Isotope Hydrology — Five Percent Imperfect

Five Percent Imperfect · Water & Environment

Complete Course on
Isotope Hydrology

Master the science of tracing water using environmental isotopes — from stable isotope fractionation to groundwater age dating and paleoclimate analysis. All lectures, completely free.

Stable Isotopes Groundwater Tracing Tritium Dating Rayleigh Distillation Meteoric Water Lines Hydrograph Separation Vostok Ice Core Recharge Estimation

▶ Watch Free Lectures Get the Course Deliverables →

Our Philosophy

Education is free. Excellence is earned.

We believe foundational knowledge should belong to everyone. Every concept, every theory, every lecture — free, forever, on YouTube. The premium deliverables exist for those who want to go further and do the work.

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100% Free Video Lectures

Every lecture in this course is available on YouTube at zero cost. No login, no paywall, no strings attached. Just open it and start learning.

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Premium Calculation Tools

8 Excel calculators and 7 PDF guides built for real-world isotope hydrology projects. These are paid because creating them takes serious effort — and effort deserves appreciation.

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No Subscriptions, Ever

Buy the deliverables once and keep them forever. Use them for your thesis, research, or consulting work with no time limits or renewals.

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Transparent Logic

Every Excel file includes a step-by-step logic guide. No black boxes — just clear, auditable engineering you can trust and understand.

Course Playlist

All Lectures — Free on YouTube

Click any lecture below to watch it directly on YouTube. The entire playlist is free — no account needed to view.

Introduction to Isotope Hydrology

Foundations · What are environmental isotopes & why they matter

Free 02

Rayleigh Distillation

Isotopic fractionation · Equilibrium vs kinetic processes

Free 03

Local Meteoric Water Lines (LMWL)

δD vs δ¹⁸O plots · Deviation from GMWL · Regional signatures

Free 04

Advanced Hydrograph Separation

Baseflow vs storm runoff · Two- and three-component mixing

Free 05

Lake Evaporation Modelling

Craig-Gordon model · Isotopic enrichment in surface waters

Free 06

Tritium in Groundwater

Tritium as a hydrological clock · Recharge estimation · Diagnostic matrix

Free 07

Groundwater Age Dating

¹⁴C, ³H/³He, CFCs · Decision matrix for tracer selection

Free 08

Vostok Ice Core Analysis

Palaeoclimate proxies · δD record · Glacial–interglacial cycles

Free

▶ Open Full Playlist on YouTube

Premium Deliverables

15 Tools to Execute Like a Pro

The videos teach you the theory. The deliverables let you apply it. Eight Excel calculators and seven PDF guides — the actual tools used in industry-grade isotope hydrology projects.

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Featured · Calculator

Tritium Groundwater Calculator (XLS)

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Calculator

Rayleigh Distillation Simulator (XLS)

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Calculator

LMWL Isotope Hydrology Template (XLS)

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Calculator

Advanced Hydrograph Separation (XLS)

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Calculator

Lake Evaporation Calculator (XLS)

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Calculator

Vostok Ice Core Exercise (XLS)

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Guide

Rayleigh Distillation PDF Guide

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Guide

LMWL User Guide (PDF)

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Guide

Lake Evaporation Guide (PDF)

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Guide

Tritium Diagnostic Matrix (PDF)

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Guide

Groundwater Age Dating Decision Matrix (PDF)

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Guide

Vostok Ice Core Guide (PDF)

Complete Bundle — 15 Tools

Everything you need to go from classroom theory to field-ready computation. One purchase, lifetime access.

8 Excel Calculators & Simulators
7 Step-by-Step PDF Guides
Built-in logic documentation in every sheet
Suitable for thesis, research & consulting
Immediate digital download, lifetime access
Free video lectures included (watch on YouTube)

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One-time · No subscription

Get the Course Deliverables →

"The lectures are free because knowledge should have no gate. The deliverables are paid because creating professional tools takes real effort — and if they save you hours of work, appreciating that effort is a small and fair thing."

— Five Percent Imperfect

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