Embarking on the quest for precision and comprehensive understanding, the Tamor Khola-5 Hydropower Project executed detailed topographical surveys as a cornerstone of its development strategy. The primary objective was to meticulously examine the newly proposed powerhouse area and potential locations such as the inlet portal, outlet portal, surge shaft, penstock alignment, and surrounding features.
The survey initiative was launched with a meticulous desk study, leveraging available small-scale maps and digital resources. Prior to fieldwork commencement, reconnaissance and monumentation activities were conducted on-site, establishing 12 permanent ground control points spanning the entire project area from headworks to powerhouse.
Using the closed traverse method, ground control stations were strategically positioned, ensuring that the misclosure of the traverse survey remained within acceptable limits. The accuracy achieved with instruments boasting a least count of 2″ was remarkable – linear closing errors of 0.002 m in Northing, 0.005 m in Easting, and -0.006 m in Elevation. The closing errors adhered to survey standards, with distribution following the Compass rule.
The established benchmarks served as the bedrock for the ensuing topographical survey. Executed with precision using a state-of-the-art Total Station with 2″ accuracy (Model: SOKKIA fx-102), the survey encapsulated all manmade and natural features. The culmination of these efforts resulted in a final topographical map presented in an appropriate scale, providing a comprehensive overview of the project area.
The initial detailed topographical survey, conducted with thoroughness, reached completion in January-February 2021. However, the dynamic nature of project development prompted a revision of the location of various components. Subsequently, an additional topographical survey unfolded in May-June 2022, aligning with the finalized project layout.
This dual-phase approach covered all alternative scenarios for project components, ensuring a holistic understanding of the terrain. The outputs of both the detailed and additional topographical surveys not only meet but exceed the requirements for further studies on the project layout. The Tamor Khola-5 Hydropower Project stands at the intersection of precision and progress, where every contour is meticulously charted for a sustainable energy future.