Run-of-River Hydropower and Supporting HD200 Temporary Steel Bridges in Nepal

1. Overview of Run-of-River Hydropower

1.1 Definition of Run-of-River Hydropower

Run-of-river (RoR) hydropower generates electricity relying on natural river flow and natural elevation drop, without constructing large storage reservoirs to regulate water volume. Developers build a small diversion weir to channel river water into a long diversion tunnel, drive turbines, and discharge water back to the original river downstream. Unlike large reservoir hydropower, RoR projects occupy minimal land, require shorter construction cycles, and avoid massive inundation of mountain land.

1.2 Why RoR Hydropower Dominates Nepal’s Power Supply

Nepal is covered by steep Himalayan mountain ranges with dense glacier-fed rivers, creating abundant natural water head ideal for RoR development. The country owns over 42,000 MW exploitable hydropower resources, yet less than 10% has been tapped, and nearly all operational plants are RoR schemes.

First, large reservoir dams face severe barriers: long environmental approval procedures, huge land acquisition costs, high seismic and flood risks, and limited government funding. Second, private independent power producers (IPPs) prefer RoR projects for lower upfront social conflict and faster return on investment. Third, Nepal lacks coal, natural gas and petroleum reserves; fossil fuel power generation relies entirely on expensive imports, making clean local hydropower the only viable base power source. RoR electricity surpluses in monsoon can be exported to India and Bangladesh for foreign exchange, forming a core national energy strategy.

1.3 Core Advantages of Run-of-River Hydropower

  1. Low operational cost: No fuel consumption after completion; only daily equipment maintenance fees.

  2. Clean renewable energy: Zero carbon emissions, complying with global carbon neutrality targets.

  3. Mild ecological impact: No large-scale river interception, retaining basic natural river flow.

  4. Flexible private investment: Suitable for small-to-medium IPP development, boosting local employment and tax revenue.

  5. Cross-border trade value: Surplus monsoon power can be exported to energy-short Bangladesh via India’s grid.

2. Necessity and Functions of Temporary HD200 Steel Bridges for RoR Construction

2.1 Geographic Reasons Requiring Temporary Steel Bridges

Nepal’s RoR plants are distributed in remote V-shaped mountain valleys, separated by rapid mountain rivers. Original rural trails are narrow and uneven, unable to bear heavy construction trucks, tunnel rigs, cement bulk carriers and turbine components. Permanent concrete bridges need months of foundation pouring and curing, which wastes the limited dry-season construction window (October–May). Annual monsoon floods wash away simple dirt crossings, cutting off site transport and causing long construction delays. Modular HD200 steel bridges become the only feasible cross-river transport solution.

2.2 Key Functions of Temporary Steel Bridges

  1. Heavy construction logistics: Connect tunnel portals, weir headworks, mixing yards and worker camps for continuous material and machinery delivery.

  2. Monsoon emergency rescue: Fast restore traffic after flood or landslide damage to avoid full site shutdown.

  3. Post-operation maintenance access: Hot-dip galvanized HD200 bridges can be retained as semi-permanent crossings for regular tunnel and powerhouse inspection after construction.

  4. Auxiliary pipeline carrier: Support construction power cables and water supply pipelines across rivers to reduce separate underwater laying work.

HD200 Bailey Bridge in Nepalese Mountain Valley

3. Incremental Launching (Cantilever Pushing) Installation Method for HD200 Bridges

3.1 Standard Installation Steps

  1. Assemble HD200 truss panels, decks and reinforced components on a flat assembly platform on one river bank, equipped with sliding rollers and a lightweight launching nose at the front.

  2. Use hydraulic jacks or winches to push the whole bridge section forward incrementally across the river gap; the launching nose balances the cantilever weight to prevent collapse.

  3. Continue adding new truss sections at the rear while pushing forward until the entire bridge lands on the opposite abutment.

  4. Fix all connections, remove  rollers and complete guardrail installation for official opening.

3.2 Why Incremental Launching Is Preferred in Nepal

  1. No large heavy cranes required: Mountain river banks lack flat space for truck crane parking; launching only needs a small assembly yard on one side.

  2. Adapt to narrow, steep valley terrain: The opposite bank only needs simple abutments without pre-assembly space.

  3. Shorten construction time: Entire assembly and launching can finish within 7–14 days, maximizing dry-season working periods.

  4. Lower flood risk during installation: Fast construction minimizes exposure to sudden monsoon surges compared with concrete bridge casting.

4. Mature Market Layout of Evercross Bridge in Nepal

Evercross Bridge Technology (Shanghai) Co., Ltd. has established a mature localized service system for Nepalese hydropower and rural infrastructure projects. In June 2026, the firm completed its second HD200 reinforced Bailey bridge (TSR3 Project), a 51.816-meter single-span three-row single-layer structure with 40-ton load capacity and full hot-dip galvanized anti-corrosion treatment, perfectly adapted to Nepal’s humid mountain climate.

Prior to TSR3, Evercross delivered the first HD200 three-row reinforced steel bridge in Nepal, forming two tangible demonstration projects for local hydropower IPPs, road bureaus and engineering contractors. The company has optimized full-cycle services including customized load design, factory pre-assembly, third-party load testing, overseas on-site supervisor dispatch and lifetime spare parts supply after accumulating rich experience in Nepalese mountain logistics and installation standards.

With proven HD200 project references in Nepal’s valley hydropower construction scenarios, Evercross has secured a leading position in South Asia’s prefabricated steel bridge market, and will continue supplying high-performance modular bridges to support the booming run-of-river hydropower development across Nepal.