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Solton Roof Challenge

A civil engineering unit focusing on Chapter 1 of the Futura Dossier, where students analyze municipal requests for proposals, distinguish criteria from constraints, and evaluate urban climate solutions for Solton, Arizona.

AAndrea.Golden

Solton Roof Challenge

A civil engineering unit focusing on Chapter 1 of the Futura Dossier, where students analyze municipal requests for proposals, distinguish criteria from constraints, and evaluate urban climate solutions for Solton, Arizona.

AAndrea.Golden

Partial Credit (1 pt): Mentions roofs are old or look different, but fails to explain street visibility.

Futura Engineering • Answer Key & Evaluation Guide Page 1 of 2

Futura Civil Engineering • Instructor Scoring Key

Part 3 & Part 4 Grading

3

Part 3: Classification Solutions (5 pts • 1 pt each)

Requirement / StatementAnswerEngineering Rationale
A. Must not make major structural changes (roof shape/direction).ConstraintFixed limitation; structural changes are strictly prohibited.
B. Reduce the city's climate impact / cut CO2 as much as possible.CriterionCore goal used to score and evaluate design success.
C. Roof modifications include only white roofs and solar roofs.ConstraintDefines the closed boundary of allowed technology types.
D. Keep total project costs as low as possible.CriterionDesirable financial standard to optimize (not a hard spending cap).
E. Must not involve cutting down any trees.ConstraintNon-negotiable environmental restriction set by Solton.

4

Part 4: Scenario Analysis & Rubric (6 pts • 2 pts each)

  1. Two Constraints Violated (2 pts • 1 pt each): Objective Key
  • Violation 1: Rebuilding roof trusses to tilt panels southward violates the constraint against making major structural changes to the buildings (such as changing the shape or direction of the roof).
  • Violation 2: Removing mature shade trees violates the constraint that the proposed design must not involve cutting down any trees.
  1. Compromised Criterion & Impact (2 pts): Scoring Rubric

Compromised Criterion: Preserve the historic value of the city's buildings (also acceptable: Keep costs low, due to expensive structural truss remodeling).

Impact Explanation (Full Credit): Altering visible 1880s pitched rooflines with modern dark panels ruins architectural authenticity. Solton relies on visitors traveling to see its historic charm; damaging that look harms downtown businesses and tourism revenue.

  1. Recommended Engineering Alternative (2 pts): Model Responses

Accept either valid engineering alternative that obeys all constraints:

Solution A: White Roof Coating Paint or apply reflective white coating to existing roofs. Requires no structural changes, leaves all trees standing, costs significantly less, and preserves the roof shape.

Solution B: Targeted Flat-Roof Solar Install solar panels only on flat roofs or non-historic modern buildings where panels remain completely hidden from street level, leaving historic pitched roofs unaltered.

Common Student Misconception: Students often confuse "Keep costs low" as a constraint. Remind students that cost is an evaluative criterion to be minimized/optimized, whereas constraints are absolute "pass/fail" design boundaries.

Futura Engineering • Answer Key & Evaluation Guide Page 2 of 2

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