Effects of persistent drought on Lake Mead and

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Effects of persistent drought on Lake Mead and the Las Vegas Valley Shari Schwartzer

Effects of persistent drought on Lake Mead and the Las Vegas Valley Shari Schwartzer

Agenda • • • Background Drought Information Stream Delineation Bathymetry Calculations Future Work

Agenda • • • Background Drought Information Stream Delineation Bathymetry Calculations Future Work

Lake Mead • • Largest reservoir in US Formed by Hoover Dam Supplies water

Lake Mead • • Largest reservoir in US Formed by Hoover Dam Supplies water to NV, AZ, CA Currently at 37% capacity

Third Straw • $817 M • 6 years • Uncapped September 2015

Third Straw • $817 M • 6 years • Uncapped September 2015

Water Use

Water Use

Drought in Las Vegas Valley

Drought in Las Vegas Valley

Stream Delineation

Stream Delineation

Stream Delineation

Stream Delineation

Stream Delineation

Stream Delineation

Bathymetry

Bathymetry

Bathymetry – Boulder Basin

Bathymetry – Boulder Basin

Lake Mead Depth YEAR 2011 2012 2013 2014 2015 2016

Lake Mead Depth YEAR 2011 2012 2013 2014 2015 2016

Lake Mead Level Calculations Surface Area Volume Max depth Watershed Area Mean Inflow Hydraulic

Lake Mead Level Calculations Surface Area Volume Max depth Watershed Area Mean Inflow Hydraulic Residence Time Watershed Area to Lake Surface Area Ratio 2009 Given 637. 05 3583. 4 162 433, 000 13. 4 2. 6 680 Calculated Units 611. 828 m 2 2690. 0 m 3 144. 27 m 427944 km 2 km 3/yr years 699 % Dif -4% -25% -11% -1% 3%

Future Work – Compare bathymetry from different years • Utilize 3 D Analyst tools

Future Work – Compare bathymetry from different years • Utilize 3 D Analyst tools • Calculate mean, max depths, volume changes – Factors for volume changes i. e. evaporation, population growth – Calculate volume-area-elevation function

References • Clark County (US Census – Population data) – http: //www. clarkcountynv. gov/gis/services/Pages/Free.

References • Clark County (US Census – Population data) – http: //www. clarkcountynv. gov/gis/services/Pages/Free. GISData. aspx • USGS – Stream flow, water level, river reach – http: //nevada. usgs. gov/lmqw/ • Bureau of Reclamation -Lake levels form the lower Colorado river operations – http: //www. usbr. gov/lc/riverops. html • NOAA – precipitation data – http: //www. cpc. ncep. noaa. gov/products/GIS_DATA/USDM_Products/precip/index. php • North American Land Data Assimilation System (NLDAS) monitor -precipitation, runoff, evaporation, and snow melt) – http: //www. emc. ncep. noaa. gov/mmb/nldas/ • Southern Nevada Water Authority (SNWA)

Thank you QUESTIONS?

Thank you QUESTIONS?