Reservoir and Dam Capacity Surveys: Why They Matter
Every reservoir loses storage capacity over time as sediment carried in by rivers settles on the bottom. A dam designed to hold a certain volume decades ago may hold significantly less today, and the only way to know the real number is to measure it directly.
A bathymetric survey of a reservoir compares current bottom elevation against the original design profile, revealing exactly how much capacity has been lost to sedimentation and where the buildup is concentrated.
Watch Sediment Build Up Over Time
Live Sedimentation Simulation
See Capacity Loss Over Time
Interactive Capacity Calculator
Compare Design vs Actual Depth
Click Cross Section to Compare
How Reservoir Capacity Surveys Work
Full reservoir bathymetric mapping
Sonar survey lines cover the entire reservoir, capturing current bottom elevation across the full water body.
Design profile comparison
Current depth data is compared against the original design bathymetry or the earliest available survey.
Sediment volume calculation
The difference between design and current profiles is integrated across the reservoir to calculate total sediment volume.
Capacity curve generation
A revised storage capacity curve shows actual usable volume at different water levels, replacing outdated design assumptions.
Management recommendations
Results inform decisions about dredging priorities, operational water level planning, and dam safety assessments.
Many dams in operation today were designed using storage capacity figures calculated decades ago, before significant sedimentation occurred. A current bathymetric survey often reveals meaningfully lower usable capacity than official records suggest.
A dam's design capacity is a number from the past. A bathymetric survey tells you what it actually holds today.
Planning Your Reservoir Assessment
Accurate current capacity data supports better water management decisions, dredging planning, and dam safety compliance. Our drone survey team conducts full-coverage bathymetric surveys for reservoirs and dams across India, comparing current conditions against design records.
Need an updated reservoir capacity assessment?
Tell us about your reservoir and we will outline our bathymetric survey approach.
Frequently Asked Questions
Sediment carried in by rivers settles on the reservoir bottom over time, gradually reducing the usable water storage volume below the original design.
A bathymetric survey using sonar measures current bottom elevation across the reservoir, which is then compared against original design profiles.
Frequency depends on sedimentation rates and regulatory requirements, though many operators schedule periodic surveys every several years for ongoing monitoring.
A capacity curve shows usable storage volume at different water levels, derived from current bathymetric survey data rather than outdated design figures.
Yes, survey data showing where sediment has concentrated helps operators prioritize dredging locations for maximum capacity recovery.
Yes, accurate current capacity data supports flood routing calculations and operational planning that are important components of dam safety assessments.
Capacity loss varies widely depending on watershed erosion rates and reservoir age, making site-specific bathymetric surveys essential for accurate figures.
Survey vessels or unmanned surface vehicles equipped with single or multi-beam sonar and GPS positioning are commonly used for reservoir surveys.
Yes, bathymetric surveys are typically conducted without interrupting normal reservoir operations, though water level affects accessible survey area.
Typical deliverables include a bathymetric map, sediment volume report, and an updated storage capacity curve for the reservoir.
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