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

F LOODPLAIN O RDINANCE U PDATE F OR OR A LPINE C OUNTY , C ARSON C ITY , , D OUGLAS C OUNTY AND L YON C OUNTY C ARSON W ATER S UBCONSERVANCY D ISTRICT B OARD OF D IRECTORS J ULY 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 2 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 3 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 4 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 5 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 6 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 7 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 8 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 9 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 ordinance language and consistency ❑ Interested in increasing some standards 10 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 11 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 12 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

Common Floodplain Ordinance Language ❑ Restrictions on placing fill in the floodplain ❑ Restrictions on adding density in the floodplain ❑ Requirements for Compensatory storage 13 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

Common Floodplain Ordinance Language ❑ Disclosure requirements for real estate transactions ❑ Inclusion of the X (shaded) zone ❑ Requirements for alluvial fans ❑ Improvements in CRS scoring 14 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 15 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

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 16 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT

Questions? 17 7/17/2019 FLOODPLAIN ORDINANCE UPDATE PROJECT