Western Express Highway.

The Goregaon-Mulund Link Road (GMLR) project will be awarded shortly, and construction is anticipated to begin this year. The bid is at an advanced stage, and the contract might be granted by April 2023.

Several additional bridges are planned and being bid on to alleviate congestion and choke spots.

For instance, the planned bridge between Khar Subway and Western Express Highway would alleviate congestion and improve connectivity. This year, construction orders will be issued to construct more than a dozen of these bridges.

Since quite some time ago, Mumbai has been plagued by monsoon flooding problems. Yet, the BMC has aggressively constructed flood water storage tanks, performed microtunneling under railvay tracks, and deployed a vast array of flood water mitigation methods. In the last three years, Mumbai residents have received significant respite from flood-related difficulties.

To diversify its water security strategy, the BMC is in the final stages of constructing a 200 MLD desalination plant near Manori. This is also scalable to 400 MLD, which could alleviate Mumbai's water scarcity until 2030.

100 metres below the surface, water supply tunnels are being constructed to enhance water distribution. Now, two tunnels of this kind are being constructed in Mumbai.
Newly granted Waste Water Treatment Plant (WWTP) projects in Worli, Bandra, Ghatkopar, Dharavi, Malad, Versova, and Bhandup will manage sewage waste. To transmit sewage to these WWTPs, the BMC is constructing three kilometres of deep tunnels.

The BMC has been ambitious in its planning and implementation of construction projects. Around 2024-25, Mumbai will reach a tipping point and become a world-class metropolis with superior infrastructure.