Vortex In A Creek: A Hands-On Field Manual For Building A Gravitational Water Vortex Power Plant

Viktor Schauberger died in 1958 still chasing an implosion engine that violated thermodynamics. The part of his work that survived subtraction is the vortex basin — and it now generates electricity in twenty-plus countries from creeks too small for any other turbine. Here is exactly how to build one, with geometry math, materials list, PMA wiring, controller setup, permit walkthrough, and the honest numbers on what a 1-meter drop gets you.

What this manual is and is not

This is a hands-on construction manual for a small-scale Gravitational Water Vortex Power Plant (GWVPP) — the open, fish-friendly, ultra-low-head turbine architecture invented by Franz Zotlöterer in Austria in 2004 and now sold commercially by Turbulent, GWWK, Vortex Hydro Energy, and others. The architecture descends directly from Viktor Schauberger’s 1922 Steyrling log-flume work. The vortex-flow geometry is the kernel of Schauberger’s career that actually replicates.

This manual is not an implosion-engine build sheet. The Repulsine does not work. Over-unity is not a thing. We are extracting gravitational potential energy from falling water using a vortex shape that is dramatically more efficient than conventional micro-hydro at low head, and that lets juvenile fish and eels pass through unharmed. That is the prize. It is real, it is enough, and you can build one this summer.

Pair this with the companion post — Schauberger Without The Mysticism: One Man, One Real Idea, And The Turbine It Became — for the substance_lens read of Schauberger’s career separating the verifiable engineering kernel from the over-unity frame layer.

What it is and why it deploys where nothing else does

A GWVPP is a circular concrete or steel basin with a hyperbolic inner profile and a hole in the bottom. Water enters tangentially around the rim, spirals down to the central drain hole, and as it spirals it forms a free vortex with a low-pressure air core down the center. A vertical-axis turbine sits inside that vortex, slowly rotating at thirty to eighty revolutions per minute. The turbine shaft drives a generator. Water exits through the drain hole into the downstream channel.

The architecture has three practical properties that conventional turbines do not:

Ultra-low head. It works on 0.7 to 3 meters of vertical drop. Every Francis, Pelton, Kaplan, or crossflow turbine you have ever seen needs more head than that to be economic. A GWVPP turns drops that would normally be considered “not worth bothering with” into continuous power. There are millions of these sites in the United States alone — old mill races, irrigation drops, weirs, small dams scheduled for removal, natural cascades on rural property.

Fish-friendly. Slow center rotation, no fine screening, large clearances. Juvenile salmon and eels pass through unharmed. This is the regulatory killer feature in the EU and increasingly in the US Pacific Northwest, where eel passage is a non-negotiable permit requirement and conventional turbines simply cannot get approved.

Tolerant of debris and silt. The hopper is open, the runner is open. Leaves, twigs, sediment, and the occasional small fish pass straight through and out the bottom. No fine screens, no daily cleaning, no penstock to clog.

The peer-reviewed efficiency range is 50 to 83 percent. The references are Dhakal et al. (2015) in Procedia Engineering, Power et al. (2016) in Renewable Energy, and the Zotlöterer original technical paper. A well-built 1-meter-head, 0.5-cubic-meter-per-second installation produces approximately 5 kilowatts continuous, which is roughly forty-five thousand kilowatt-hours per year, which is roughly enough to fully power three to four average US households. From a creek you might already have access to.

The math: sizing your site before you build anything

The hydropower equation is simple and forgiving:

P_kW = (rho * g * Q * H * eta) / 1000

Where:

• rho = 1000 kilograms per cubic meter (density of fresh water)
• g = 9.81 meters per second squared (gravitational acceleration)
• Q = volumetric flow rate in cubic meters per second
• H = net head in meters (vertical drop between inlet water surface and tailrace water surface)
• eta = system efficiency, dimensionless

For a GWVPP, use eta = 0.65 for a conservative DIY estimate and eta = 0.75 for a well-built professional installation. The published 83 percent figure is achievable but requires precise basin geometry, optimal turbine matching, and a high-quality generator. Plan for 0.65 and be pleasantly surprised.

Worked example: a creek with a small drop

You have an irrigation drop on your property with a measured vertical drop of 1.5 meters between upstream pool and downstream channel. You measure flow rate at 0.5 cubic meters per second (more on flow measurement below). Conservative efficiency:

P = (1000 * 9.81 * 0.5 * 1.5 * 0.65) / 1000
P = 4.78 kW continuous

Annual energy at full duty cycle:

E_annual = 4.78 kW * 24 hr * 365 days = 41,873 kWh

In real life you will see seasonal flow variation, occasional maintenance downtime, and a duty cycle of 75 to 90 percent. Realistic annual output is therefore 30,000 to 38,000 kWh, which at average US residential rates of roughly 16 cents per kilowatt-hour is $4,800 to $6,000 of offset per year, or three to four households’ worth of off-grid electricity.

Worked example: the tiny end of the envelope

A small stream cascading down a wooded slope on a rural cabin property. Drop of 0.8 meters across a 4-meter run, flow of 0.15 cubic meters per second:

P = (1000 * 9.81 * 0.15 * 0.8 * 0.65) / 1000
P = 0.76 kW continuous

Annual at 80 percent duty cycle: ~5,400 kWh. This is enough for one off-grid cabin with refrigeration, LED lighting, wifi, a well pump, and a small battery bank to handle peak loads above the continuous 0.76 kilowatts.

Worked example: the bigger end

A 3-meter mill-race drop with 2 cubic meters per second flow:

P = (1000 * 9.81 * 2 * 3 * 0.7) / 1000
P = 41.2 kW continuous

Roughly 290,000 kWh per year. This is small-commercial territory — enough to power a farm operation, a small bottling plant, or a microgrid for a tiny village. This is also the scale at which you want professional engineering rather than a DIY build.

Site survey: how to measure head and flow

Before you pour a single cubic foot of concrete, you need accurate head and flow numbers. Both can be measured with hardware that costs under three hundred dollars total.

Measuring head

A laser distance level is the cheapest precise tool. A Bosch GLL2-15 or equivalent self-leveling cross-line laser costs around eighty dollars. Set the laser at the upstream pool water surface, walk downstream until the laser dot lands on a graduated stadia rod (or a tape measure stapled to a stake) at the tailrace water surface, and read the vertical offset.

For longer or wooded sites, use a leveling theodolite or a phone-based AR level (cheap and good enough for a feasibility pass, not for final installation). For maximum accuracy on irregular terrain, hire a surveyor for half a day — it will cost two to four hundred dollars and you will get a stamped drawing that the permitting office will accept.

What you actually need:

• Gross head = upstream water surface elevation minus tailrace water surface elevation, at design flow
• Net head = gross head minus inlet headloss minus outlet headloss; for a GWVPP both are small (clean open-channel geometry), so net head is typically 90 to 95 percent of gross head

Measure at both low-flow and high-flow conditions if your stream is seasonal. The variation matters for turbine selection.

Measuring flow

Three methods, in order of cost and accuracy:

Float method (free). Find a straight section of channel with roughly uniform cross-section. Measure the cross-sectional area at three points along a 10-meter stretch by sounding depth at evenly spaced intervals across the width and integrating (sum of width-times-depth pairs). Average the three areas. Drop a partially-submerged float (an orange works) at the upstream end and time it to the downstream end with a stopwatch. Repeat ten times and average. Surface velocity is distance divided by time. Mean channel velocity is roughly 0.85 times surface velocity for natural channels. Flow Q = mean_velocity * mean_area. Accuracy: roughly plus or minus 25 percent. Good enough for first-pass feasibility.

Weir method (~$50 in lumber). Build a sharp-crested rectangular or 90-degree V-notch weir across the channel. Wait for steady-state, measure the head over the weir crest with a staff gauge upstream of the weir. Use the standard weir equations:

For a sharp-crested rectangular weir of crest length L (meters) with head H (meters):

Q = 1.84 * L * H^1.5    (cubic meters per second)

For a 90-degree V-notch weir:

Q = 1.4 * H^2.5    (cubic meters per second)

Accuracy: 5 to 10 percent when built and read correctly. This is the method used by most professional micro-hydro feasibility studies.

Ultrasonic flow meter (~$300+). Strap-on transit-time meter clamps onto a section of pipe if your inflow is piped, or use an open-channel ultrasonic level sensor at a known weir. Accuracy: 1 to 3 percent. Overkill for a single-site DIY build, justified if you are sizing multiple installations.

Important — measure seasonally. Take readings in spring high-flow, summer baseflow, and autumn low-flow at minimum. Size your turbine to baseflow if you want 24/7 continuous output, or to mean flow if you can accept seasonal variation. Sizing to peak flow wastes capacity for ten months of the year.

Basin geometry: the shape that makes the vortex

The GWVPP basin is hyperbolic in cross-section, circular in plan. The hyperbolic curve is what generates the stable free vortex without cavitation. A simple cylindrical or conical basin will work, badly. A correctly hyperbolic basin will hit the peer-reviewed efficiency range.

Sizing the basin

The key dimensional ratios, refined across two decades of academic and commercial practice:

• Basin diameter D_b = the design choice; everything else scales from this
• Outlet (drain) hole diameter D_o = 0.14 to 0.18 times D_b. Lower for higher head, higher for higher flow.
• Basin depth H_b = 0.4 to 0.6 times D_b
• Inlet channel width W_i = approximately 0.5 to 0.7 times D_b
• Inlet channel depth at basin entry = roughly 0.4 to 0.5 times design head

Rough rule for basin diameter given design flow:

D_b (meters) ~ 2.5 * sqrt(Q)    (Q in cubic meters per second)

So Q = 0.5 m^3/s gives D_b ~ 1.77 m. For our 1.5-meter-head, 0.5-cubic-meter-per-second worked example, that gives a basin roughly 1.8 meters in diameter, with a drain hole of about 0.27 to 0.32 meters and a basin depth of around 0.75 to 1.0 meter.

The hyperbolic profile

In cross-section, the inner wall follows the curve:

r(z) = r_o * (H_b / z)^0.5

Where r(z) is the radius at depth z below the rim, r_o is the radius at the rim, and H_b is the total basin depth. In practice for a DIY build, you approximate this with three or four straight conical sections joined at increasing slopes, or you cast it directly using a rotating screed mounted on a center pivot.

The simplest production method for a homebuilder: build a wooden form following the curve as a sectional profile, plaster-coat the inside, and use it to wet-cast the concrete basin in place. Total form-building time: a weekend with two people and basic carpentry tools.

Inlet geometry — this is where most DIY builds fail

The water must enter the basin tangentially, not radially. The inlet channel approaches the basin along a line that is tangent to a circle of radius equal to the rim radius, then transitions smoothly into the basin wall. If you bring water in radially, you get a confused unstable swirl instead of a clean vortex, and your efficiency drops to 20 to 30 percent.

The inlet channel should be straight and free of obstructions for at least three to four channel widths upstream of the basin, so the flow enters the basin already laminar and uniform.

A common DIY mistake is to route the inlet through a 90-degree elbow immediately before the basin. Don’t. Build the inlet straight, tangent, and clean. This single detail moves you from 30 percent efficiency to 65 percent efficiency.

Materials list for a 5 kW build (1.5 m head, 0.5 m³/s flow)

This is the bill of materials for the worked example — a 1.8-meter-diameter basin producing approximately 5 kilowatts continuous. Prices are 2026 USD, rounded.

Basin and civil works

• Cement (50-pound bags), approximately 40 bags: $300
• Sand and gravel (cubic yards), 2 cubic yards: $80
• Rebar (#4, 20-foot lengths), 30 sticks: $240
• Form lumber (3/4” plywood + 2x4 framing): $200
• Concrete sealer (acrylic or epoxy, for inside surface): $80
• Inlet channel concrete or HDPE pipe section: $250
• Outlet/tailrace concrete or stone work: $150

Subtotal civil: $1,300

Turbine runner

• Vertical-axis runner, custom: $800 to $1,500 fabricated, or roughly $400 in materials (3mm stainless or galvanized steel sheet + welded blades) for a DIY fabrication
• Shaft (1.5-inch stainless steel, 1.5-meter length): $180
• Two sealed marine pillow-block bearings: $120
• Coupling between turbine shaft and generator shaft: $60

Subtotal turbine: $1,160 to $1,860

Generator (PMA — permanent magnet alternator)

• Hugh Piggott-style axial-flux PMA, 5 kW class, 50-100 rpm rated: $1,200 to $1,800 ready-made (Missouri Wind & Solar, WindyNation, or similar); or $600 in materials if you wind it yourself following Piggott’s open-source plans
• Rectifier bridge (3-phase, 100A, 600V): $80
• DC cable to controller (4 AWG, 50 feet): $150

Subtotal generator: $1,430 to $2,030

Controller, batteries, inverter (off-grid scenario)

• Diversion-load charge controller (Morningstar TS-MPPT-60 or Midnite Classic 150): $700 to $900
• Dump load resistors (sized to absorb peak generation, typically 6 kW worth): $200
• Battery bank (24V or 48V, lithium iron phosphate, 10 kWh): $2,500 to $4,000
• Inverter (Victron MultiPlus or similar, 5 kW): $1,800 to $2,500

Subtotal off-grid electrical: $5,200 to $7,600

Grid-tie scenario (instead of batteries + inverter)

• Grid-tie inverter (Enphase IQ8 or SMA Sunny Boy 5.0 with DC input conditioning): $1,800
• Disconnect switch (60A, lockable): $120
• Utility-required meter and interconnect hardware: variable by utility, typically $300 to $1,500
• Permit and interconnection fees: $400 to $2,000

Subtotal grid-tie electrical: $2,620 to $5,420

Totals

• Full off-grid 5 kW system, DIY-heavy: roughly $8,000 to $10,000 all-in
• Full grid-tie 5 kW system, DIY-heavy: roughly $6,000 to $8,500 all-in
• Same systems with everything contractor-installed: add 30 to 60 percent

Payback at $5,000/year offset: roughly 1.6 to 2.5 years off-grid, 1.2 to 1.7 years grid-tie. After payback the energy is approximately free for the operating life of the system, which for a well-built GWVPP is 25 to 40 years on the civil works and 15 to 20 years before the generator needs bearings serviced.

Turbine runner: geometry and DIY fabrication

The runner is a vertical-axis turbine sitting inside the vortex column. Several blade geometries work; the two most common are:

Straight-bladed vertical runner. Four to six flat blades, slightly canted (5 to 10 degrees from vertical), arranged radially around a central hub. Easy to fabricate from sheet steel. Efficiency: roughly 60 to 65 percent of basin efficiency, which gives system efficiency in the 0.6 range.

Curved-bladed (Zotlöterer-style) runner. Blades follow a logarithmic spiral matching the vortex streamlines. Higher efficiency (system efficiency in the 0.7 range), more complex to fabricate. Worth it if you have access to a CNC plasma cutter or are willing to template carefully and hand-fabricate.

Runner sizing for our worked example

• Basin diameter D_b = 1.8 m
• Outlet hole D_o = 0.30 m
• Runner diameter = approximately 0.45 to 0.55 times D_b = roughly 0.85 m
• Runner height = approximately 0.6 to 0.8 times basin depth = roughly 0.5 m
• Number of blades: 4 (simple), 6 (smoother torque), 8 (highest efficiency, more fabrication work)
• Blade material: 3mm stainless or 4mm galvanized steel
• Shaft offset from center: zero (runner is concentric with vortex axis)
• Design rotational speed at rated head and flow: roughly 40 to 60 rpm

DIY fabrication procedure (straight-bladed runner)

1. Cut four trapezoidal blades from sheet steel, dimensions roughly 200 mm wide at the top, 350 mm wide at the bottom, 500 mm tall.
2. Cut a central hub plate (300 mm diameter) and a top retaining plate (300 mm diameter), both with a 38 mm center hole for the 1.5” shaft.
3. Weld blades vertically to the hub plate at 90-degree spacing, each canted 8 degrees in the direction of rotation.
4. Weld the top retaining plate on, with corresponding 8-degree angles.
5. Bore-and-key or weld the assembly onto the shaft.
6. Static balance the assembly on knife edges before installation. Add small steel tabs welded near the imbalance until it rests indifferently at all rotations.

Total fabrication time: one to two weekends with a stick or MIG welder, a drill press, and an angle grinder.

Generator: the permanent magnet alternator

The PMA is the canonical low-rpm generator for micro-hydro and small wind. Hugh Piggott has been publishing open-source axial-flux PMA designs since the 1990s and the design is fully proven. Pre-built units are also available from Missouri Wind & Solar, WindyNation, Pacific Sky Power, and several Chinese suppliers via Alibaba.

Why a PMA

Permanent magnet alternators produce three-phase AC at a voltage and frequency proportional to rotational speed. At 40 rpm a typical 5 kW PMA produces roughly 50 to 80 volts AC line-to-line at 5 to 10 Hz. You rectify this to DC, feed it into a charge controller or DC-input grid-tie inverter, and you have power.

PMAs are happy at low rpm (no gearbox required), produce useful power across a wide speed range, and have no field-coil losses. They are the right answer for vortex hydro almost without exception.

Wiring overview

Turbine shaft -> PMA (3-phase output)
              -> 3-phase rectifier bridge
              -> Smoothing capacitor (optional, helps controller behavior)
              -> Diversion-load charge controller
              -> Battery bank
              -> Inverter
              -> AC load / grid

The diversion-load controller is critical. A PMA driven by a vortex turbine never stops spinning unless you mechanically brake it or short the windings. When the battery is full, the controller dumps excess power into a resistive load (water heater element, space heater, or dummy resistor bank) to maintain back-EMF on the generator and keep it from over-spinning.

Never disconnect a PMA under load without a dump path. The generator will runaway and either destroy bearings, fly the runner, or both. The controller and dump load are not optional safety equipment, they are the only way the system stays sane.

Wiring schematic (ASCII)

                   PMA 3-phase
       Phase A o-------+---+---+----+   Battery bank
       Phase B o-------+---+---+----+----[Charge Controller]----+--- (+)
       Phase C o-------+---+---+----+                            |
                       |   |   |                                |
                  [Bridge Rectifier]                            |
                       |                                        |
                      ===  (smoothing cap, optional)            |
                       |                                        |
                       +-->>--[Diversion Dump Load Resistor]<--+--- (-)

The 3-phase bridge rectifier handles all three phases simultaneously. Use a 100-amp, 600-volt rated unit on a heatsink for a 5 kW class system. The bridge dissipates roughly 1 to 2 percent of throughput as heat — at 5 kW that is 50 to 100 watts continuous, which is a noticeable heatsink load. Plan accordingly.

Controller, batteries, inverter

For an off-grid build with a battery bank:

• Charge controller: Morningstar TriStar TS-MPPT-60 (60A) for systems up to 6 kW at 24V, or up to 12 kW at 48V. The TS-MPPT supports diversion-load mode out of the box. Midnite Classic 150 is the other strong choice in this class.
• Battery bank: LiFePO4 (lithium iron phosphate) is the right answer for new builds in 2026. 24V or 48V bank, 10 to 20 kWh capacity sized to cover overnight loads with margin. Battle Born, EG4, or SOK are reputable suppliers.
• Inverter: Victron MultiPlus-II or EG4 18kPV for hybrid grid-interactive operation; Victron Quattro for pure off-grid. Size at roughly 1.5 to 2 times your continuous generation, so 7 to 10 kW inverter for a 5 kW source.

For a grid-tie build:

• The DC output of the rectifier feeds into a string inverter that accepts wide-range DC input. The Enphase IQ8 series, SMA Sunny Boy, or Sol-Ark 15K all work; check the DC input voltage and current windows against your rectified PMA output.
• You will need a utility interconnection agreement, a UL 1741 compliant inverter, a lockable AC disconnect, and possibly a production meter depending on jurisdiction.
• In states with net metering, every kilowatt-hour you push to the grid earns you a credit at retail rate (or close to it). In states without net metering, you may only get wholesale rate (3 to 5 cents per kWh) for exported energy, which changes the economic calculation considerably.

Permits: this is the actual hard part in the US

The build is engineering. The permit is bureaucracy. Plan for the permit to take longer than the build.

Federal (FERC)

In the United States, all hydroelectric projects on navigable waters or waters of the United States are subject to FERC jurisdiction. For very small projects there are streamlined paths:

• FERC Conduit Hydropower Exemption (under 5 MW, on existing artificial conduits like irrigation canals or municipal water pipes): minimal FERC involvement, typically a notice-of-intent filing.
• FERC Small Hydroelectric Exemption (under 10 MW, on existing dams): exemption from licensing but requires consultation with resource agencies.
• Qualifying Conduit Hydropower Facility notification (under 5 MW, conduit-based): a 60-day notice, no license required, easiest path.
• For a true greenfield install on a free-flowing stream: you generally need a full FERC license unless the project is under 10 kW AND not on navigable waters AND not crossing state lines AND not affecting federally protected species. In practice, most DIY GWVPP installs target either an existing irrigation drop (conduit exemption) or a sub-10kW free-flowing install with no federal nexus.

Practical advice: call your FERC regional office before you build anything. They are surprisingly helpful and will tell you what path your specific project fits into. The contact info is on the FERC website.

State and local

• Water rights / riparian rights. Every state has its own water law. Western states use prior appropriation (you have to hold a water right to use water, even briefly). Eastern states use riparian rights (you have rights as a landowner adjacent to the water). Check your state’s water rights agency before assuming anything.
• Army Corps Section 404 permit. Required for any work that places fill in or dredges navigable waters of the US. Most GWVPP installs disturb enough streambank to trigger this. Nationwide Permit 17 (Hydropower) often covers small installs.
• State environmental review. California has CEQA, Washington has SEPA, most states have an equivalent. Small projects often get categorical exclusions but you have to apply for them.
• Local building permit and zoning. The basin is a structure. The electrical wiring is electrical work. Both require local permits in most jurisdictions.

Tribal lands, federal lands, conservation easements

These add complexity. Tribal lands require coordination with the tribal government. Federal lands (BLM, USFS) require special-use permits. Conservation easements may explicitly prohibit hydroelectric installations — read your easement.

The realistic timeline

For an off-grid, sub-10 kW install on private land using an existing irrigation drop or mill race, with no federally protected species in the watershed: 3 to 9 months of permitting.

For a grid-tied install requiring utility interconnection: add 2 to 4 months for the interconnection study and approval.

For anything on a free-flowing stream with potential ESA-listed species: 1 to 3 years and likely a hired consultant who specializes in small hydropower.

This timeline is the single biggest barrier to GWVPP deployment in the United States. It is also why the architecture is far more deployed in Europe, Southeast Asia, and Central America — the permit regime is dramatically lighter, and in many countries small-hydro permitting can be done in weeks.

Commercial alternatives if you do not want to DIY

If reading “weld trapezoidal blades from 3mm stainless” caused you to break out in hives, several companies sell turnkey GWVPP units in the 1 to 200 kW range:

• Turbulent.be (Belgium) — 100+ installations across 20+ countries. Container-shippable units, comprehensive engineering support, ten-year warranty. Their smallest unit is roughly 15 kW; cost is in the 30,000 to 80,000 EUR range installed depending on site complexity.
• GWWK Zotlöterer (Austria) — the original inventor’s company. Custom-engineered installations, primarily European market. Higher price point, highest engineering quality, decades of operational data.
• Vortex Hydro Energy (Michigan, USA) — smaller US-market focus, units in the 5 to 50 kW range.
• Several Asian and South American manufacturers — variable quality, much lower prices (often 20 to 40 percent of European equivalents), longer lead times for parts. Do your homework on warranty and support.

For a fully turnkey install in the US, expect to pay roughly $4,000 to $8,000 per installed kilowatt for small (sub-25 kW) systems, dropping to roughly $2,500 to $4,000 per installed kilowatt for larger (50+ kW) systems. The DIY build cuts the lower end roughly in half on materials but adds your labor.

What does NOT survive subtraction

Honest disclaimers, the substance_lens read:

• Over-unity is not happening. No vortex device produces more energy than the hydraulic head provides. Schauberger’s lifelong “implosion engine” claims have never been replicated. Conservation of energy holds.
• “Living water” is not a stand-alone electricity source. Vortex flow does cause measurable changes in dissolved oxygen, temperature, and mineral structure. Those changes have real effects on water quality and biology. They do not generate watts.
• The Repulsine flying disc does not exist. No surviving working unit, no replicable demonstration, no functional drawings published. The Mauthausen-era work was real conscript labor under coercion, the engineering output was undemonstrated, and the post-war “Nazi UFO” lore is frame, not kernel.
• “Suppressed by the oil industry” is wrong. GWVPP units are commercially available right now in twenty-plus countries. No suppression has occurred. The reason the architecture is not deployed in every American watershed is regulatory friction (FERC, state water rights, ESA review), capital cost vs. residential solar (rooftop solar got cheaper faster), and lack of public awareness. Not a conspiracy.
• Hugh Piggott’s PMA designs are not Tesla’s “free energy” devices. They are well-engineered axial-flux generators with documented losses and finite efficiency. They are very good. They are not magic.

What is real: the vortex basin extracts gravitational potential energy from falling water with 50 to 83 percent efficiency, on heads where nothing else economically can, while passing fish unharmed. That is enough.

A reading list for going deeper

Engineering and academic:

• Power, C., McNabola, A., and Coughlan, P. (2016). “A parametric experimental investigation of the operating conditions of gravitational vortex hydropower.” Renewable Energy, 97, 658–668.
• Dhakal, S., Timilsina, A. B., Dhakal, R., Fuyal, D., Bajracharya, T. R., Pandit, H. P., Amatya, N., and Nakarmi, A. M. (2015). “Comparison of cylindrical and conical basins with optimum position of runner: Gravitational water vortex power plant.” Renewable and Sustainable Energy Reviews, 48, 662–669.
• Zotlöterer, F. Original technical descriptions and patents available via gwwk.at.
• The European Small Hydropower Association’s “Guide on How to Develop a Small Hydropower Plant” — comprehensive, free PDF, applies fully to GWVPP siting.

DIY and practical:

• Piggott, H. A Wind Turbine Recipe Book — the canonical open-source PMA build guide. The PMA design transfers directly to vortex hydro.
• Hartvigsen Hydro and the homepower.com archive for first-person micro-hydro install reports.
• Turbulent.be’s case study archive for real-world performance data across multiple climates and site types.

On Schauberger (the kernel-vs-frame separation):

• Bartholomew, A. Hidden Nature: The Startling Insights of Viktor Schauberger — the most readable English-language overview, leans warm but does separate the engineering observations from the metaphysics.
• Coats, C. Living Energies — deeper dive, more vitalist framing; useful for the historical primary-source citations.
• Read both with the substance_lens active: the vortex geometry survives, the implosion-engine claims do not.

Closing

The single biggest insight from Schauberger’s career — that water moving in a coherent vortex behaves differently and more efficiently than water moving in turbulent or linear flow — became the Gravitational Water Vortex Power Plant. The basin, the runner, the slow rotation, the fish passage, the ultra-low head economics. Built by Zotlöterer in 2004, refined by academics across two decades, commercialized by a dozen companies, deployed in thousands of installations worldwide.

You can put one in a creek this summer.

The over-unity engine that Schauberger spent his last twenty years chasing does not exist. The patent that he claimed the Nazis stole, the disc that the Americans seized, the secret water-fuel cell — none of it. The kernel of his work — the part that replicates, the part that produces measurable continuous electricity — is a hyperbolic basin with a hole in the bottom and a slow vertical turbine inside the vortex column.

That is the lesson, and that is also the prize. The real thing is enough. Build it.

All code, diagrams, and reference values in this manual are released to the public domain — copy, modify, ship freely. If you build one, send us photos and your performance data. We will publish them.