Sean de Guzman, P.E. Department of Water Resources Snow Surveys

Number of Stations Reporting

Number of Interpolation Days

Percent of Interpolation Days

2 540 2%

3 7,590 32%

4 10,219 43%

5 251 1%

6 1,318 6%

7 1,544 7%

8 1,834 8%

9 445 2%

15 Total Gauges 23,741 Days Water Years: 1948 to 2013

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Gau

ges R

epor

ting

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-121 -120.5 -120 -119.5 -119

Elev

atio

n (ft

)

Latitude

HRU Centroids

Gauge_Locations

HRU Gages

Max Elevation (ft) 11,843 5,653

Mean Elevation (ft) 6,271 2,989

Min Elevation (ft) 112 210

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Prec

(in)

HRU

Merced PPT 12/23/1995

Old

New

Station Max

Station Min

Learn spatial characteristics from archive of measured precipitation/temperature

Apply with whatever gage data is available at each time step

y = 0.0002x + 0.2801 R² = 0.811

y = 0.003x + 2.2142 R² = 0.7048

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0 500 1000 1500 2000

Max

Dai

ly P

reci

pita

tion

(in)

Avg QPE at Gauge

Max QPE at Gauge

Visually see how DRAPER distributes precipitation spatially

Help calibrate DRAPER for future revisions Continue analysis on more basins