Lecture 1 Part 1

Instructor Background & Course Philosophy

• Lecturer left school in Year 10, joined the Royal Australian Air Force as an apprentice and spent ≈ 6 years at Amberley servicing aircraft (F-111s, Iroquois, Chinooks).
• Completed Years 11–12 at night school (TAFE) and commenced an engineering degree part-time at QIT before switching to full-time study.
• Earned a doctorate in Townsville and pursued research with CSIRO, DPI and the (former) Queensland Department of Primary Industries.
• Extensive consulting career; has lectured at UQ since 2002.
• Teaching ethos: create “informed consumers” of hydrology—students who can commission, review or approve hydrological studies and detect poor-quality work or “charlatans.”
• Goal is for everyone to master the content ("I’ll be delighted if you all get HDs"). High lecturer availability via personal email and in-class help, but students must put in the work.

Student Context & Course Goals

• Typical cohort backgrounds: Science, Environmental Management, Engineering.
• Student aims often include passing courses and finishing degrees/HECS, but this subject positions them to take action on environmental issues, not just discuss them.
• Major assessment is written as a consultant’s report that delivers actionable advice rather than a purely descriptive scientific paper.

Course Structure

1. Lectures – conceptual framework, real-world imagery, schematics.
2. Practical Classes (Pracs) – hands-on skills that directly feed the assignment.
3. Assignment – authentic consulting task requiring data sourcing, analysis and recommendations.

Assignment Overview & Tips

• Start early; do not leave until final week. Real-world obstacles such as data-portal outages are built in to simulate environmental practice.
• Requires downloading hydrological data, delineating a catchment, running calculations, and writing advice.
• First four pracs teach every technical step; don’t miss them. Spreadsheets supplied by the lecturer automate complex calculations—just replace numbers.
• The catchment-drawing exercise you perform today mirrors the very first task in the assignment.

Practical Sessions (Pracs)

• Focus on operational skills (data download, GIS or mapping package use, spreadsheet models, simple parameter input).
• If you cannot complete a prac, resolve the issue immediately; the identical challenge will appear in the graded assignment.

Lecture Style & Communication

• Large slide decks heavy on photographs of actual field conditions (mine sites, golf courses, tropical catchments, granite mountains, etc.) to contrast with textbook schematics.
• Pace is fast; unfinished material rolls into the next week.
• Contact via personal email (listed on course site) for quick replies. UQ email may go unanswered for a week or more.

Six-Week Topic Schedule

Reference & Data Resources

• Tony Ladson, “Introduction to Hydrology” – Australian text, electronic copy in UQ library; excellent general reference.
• Australian Rainfall and Runoff (ARR) – comprehensive, freely available online; authoritative on flooding. Chapter 1 offers gold-standard background statements useful for professional arguments.
• Bureau of Meteorology (BoM) Hydrological Data Hub – rainfall, streamflow, soil-moisture grids. National collation mandated after the first State of the Environment report (≈ 1999). Single portal eliminates disparate state/agency datasets.

Key Definitions

• Hydrology: science of water above, on and within the land surface; studies the time- and space-varying behaviour of rainfall, evapotranspiration, soil moisture, floods, droughts and catchment response.
• Hydraulics (environmental context): physics of water movement through pipes, channels or natural streams. In flooding work, hydrology yields the runoff volume while hydraulics determines flow paths and inundation depths.
  • Note: course is hydrology-centric; advanced hydraulics mathematics kept to a minimum, with spreadsheet support where needed.

Hydrological Cycle & Flow Paths

(Starred content → examinable)

Atmosphere ↓ (precipitation)
Soil Surface
├── Overland Flow (Surface Runoff)
├── Sub-surface Flow (Interflow)
├── Baseflow (to streams & springs)
└── Groundwater Recharge (to aquifers)

1. Overland Flow
   • Sheet flow only a few millimetres deep; common across roads, carparks, short-grass lawns.
   • Requires intense rainfall; ceases almost immediately once rain stops.
2. Sub-surface Flow / Interflow
   • Occurs within upper 0.3–1 m of soil—root holes, macropores, animal burrows.
   • Responds quickly (hours–days); lags behind rainfall but faster than baseflow.
3. Baseflow
   • Sustained discharge that keeps streams flowing without rainfall.
   • Water percolates deeper, may travel days to 10 000 years before emerging.
   • Emergence points vary: channel beds, hillslopes, coastal ocean floor, etc.
   • Perennial vs. ephemeral streams controlled largely by baseflow magnitude (e.g., Mount Coot-tha ≈ no baseflow vs. North QLD perennial rivers).
4. Groundwater Recharge
   • Infiltration that replenishes regional aquifers (e.g., Great Artesian Basin).
   • Appears “lost” in catchment water balance but ultimately re-emerges once the aquifer is full, historically forming marshes and springs used by Indigenous Australians.

Mass-Balance (Water-Budget) Equation

The catchment water balance can be expressed simply as
P - E - I - \Delta S = Q
where
• P = precipitation (rainfall/snow),
• E = evaporation/evapotranspiration,
• I = infiltration lost to deep recharge,
• \Delta S = change in soil-water storage,
• Q = runoff (sum of surface, interflow and baseflow components).
Appears straightforward, but each term is notoriously difficult to measure independently.

Real-World Illustrations of Flow Paths

1. Brisbane, Feb 2022 flood – video shows classic sheet (overland) flow across lawns, driveways and streets during intense rainfall.
2. Road exfiltration at lecturer’s home – days after rainfall, water issues from cracks in a sloping suburban road; demonstrates pressurised interflow/baseflow moving downslope beneath the surface before daylighting.
3. Near-summit spring, Mount Coot-tha – hillside seepage ~50 m below the summit gushes visibly despite no rain, evidencing interflow/baseflow emergence high on the slope; multiple emergence points possible along the hillslope continuum.
4. Springs as cultural water sources – perennial springs historically provided reliable water for Indigenous communities and dictated settlement patterns.

Ethical & Professional Context

• Hydrology is data- and practice-rich, but also harbours “charlatans.” Graduates need critical skills to scrutinise reports and defend evidence-based decisions.
• ARR’s open-access status plus publicly available BoM datasets empower transparent, defensible analyses—important for consultancy and regulatory assessments.
• Assignments mirror consultancy reality: incomplete data, website downtime, and deadline pressure, underscoring professional resilience and planning.