Grade 8 · Science · 35 minutes
Unit 3 · Earth Patterns and Design Decisions · Lesson 2 of 2
Choose and Improve a Stormwater Plan
Combine design constraints, uncertain results and monitoring in an environmental recommendation.
Mr. S Teaches · Original starter mini-lesson · MS8-SCI-06Learning objective
Recommend and revise a stormwater design using at least three measures and a testable monitoring plan.
Before you begin
- Understand runoff, criteria, constraints and mean values.
Gather your materials
- Paper or notebook
- Pencil and the passage, model directions or data printed in this lesson
Language to know
- optimization
- Improving a design according to defined priorities and limits.
- feasibility
- Whether a proposal can realistically be carried out.
- baseline comparison
- Comparing outcomes with a stated starting condition.
Understand the concept
Fictional site brief: A school has a 20-token budget and needs at least 30% lower outlet runoff in comparable model storms. A rain garden costs 18, needs 5 maintenance hours monthly and reduces runoff 40% in tests; permeable paving costs 20, needs 2 hours and reduces it 32%; a storage tank costs 14, needs 3 hours and reduces it 25%. Maintenance capacity is 3 hours monthly. Results are model averages, not guarantees. Monitoring must record storm inputs as well as outflow.
Teach it step by step
- Read the brief and set budget, maintenance and minimum runoff reduction as separate requirements.
- Build a matrix, eliminating options that fail a required limit rather than hiding failures in a single score.
- Choose a feasible starting design, then propose a modification and identify which results would need new tests.
- Draft a monitoring plan using comparable rainfall, a baseline and repeated measurements; explain uncertainty near a threshold.
Make the thinking visible
Worked example or model response
Permeable paving meets the stated limits: 20 tokens, 2 hours and 32% reduction. The rain garden exceeds maintenance capacity, while the tank misses the reduction minimum. Paving exceeds the runoff minimum by only two percentage points, so uncertainty and repeat testing matter before a real installation.
Guided practice
Together explain why the 40% result does not automatically make the garden feasible. Then identify a change in the brief that could make it an option.
Independent practice
Write a recommendation with numerical evidence for all three requirements. Propose one revision to either the garden or tank, a retest and a plan for comparing normalized runoff before and after installation.
Quick assessment
Why could a low-rainfall week after installation create a misleading success claim?
Answer key & assessment criteria
Answers and teaching guidance
- Guided: The garden needs 5 maintenance hours while only 3 are available. More maintenance capacity or a tested lower-maintenance revision could change feasibility.
- Independent: Paving is the only currently qualifying option. Revision proposals must check all limits again, monitor input rain and outflow and use repeated comparable conditions.
- Quick check: Less rainfall can lower runoff even without an effective design; inputs must be accounted for.
Look for: Look for a claim that answers this lesson’s question, accurate use of the supplied evidence and an explanation of a limit or alternative. Ask the learner to point to the detail supporting each inference.
Make it work for your learner
More support
Provide a three-limit checklist and sentence frames for “meets,” “fails” and “needs retesting.”
Extension challenge
Add estimated uncertainty of ±5 percentage points to runoff reductions; explain why a 32% average alone would then provide weak assurance of exceeding 30%.
Selected contributions · Official sources
Standards connections
Selected NGSS band contribution; not complete performance expectation coverage.
Contributes to NGSS performance expectation
MS-ETS1-2NGSS · Grades 6–8 band
Compare designs systematically against agreed criteria and constraints.
Read the official performance expectation ↗This systematic paper evaluation uses model data and proposes further tests. It does not establish real-site effectiveness, construction feasibility or a fully optimized solution.
Source and mapping checked 2026-11-04. This mini-lesson contributes selected skills; it does not claim full attainment.
Supporting Common Core literacy connection
RST.6-8.7Common Core · Grades 6–8
Connect scientific prose with a diagram, model or table.
Read the official standard ↗The provided scientific passage/model is explicitly analyzed in the activity. This selected literacy practice does not establish subject-content alignment or complete coverage of the standard.
Source and mapping checked 2026-11-04. This mini-lesson contributes selected skills; it does not claim full attainment.