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Block 1: The Water Cycle in Detail + Reservoirs + Residence Times

Unit 5 · Block 1 of 9 ⏰ 80 minutes A: Wed Feb 24 · B: Thu Feb 25
Today builds toward:K/U KnowledgeT/T Thinking (preview)
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The Hydrologist
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Story

What today is about

Unit launch. One question runs through the whole unit: who owns the water?

That question only makes sense once you understand what water is, physically. The water cycle isn't trivia; it's the structure of the political problem. Today builds the cycle in detail: reservoirs (where water sits: atmosphere, soil moisture, rivers, lakes, groundwater, ocean, ice sheets) and residence times (how long water stays in each: atmosphere ~10 days, soil ~weeks-to-months, rivers ~weeks, lakes ~years, groundwater ~decades-to-millennia, ocean ~millennia, ice sheets ~tens of thousands of years).

Why residence time matters: it's why some water disputes are negotiable and others aren't. River allocations can be renegotiated: water cycles through fast. A depleted aquifer can't be renegotiated on human timescales; the water is gone for centuries. The Cauvery dispute (Tamil Nadu vs. Karnataka, the unit's anchor case) is fundamentally a fast-reservoir conflict (river allocation) layered on top of a slow-reservoir crisis (groundwater depletion across both states). Today opens that tension.

Concepts

Before you start the work

Start with the Interact: it is the day's anchor activity. The Watch and the Read set it up.

Placeholder
Watch (~6 min)
TBD: water-cycle reservoir + residence-time primer. Quantitative scale: students see "atmosphere ~10 days" next to "groundwater ~10,000 years" on the same diagram. The point: the cycle's timescales span 6 orders of magnitude.
Whole-class, projected.
Placeholder
Read (~8 min)
TBD: Cauvery dispute background: 3-page primer naming the dispute's history, the named parties (Tamil Nadu, Karnataka, Kerala, Puducherry, the Cauvery Water Disputes Tribunal, the Cauvery Water Management Authority), what's at stake.
Reference for the year's anchor case.
Placeholder
Interact (~25 min)
TBD: paired student-built water-cycle diagram activity. Label reservoirs, fluxes, residence times. The class consolidates the strongest paired diagram on the board. Sub-move: annotate which reservoirs feed the Cauvery system.
Pairs · the day's anchor activity.
Do

Today's work: choose one path

All four paths end with a labeled water-cycle diagram + an exit ticket connecting one reservoir to one Cauvery-dispute stakeholder. The path you pick is about how you build the diagram.

Learning Intention: I can describe the Cauvery dispute in 3 sentences, name at least 3 stakeholders affected by it, and pose 2 questions about water rights that the dispute raises.
A
Standard paired water-cycle diagram (default)
Pair work. Draw a labeled water-cycle diagram showing reservoirs, fluxes, and residence times. Use the vocabulary from the Read handout. Submit one diagram per pair.
Pairs · Default
B
Cauvery-specific diagram (stretch)
Same as Path A, but add the Cauvery basin's specific reservoirs: Krishna Raja Sagar (Karnataka), Mettur (Tamil Nadu), the groundwater aquifers beneath both states, the river itself, the delta wetlands. Arrows show inter-state flow. This is the diagram you'll reference in Block 4 and beyond.
Pairs · Stretch
C
Hydrologist consultation (choice)
Open the Hydrologist. Ask one specific question about a reservoir or residence time you're unsure about. Document the exchange. This is your first AI Doc entry for Unit 5.
Solo · Choice
D
Peer-help: residence time vs. flow rate (practice)
Often confused. Residence time is "how long water stays"; flow rate is "how fast water moves through." If the distinction is fuzzy, come to the peer-help table. Pair with a student who's solid. Ms. Jayanthi/Mr. Ignash floats.
Pairs · Practice

Open your Class Notebook and type today's entry header as Heading 2:

A: Feb 24 | U5 B1 | The Water Cycle in Detail + Reservoirs + Residence TimesB: Feb 25 | U5 B1 | The Water Cycle in Detail + Reservoirs + Residence Times

Show

What you're submitting today

One reservoir + one residence time + one stakeholder connection. Specificity is the bar.

Exit ticket: reservoir + residence time + stakeholder claim

Three things: (1) name a water reservoir in the Cauvery basin · (2) state its approximate residence time · (3) identify one Cauvery-dispute stakeholder whose claim depends on that reservoir, and why. Generic ("groundwater" / "long" / "farmers") doesn't clear the bar. Specific is the move: e.g., "The shallow aquifer beneath the Cauvery delta has a residence time of decades. Tamil Nadu delta rice farmers depend on it for dry-season irrigation; depletion is irreversible on the timescale of their livelihoods."

Submit via Google Classroom →

Rubric link: Specific reservoir + residence-time + stakeholder linkage is K/U bedrock for the Water Stakeholders Map + Position Paper. The K/U 7-8 band requires "specific stakeholders"; that practice starts today. See the rubric.

Reflect

One question before you leave

Three to five minutes. Your answer is saved to your reflection journal, where you can read back everything you have written this year.

Honest is more useful than confident.

Today's reflection is in Google Classroom, under Reflection Journal.

Link posted in August

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