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Planning stages and field investigations

Short answer

Hydropower planning stages are reconnaissance, pre-feasibility, feasibility, and detailed design. Field investigations range from site visits, spot discharge, and regional hydrology at reconnaissance; topographic survey, gauging, and surface geology at pre-feasibility; detailed survey, drilling, and EIA at feasibility; to precise foundation surveys and model tests at detailed design.

What are the various stages of hydropower planning? If you have been appointed as a water resources engineer in the Water Resources Ministry and you are assigned to undertake various investigations related to water resources, discuss the field investigations you carry out at various stages of the hydropower project.

Stages of hydropower planning

  1. Reconnaissance (identification)
  2. Pre-feasibility
  3. Feasibility
  4. Detailed engineering design and tender

Field investigations at each stage

Reconnaissance

  • Site visit for access, river and valley form, rough geology.
  • Spot discharge measurement; use of regional hydrology; collecting maps.
  • Identify environmental and social constraints.

Pre-feasibility

  • Topographic survey of key areas; river cross-sections.
  • Hydrology: install a gauge, measure flows, estimate FDC, floods and sediment.
  • Geology: surface mapping, geophysics and a few boreholes.
  • Survey of access road and transmission line corridors; preliminary IEE scoping.

Feasibility

  • Detailed topographic survey (1:1000 or larger) at all structure sites.
  • Hydrology: at least one year of gauging, sediment sampling, flood and low-flow analysis.
  • Geology/geotechnics: drilling at weir, intake, desander, tunnel portals, penstock and powerhouse; test adits; laboratory and in-situ rock/soil tests; material surveys.
  • Socio-environmental baseline survey and IEE/EIA field work, land and settlement survey.

Detailed design

  • Very detailed survey and extra drilling and tests of the exact foundation of structures.
  • Hydraulic model tests (spillway, intake, desander).
  • Final hydrological check, and survey for construction camps, roads and transmission line.
  • Environmental monitoring programme set-up.

✓ Answer checked by Claude Opus 5.5 (high effort)

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