Northern Nevada Water Planning Commission May 1, 2019 1 4913.6 2 - PowerPoint PPT Presentation

Northern Nevada Water Planning Commission May 1, 2019 1

4913.6’ 2

3

Northern Nevada Water Planning Commission May 1, 2019 4

Northern Nevada Water Planning Commission May 1, 2019 CURRENT FEMA FLOODPLAIN I. Swan Lake BFE 4924’ and Boundary (1994 FIS) II. Silver Lake BFE 4972’ and Boundary (2009 LOMAR) Resulted in a water surface rise of approximately 3 feet. • 5

6

7

Northern Nevada Water Planning Commission May 1, 2019 CURRENT NEED: There are known problems with the current floodplain in Swan Lake – first of three houses to flood is located outside of the current floodplain. Based on recent events, restudy the current defined floodplain boundaries and base flood elevation(s) with respect to traditional or previous mapping approaches. New topographic data – LIDAR • Better modeling approach HEC-HMS • Updated precipitation data • Updated infiltration data • Allows for update calibration • Potential future projects rely on best information • Levees, barriers, elevated roadways • Provide better information to property owners – flood insurance • 8

Northern Nevada Water Planning Commission May 1, 2019 REQUEST: Recommendation for use of WRWC FY2020 funds in an amount not to exceed $100,000 for restudy and remap of East and West Lemmon Valley Hydrobasins Competitive process to select professional consultant(s) • RFP released June 2019 • Work initiated in August/September 2019 • Washoe County has identified up to $125,000 in FY20 • Will seek any additional required funding from other municipalities and • development community Data will assist in Closed Basin Mitigation Planning efforts • 9

QUESTIONS? 10

Concurrent Meeting – April 29, 2019 North Valley’s Closed Hydrobasins UPdate III. LONGER-TERM ACTIONS I. Regional Hazard Mitigation Plan Update I. Includes Closed Basin Mitigation Plan II. Maintain Wildlife Habitat at Swan Lake III. Area Partnerships for Use of Storm Water IV. Washoe County Storm Water Utility (Enterprise Fund) V. Lemmon Valley Waste Water Treatment Plant VI. Regional Effluent Management VII. Other Closed Basins within Washoe County 11

Historic lake elevations 2.5 5.5 1.5 12