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LCDR Corinna Fleischmann, PhD, PECivil Engineering, US Coast Guard Academy
LT Elizabeth Nakagawa, MSCE, MBA, PECivil Engineering, US Coast Guard Academy
LT Chris VerlindenMarine and Environmental Science, US Coast Guard Academy
GIS as a critical tool in a Water Resources focused
Civil Engineering Capstone
Outline
The US Coast Guard Academy (CGA)
Civil Engineering Capstone at CGA
U-Lot project
2016 on-going projects
•Student body approximately 900 cadets
Nation’s Smallest Service Academy
•Bachelor’s of Science Degree•Service Ready Ensigns
Two-Pronged Mission
•4 years•Competing demands: Military, Academic, Athletic
Time Constraints
•Ability to attain professional licensure•Competent in Civil Engineering Field
Civil Engineers
CGA Civil Engineering
ABET Accredited Engineering Major
Upper level course topics:
Structural analysis
Geotechnical engineering
Construction
Water Resources
Environmental Engineering
Construction Project Management
Capstone Senior Design
Determination of Projects•Instructors work with CG field units to determine project
Project Selection•Students request projects to work on•Instructor look at all inputs and assign project teams
Project teams•Generally 4-5 Students per Team
•1-2 Advisors assigned per team
Capstone Senior Design Process
Project Process: Research•Students complete general research on project topics (i.e. research seismic requirements for a project in California)
•Students write a technical paper on topic•Each group gives presentation of research topic Project Process: Site Visit
•Students arrive onsite to see conditions and meet local POC
Collaborative Design Process•Students rely on information from the local POC, Civil Engineering Design units and advisors
Presentation•Students present design to show their work
Capstone Senior Design Process
CGA Facilities Engineering Project
Topographic and Plan View Maps of Project Location
U-Lot Project Scope ID problems with the existing drainage
system Quantify U-Lot stormwater runoff Propose a redevelopment plan to correct
the issues
Initial issues with system1. Sediment in two-pond system due to broken berm2. Decreased pond retention capability
a) Upper pond channels flow with no retention capabilityb) Lower pond overflows due to minimal retention capacity
3. Lack of maintenance causes debris to obstruct the outflow to the receiving water body
As-Built Specifications
Thames River
Upper Pond
Lower Pond
Connecting Pipes
Schematic of System Failures
Design Process
Determination of Total Flow Contributions• ArcGIS
Total Surface Runoff Area22.7 Acres
Area (Acres) Runoff Coefficient Range
Residential (4.76) 0.3-0.5
Unimproved (14.08) 0.1-0.3
Asphaltic Pavement (3.87)
0.7-0.95
Design Process
Determination of Total Flow Contributions• ArcGIS• Stream Flow
Stream Location
Average Stream Flow Rate5 Gallons in 16 seconds
Total Flow Rate Contribution
0.04 ft3/s
Stream Flow Results
Design Process
Determination of Total Flow Contributions• ArcGIS• Stream Flow
Determination of Flow Rate• Rational Method
Rational Method
Table 7.2 Source: CT DEEP Manual
Flow Calculations
Design Process
Determination of Total Flow Contributions• ArcGIS• Stream Flow
Determination of Flow Rate• Rational Method
Total Volume Capacity Comparison• Current System
Current Overflow Conditions
N
Design Process
Determination of Total Flow Contributions• ArcGIS• Stream Flow
Determination of Flow Rate• Rational Method
Proposed Design Solution
Designing for Retention Retention design for sediment deposition:
• Urban stormwater has substantial quantities of settable and floatable solids. Retention slows runoff & prevents overland flow/
erosion. Existing land features (lot size, soil type, depth to water
table) allow for the capacity as designed to retain for 1-hr.
Improved Design
Design Decision Process
Control stormwater flow rate• Perforated riser compensates for greater
intensity storms as stormwater ponding increases
• Improved retention in upper pond means less water enters lower pond
Ability to drain for future storm events
SummaryImprove existing retention pond design: Increase retention in upper pond Increase total capacity in pond system Prevents unwanted overland flow
Future Considerations Conduct stream flow measurements
during different wet & dry seasons Install gabion walls to prevent further
degradation of the berm Observe/analyze future storm events to
understand & confirm the stormwater flow patterns & functionality of pond system
Map U-lot with more detailed GIS Investigate and map details of existing
pipe infrastructure
2016 Civil Engineering Capstone Projects
Increased use of GIS
Agricultural Water Collection System in Matagalpa, Nicaragua
Design & implement a pump to distribute water from the local river to a water collection tank.
◦ Native Matagalpa materials
◦ ID alternative water distribution methods from the tank to the crops
◦ Simple design solutions ensure local farmers can
maintain the systems
USCG BASE PORTSMOUTH, VA STORMWATER RE-DESIGN
PROBLEM STATEMENT The base storm sewer system has failed in various locations, mostly at storm sewer structures that allow ground and surface water infiltration into the base structures. The result is sinkholes and sediment discharges. The situation presents opportunities for ponding following heavy rains, tripping hazards and vehicle damage. Emergency repairs to the sinkholes in roadways and parking lots have been made each year but the condition is worsening.
References “Hydrologic Sizing Criteria for Stormwater Treatment Practices" (2004). Connecticut Stormwater
Quality Manual. Department of Energy and Environmental Protection. <http://www.ct.gov/deep/cwp/view.asp?a=2721&q=325704&depNav_GID=1654> (10 Feb 2015).
Schiess, Peter (2010). “Surface Hydrologic Modeling and Watershed Delineation.” ESRM 250 Introduction to Geographic Information Systems. University of Washington. Web. <http://courses.washington.edu/gis250/lessons/hydrology/> (10 Feb 2015).
Urban Runoff Quality Management (1998). Water Environment Federation and the American Society of Civil Engineers, Alexandria, Virginia.
"Web Soil Survey" (2014). United States Department of Agriculture, Natural Resources Conservation Service. <http://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm> (04 Apr 2015).
What is a Watershed?An area of land where surface water flow
drains into the same location.
Hydraulic Conductivity
22.7 μm/s
Web Soil Survey Results
Concrete Riser
