Sea Aire Stormwater Austin Balser, Daniel Chewning, Kelly Creswell, Tyler DuBose
Aug 07, 2015
IntroductionOverview
ProblemGoalsConstraints
Literature ReviewGoverning EquationsConcept Review
Sustainability Timeline References
ProblemRecognition:
Urban and suburban development leads to high runoff rates and low infiltration rates which reduce the quality of ground and surface water
Definition: High volume of runoffIncreased pollutant load
GoalDesign a stormwater management plan for
Sea Aire subdivision that:Meets state regulations by ensuring the peak
flow during a 2 and 25 year storm event doesn’t exceed pre-development levels
Ensures the post-development runoff volume doesn’t exceed pre-development levels
Constraints Ecological: Must work with existing soil,
water table, vegetation, and waterwaysUltimate use: Residential living and
recreational spaceSkills: Limited knowledge and experience with
stormwater design Cost: Budget of $1200 for design process.
Must account for travel expenses, software, and testing services
Additional: Difficulty working with regulators and contractors
Questions of User, Client and DesignerUser – Residents of Sea Aire
What is a rain garden, why are there plants in the ditch?
What do I have to do?Client – New Leaf Builders through Robinson
Design EngineersWill this meet regulations?Will it cost more?
Designer – The design team and RDEWill this be long lived?Can this be an amenity?
Governing EquationsEnergy Balance
General Form Mass Balance
Curve Number Method,
Horton’s Equation
Universal Soil Loss EquationT=RKLSCP
Stormwater ManagementConventional Methods versus LID
methodsConventional methods provide solutions at the
bottom of the site (ponds, basins, ect.)Low impact development methods encourage
infiltration from all locations on site in an effort to mimic the more natural process
Comparison of Volume
1 – Pre-development 2 – Conventional Methods3 – LID Methods
LID methods maintain pre-development runoff volume while conventional methods lead to increased volume
Low Impact Develop MethodsGreen roofsRain water collectionConstructed WetlandsBioretention cellsRain gardensVegetated extended detention basins
Constructed WetlandsPublic area of development
will need a way to catch and retain stormwater
Help filter and remove containments, “Nature’s Kidney”
Shallow depression in the ground with a level bottom
SustainabilityEcological – goal of zero impact on the
runoff volume coming from the site as a means of maintaining the existing ecosystem
Social – ultimately serves the people living in the development. Promotes an active lifestyle and provides an educational opportunity.
Economic – prevents future flooding and erosion
Ethical– aim to balance the wishes of the clients and the biological integrity of the site
SustainabilityEfficiency
Capture 100% of stormwater runoff on site for design storm
Carbon and Water footprintCarbon negative
Gravity fed systems Plants will sequester carbon
Potential for decreased freshwater demands due to rainwater recycling (rain barrels)
TimelineEvent 9/8 9/10 9/17 9/24 10/1 10/7 10/8 10/15 10/22 10/29 11/5 11/12 11/19 11/26 12/3
Finish ProposalPresent Proposal
Finish majority of Literature ReviewPick Design
Start Writing Midterm Paper3- week progress report
Develop preliminary DesignCalculations for Design
Finish Writing Midterm paperMidterm Presentation and paper due
Cost Analysis for DesignBring together final design
Write Final PaperFinal Presentation
Referenceshttp://landstudy.org/Resources.htmlFangmeier, D.D., Elliot, W.J., Huffman, R.L.,
Workman, S.R. 2013. Wetlands. Soil and Water Conservation Engineering. Seventh Edition. 287-302.
Best Management Practices Handbook. South Carolina Department of Health and Environmental Control. www.scdhec.gov/Environment/waterquality/stormwater/BMPHandbook/