Civil Works Assignment
USACE Civil Works Task Estimated Time: 30 Minutes • 25 Points
CIVIL WORKS INVESTIGATION
Exploring Dams, Navigation Locks, Flood Defense, and Community Infrastructure
Engineering Docket
Student Name:
Date:
Class Period:
1
Mission Briefing: The Dual Purpose of USACE
The U.S. Army Corps of Engineers (USACE) operates one of the world's largest public engineering enterprises. While maintaining military readiness, its primary domestic role is Civil Works: planning, building, and operating public infrastructure to protect communities from extreme water events, facilitate commercial barge commerce, and provide recreational lakes.
Flood Control Dams, levees & sea gates
Navigation Locks & dredged channels
Hydropower Clean electrical generation
Ecosystem & Parks Wetlands, fisheries & lakes
2
Analysis: Multipurpose Dams & Navigation Locks
6 Points
Unlike single-use private structures, USACE dams and lock chambers are engineered to manage competing river demands. Upstream reservoirs hold seasonal floodwaters to protect downstream towns, while lock chambers act as "water elevators" that allow 1,000-foot commercial barge tows to bypass rapid elevation drops along rivers like the Mississippi, Ohio, and Columbia.
1. Sluice Gates & Spillway: Releases controlled discharge volumes to stop riverbanks from overtopping during spring thaws.
2. Lock Chambers: Fills or drains gravity-fed water to raise/lower cargo vessels without using powered pumps.
3. Environmental By-Pass: Fish ladders and spillway chutes allow native species (such as salmon) to navigate barriers.
Prompt 1: Why are navigation locks considered vital to national supply chains as well as local economies? Explain how an unexpected lock closure would impact nearby communities.
3
Trade-Offs: Community Safety vs. Local Environment
6 Points
USACE oversees more than 12,000 miles of levees, hundreds of reservoirs supplying drinking water, and major harbor dredging projects. However, hardening a shoreline or damming a river alters natural hydrology, fish migration, and sediment distribution.
Prompt 2: A coastal riverfront town petitions USACE to build an extensive floodwall and surge-barrier system to safeguard homes and factories. Identify one major community benefit and one environmental or recreational trade-off engineers must address before construction begins.
USACE Civil Works Investigation Docket • Student Worksheet Page 1 of 2
PART II: REAL-WORLD PROJECTS & APPLIED CHALLENGE
Student Docket • Continued
4
Comparative Dossier: River Systems vs. Coastal Barriers
5 Points
Project Alpha: Columbia River Basin
USACE manages a network of major dams and locks in the Pacific Northwest (such as Bonneville Dam).
- Hydropower: Generates reliable regional zero-carbon electricity.
- Commercial Transit: Connects inland grain farmers 465 miles to sea.
- Challenge: Mitigating blockages to migratory salmon runs.
Project Beta: New Orleans HSDRRS
The Hurricane & Storm Damage Risk Reduction System is a 133-mile perimeter defense ring.
- Surge Barriers: Giant lakefront sector gates block tidal surges.
- Pumping Stations: Lifts trapped rainfall over massive perimeter walls.
- Challenge: Constant maintenance against marshland soil subsidence.
Prompt 3: Compare the primary mission of Project Alpha (river basin management) with Project Beta (coastal surge defense). How does community reliance differ between the two?
5
Engineering Challenge: Confluence Valley Civil Proposal
8 Points
The Scenario: You are the lead USACE Project Specialist assigned to Confluence Valley, a riverfront city of 140,000 residents. The valley faces spring flash flooding that threatens downtown neighborhoods, an outdated 80-year-old lock stalling freight barges, and a public request for new lakeside recreation and wetland protection.
1. PROJECT DESIGNATION & CORE INTERVENTIONS: (Name project & select 2 features: bypass spillway, upgraded lock chamber, setback levees, or wetland park)
2. FLOOD DEFENSE & ECONOMIC JUSTIFICATION: (Explain how your chosen features keep neighborhoods dry while keeping river shipping efficient)
3. ECOLOGICAL MITIGATION & COMMUNITY RECREATION PLAN: (How does your plan accommodate wildlife habitats, water quality, and public recreation like parks or fishing?)
Scoring Criteria: • Technical Accuracy (8 pts) • Trade-Off Reasoning (7 pts) • Proposal Completeness (10 pts)
Total: 25 Points
USACE Civil Works Investigation Docket • Form 104-CW Page 2 of 2
