FEMA and Stream Restoration

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Presentation transcript:

FEMA and Stream Restoration Hatchet Grove Tributary Conditional Letter of Map Revision & Letter of Map Revision Process

Project Overview Two Projects – Private and Public Prestonwood Country Club Golf course redesign and stream restoration Town of Morrisville Construction of Morrisville Park and stream restoration One Stream – FEMA regulated Hatchet Grove Tributary – Zone AE w/ FW Tributary to Crabtree Creek in Wake County, NC

Project Overview Prestonwood Country Club

Project Overview Prestonwood Country Club Background Maintenance & Drainage Issue Alternative Analysis for drainage problems Functionality and appearance of stream was undesirable for golf course design Withers & Ravenel partnered and completed the engineering design Redesign & Restoration Relocated 3,500 LF of stream Five of the six existing golf cart bridges were replaced by two bridges Stream Restoration funded by EEP

Project Overview Morrisville Community Park

Project Overview Morrisville Community Park Provided engineering design services for the Town of Morrisville’s proposed park Ball fields Tennis Courts Play Ground & Picnic Area Greenway Trail – TWO BRIDGE CROSSINGS! Introduction of Stream Restoration Funding –vs- Mitigation Credit Town used the site as dedicated mitigation for EEP Other Benefits Aesthetics Maintenance Safety

Project Overview Hatchet Grove Tributary Crabtree Creek Prestonwood Golf Course Morrisville Community Park Hatchet Grove Tributary Crabtree Creek

Project Overview

Procedure Hatchet Grove Tributary: Stream Restoration Designed new stream cross section to contain the 2-year design storm at bank-full and targeted to contain the 100-year design storm within the floodplain bench

Project Overview Hatchet Grove Tributary: Stream Restoration Channel and profile design was completed – sized two bridges on golf course and two bridges on greenway

Results 100-year water surface elevations for the proposed conditions were lowered for the majority of the stream Increases under 1’ occurred at six out of the 55 cross sections Conditional Letter of Map Revision approved May 2003

Project Overview

Project Overview

Letter of Map Revision (LOMR) Hatchet Grove Tributary: As-Built Obtained As-Built survey of stream restoration and bridges Incorporated survey data into approved CLOMR model Realigned cross sections as needed for final stream alignment Updated new bridge locations on golf course

Letter of Map Revision (LOMR) Hatchet Grove Tributary: As-Built

Letter of Map Revision (LOMR) Hatchet Grove Tributary: As-Built FEMA Study The As-Built model was finalized and the FEMA submittal for the LOMR was prepared.

RESULTS Hatchet Grove Tributary: As-Built FEMA Study 100-year water surface elevations for the LOMR are 0.39 ft lower on average than the Effective model and 0.11 ft lower than the CLOMR model Increases under 1’ occurred at eight of the cross sections Letter of Map Revision submitted April 2005