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No-Rise / No-Impact Certification

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​Client: Habitat for Humanity

​Year: 2019
​​
About: 
The client requested to perform No-Rise / No-Impact evaluations for proposed new buildings on several lots that may involve encroachment into FEMA designated floodplains on Billy and Mullock Creeks located in unincorporated areas of Lee County, Florida.
​Applied Skills:
  • H&H Modeling: Data mining & processing; conceptualization & setup​​
​
Consulting Areas:
  • Stormwater management
  • Flooding assessment​​​ ​
​Specifics:
LAGO refined the corresponding FEMA HEC-RAS models available from the latest Flood Insurance Study (FIS) for Lee County. The refinement included a higher spatial resolution by inserting new cross sections around the parcels to be developed, as well as reducing model tolerances to diminish numerical errors. Then, the refined model cross sections are modified to include the proposed grading and the new buildings. 

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Software Applied:  HEC-RAS,  ArcMap
In all proposed developments, the comparison of the 100-year water surface elevations from the pre- and post-development models showed a difference of 0.00 ft at the cross-sections adjacent to the development sites, which indicated no rise of flood stages caused by the buildings. 

​Outcome:
No-Rise Certificates were issued by one of our Professional Engineers for all the proposed developments. The certificates were accompanied by support files detailing the evaluation performed.
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Modeling Services
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- Data mining & Processing
- Conceptualization & Setup
- Sensitivity Tests
- Model Calibration
- Model Telescoping
- Design Storm Simulations
- Scenario Evaluations
​- Post-Processing of results
- Peer review
- Model QA/QC
- Mass balance checks
- Fixing numerical instabilities
- Calibration/validation checks
​- Reservoir Storage Modeling
- GIS data mgmt. and tools

Consulting Areas
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- Natural resources planning
- Stormwater management
- Groundwater management
- Surface water structure design
- Water supply planning
- Species and sediment transport
- Salt water intrusion
- Floodplain delineation & management
- Floodway Encroachment Analysis
​- Urban and coastal flooding
- Water quality studies
- Wetland conservation and restoration
- Wellhead protection area delineation
- Landscape ecology
- Water regulations permitting

Featured Software
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MIKE 11
MIKE SHE
MIKE21
ECOLab
MODFLOW
GWV (Vistas)
MODHMS
​GIS-ArcMap

HEC-RAS
​HEC-HMS
EPA-SWMM
​XP-SWMM
ICPR
​RiverFlow2D
WASP
HSPF

Software Development
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Spreadsheet modeling
File format converters
Pre- & post-processing tools
A la carte software (C#, Python, etc)


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4921 S West Shore Tampa FL 33611, P.O. Box 10481, Tampa, FL 33679.  813-774-5559
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