Identify a drainage boundary
See this course’s project requirements
A fictional watershed diagram tracking runoff, infiltration, groundwater and pollution paths, with a supported upstream/downstream prevention choice.
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What to include
- Draw outlet-specific and nested drainage boundaries.
- Label water stores, phase changes and land/plant routes.
- Balance supplied rain budgets and compare fractions.
- Read groundwater/stream exchange cross-sections.
- Trace a possible pollution route without inventing treatment.
- Explain a responsible paper prevention choice and include all changed cases.
Review and revise
Use these criteria to check your work and choose what to improve.
- Method: applies the course-specific rules to the supplied cases with visible intermediate work.
- Accuracy: results agree with the stated facts, units, boundaries and independent checks.
- Reasoning: explains why the result follows and identifies a limitation or unresolved question.
- Transfer: completes changed cases and revises the final project when a relevant assumption changes.
Want more background?
The idea in everyday life
Fictional map description: ridge R separates west slopes flowing to Creek W from east slopes flowing to Creek E. Both creeks join River J downstream. Selected outlet is the mouth of Creek W before the junction. No actual terrain visit is required.
A surface watershed is the land area whose runoff drains toward a selected outlet. Ridges or other divides can separate runoff destinations. A watershed boundary depends on the outlet chosen: a small stream basin can lie within a larger river basin. Groundwater boundaries can differ from the simple surface divide.
Identify a drainage boundary — worked practice
A surface watershed is the land area whose runoff drains toward a selected outlet. Ridges or other divides can separate runoff destinations. A watershed boundary depends on the outlet chosen: a small stream basin can lie within a larger river basin. Groundwater boundaries can differ from the simple surface divide.
Fictional map description: ridge R separates west slopes flowing to Creek W from east slopes flowing to Creek E. Both creeks join River J downstream. Selected outlet is the mouth of Creek W before the junction. No actual terrain visit is required.
1. 1. Outlet
Mark the selected Creek W mouth.
You should see: The selected outlet is before Creek E joins River J.
2. 2. Trace
Follow supplied downhill surface arrows from west and east slopes.
You should see: West slopes reach W; east slopes reach E.
3. 3. Boundary
Draw the divide along ridge R for the selected W basin.
You should see: East-slope runoff is outside this chosen surface watershed.
4. 4. Nest
Change the selected outlet to River J after the junction.
You should see: Both creek basins are included in the larger watershed.
What to finish
Two outlet-specific watershed sketches with a surface-flow limit.
Watch for this
The supplied divide traces surface drainage. Subsurface geology and hydraulic conditions can create different groundwater flow patterns.
How can I tell I understand it?
Revise included basins when the selected outlet moves downstream.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
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Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
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