To undertake integrated condition appraisal within submerged zones of the foundation gallery interface of Dhamni Dam Surya Major Project Taluka Vikramgad, District Palghar for identification of probable seepage trajectories

पालघर जिल्ह्यातील विक्रमगड तालुक्यातील धामणी धरण (सूर्या मोठा प्रकल्प) येथे फाउंडेशन गॅलरी इंटरफेसमधील जलमग्न भागात एकत्रित स्थिती पाहणी करून संभाव्य गळतीचे मार्ग ओळखणे.

Underwater Videography Deployment of a work-class remotely operated observation platform (ROV) suitable for submerged and confined hydraulic environments. Depth rating: ≥ 300 m (≈30 bar), with continuous operational endurance ≥ 12 hours on stable external power. Configuration: compact, hydrodynamically stable, neutrally buoyant for precise maneuvering in gallery/interface zones. Primary imaging system: Resolution: 4K UHD (≥ 3840 × 2160) Optical zoom: ≥ 20× true optical Sensor: low-light CMOS, high dynamic range Secondary imaging system: ≥ 12–13 MP wide-angle (≥ 120° FOV) OIS + micro-gimbal stabilization (pan–tilt ≥ ±90°, 360° rotation) Illumination: ≥ 5000–6000 lumens LED, dimmable Color temperature: 5000–6500 K Video performance: Real-time feed with latency ≤ 200 ms Recording in high-bitrate H.264/H.265 or lossless formats, with time-stamped logging Tether: 400 m neutrally buoyant, Foam-reinforced Tensile strength ≥ 300 kg, integrated power + data (fiber/ethernet) Capability to detect and document cracks (~0.5 mm and above), joint openings, seepage points, cavities, corrosion, and surface deterioration.

Underwater Sonar Scanning Integration of dual frequency multibeam sonar: Frequency: 700 kHz to 1.2 MHz Beam width: ≤ 1.8° (high-resolution mode) Swath coverage: up to 120° horizontal FOV Effective range: 0.5 m to ≥ 50 m (site/turbidity dependent) Resolution: mm–cm level at close range Outputs: Real-time acoustic imaging (sonograms) Point cloud (XYZ) data for 3D reconstruction Capability to identify voids, cavities, scoured zones, delamination, and material loss, including features beyond visual range. Data fusion: synchronized integration of sonar + video for improved interpretation. Position referencing: compatibility with acoustic positioning (e.g., USBL/DVL) for spatial accuracy. Additional System Requirements: Propulsion: minimum 8 vectored thrusters for full 6-DOF control. Navigation & sensors: 9-DoF IMU, depth sensor (±0.1% accuracy), compass. Control system: industrial-grade console (IP65) with real-time telemetry and logging, i7 processor, Industrial joystick. Operating conditions: suitable for low visibility (<1 m), high turbidity, and confined hydraulic zones. Compliance: relevant IEC/ISO standards for electrical and environmental safety

Data Analysis & Reporting Processing using advanced hydrographic/structural analysis software supporting multi-sensor datasets. Generation of geo-referenced outputs (latitude, longitude, depth / XYZ). Point clouds and 3D models (mesh/TIN) for structural visualization. Quantification of defects: Crack measurement accuracy: ±1 mm or better Cavity/void dimensioning via 3D analysis Surface undulation/deviation with sub-centimeter accuracy Mapping outputs: Heat maps for anomaly/stress-prone zones. Contour/elevation profiles of submerged surfaces Analytical evaluation: Residual service life estimation Failure mode indication Structural response under hydrostatic conditions. Deliverables: Raw datasets (video, sonar, sensor logs) Processed outputs (maps, models, annotated visuals) Final technical report with findings and recommendations. Data formats: standard engineering formats (. LAS, .OBJ, .CSV, GeoTIFF), with complete metadata.

Mobilization and demobilization Mobilization and demobilization of equipment, UV systems, and technical crew to and from inspection site.