A LPINE C OUNTY , C ARSON C ITY , , D OUGLAS C OUNTY AND L YON C - - PowerPoint PPT Presentation

FLOODPLAIN ORDINANCE UPDATE FOR

OR

ALPINE COUNTY, CARSON CITY, , DOUGLAS COUNTY AND LYON COUNTY

CARSON WATER SUBCONSERVANCY DISTRICT BOARD OF DIRECTORS JULY 17, 2019

Purpose

❑ Accommodate the new regional floodplain mapping and flood insurance rate maps (FIRMs) ❑ Implement the use of the Carson River Regional Hydraulic Model ❑ Improve standards to exceed FEMA minimum requirements ❑ Implement Carson Flood Mitigation Plan mitigation measures ❑ Update and improve floodplain ordinance language ❑ Improve consistency among jurisdictions

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Primary Project Tasks

❑ Review pertinent documents, guidance, and resources ❑ Update Jurisdiction Specific Needs and Opportunities ❑ Prepare Floodplain Ordinance Language, Draft and Final ❑ Assist with Floodplain Ordinance Adoption

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Guidance, Documents & Resources

❑ Existing jurisdiction ordinances ❑ Model ordinances ❑ FEMA guidance ❑ Carson River Regional Floodplain Management Plan ❑ Carson River Flood Mitigation Plan ❑ Carson River Regional Hydraulic Model ❑ Model Management, Distribution, and Update Guide

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Update Needs and Opportunities

❑ Met with each jurisdiction’s staff

❑ Reviewed the 2016 needs and opportunities assessments ❑ Discussed and updated needs, unique circumstances, programs, and opportunities

❑ Met with CWSD staff

❑ Reviewed the 2016 needs and opportunities assessments ❑ Discussed and updated general and specific jurisdictional needs and opportunities

❑ Updated the Needs and Opportunities Summary

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Update Needs and Opportunities

❑ A General Conclusion –

❑ There is continuing support for the CWSD to lead and coordinate the regional management approach for the Carson River

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FLOODPLAIN ORDINANCE UPDATE PROJECT 7/17/2019

Alpine County

❑ Largest ordinance revision needed due to limited existing language ❑ The new West Fork of the Carson River FIRMs will have special flood hazard zones ❑ Interested in including requirements to use the Carson River Regional Hydraulic Model ❑ Possibly add/increase development standards along non- mapped waterways ❑ Possibly add provisions for dam failure inundation zones

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Douglas County

❑ Modest number of revisions desired ❑ Currently require and want to continue to require use the Carson River Regional Hydraulic Model ❑ Opportunity to improve development controls within the floodplain ❑ Possible inclusion of an erosion setback along watercourses

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Carson City

❑ Modest number of revisions desired ❑ Desire to make necessary changes to become a Class 4 CRS community ❑ Want to include requirements to use the Carson River Regional Hydraulic Model ❑ Want to change the minimum design standard for stormwater drainage to the 10-year storm ❑ Want to include better standards for erosion, landslides and mud flows

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Lyon County

❑ Moderate number of revisions desired ❑ Interested in exploring participation in the CRS program ❑ Interested in requiring use of the Carson River Regional Hydraulic Model ❑ Interested in improving the floodplain

• rdinance language and consistency

❑ Interested in increasing some standards

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Prepare Floodplain Ordinance Language

❑ Collaborative process with the jurisdictions and CWSD ❑ Prepared floodplain ordinance language for each jurisdiction ❑ Incorporated identified items for each jurisdiction, as applicable:

❑ Updated and improved language ❑ Model provisions ❑ Requirements ❑ Mitigation measures

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Common Floodplain Ordinance Language

❑ Acknowledgement of the Carson River Watershed Regional Floodplain Management Plan ❑ Recognition of the “Living River Approach” ❑ Use of the Carson River Model

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Common Floodplain Ordinance Language

❑ Restrictions on placing fill in the floodplain ❑ Restrictions on adding density in the floodplain ❑ Requirements for Compensatory storage

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Common Floodplain Ordinance Language

❑ Disclosure requirements for real estate transactions ❑ Inclusion of the X (shaded) zone ❑ Requirements for alluvial fans ❑ Improvements in CRS scoring

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Floodplain Ordinance Adoption

❑ Assist the jurisdictions with the adoption of the revised/improved floodplain ordinances

❑ Planning Commission or public outreach meeting for each jurisdiction as desired ❑ Presentation at Board of Commissioners/Board of Supervisors meetings for each jurisdiction as desired

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Status

❑ Final language completed for the jurisdictions ❑ Ordinance adoption processes started in June ❑ CWSD staff and consultant are assisting the jurisdictions during their adoption processes ❑ Each jurisdiction’s adoption process is different

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Questions?

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