WATER WATCH REPORT May 20, 2019

Supply Reservoir Contents

Capacity Current Usable Percent Full

(acre-feet) Contents Last Historic

Reservoir Total Usable (acre-feet) Current Year Median

Antero 19,881 19,826 19,262 97% 101% 100%

Eleven Mile 97,779 97,779 99,658 102% 102% 102%

Cheesman 79,064 79,064 61,461 78% 89% 92%

Marston 19,256 13,133 7,110 54% 70% 76%

Strontia Springs 7,863 7,163 6,304 88% 85% 94%

Chatfield 27,076 10,782 10,629 99% 98% 93%

Dillon 257,304 249,095 180,300 72% 98% 91%

Gross 41,811 29,811 7,701 26% 52% 47%

Ralston 10,776 7,276 3,987 55% 77% 79%

Meadow Creek 5,370 4,520 0 0% 62% 29%

Total 566,180 518,449 396,412 76% 93% 85%

0

100

200

300

400

Apr May Jun

Millio

ns o

f G

allo

ns

Daily Use

Actual Use (2019) 2014-2018 Avg

May 20, 2019

0

100,000

200,000

300,000

400,000

500,000

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Acre-Feet

Wet Weather Forecast

Normal Weather Forecast

Dry Weather Forecast

2019

Historic Median

Full

Supply Reservoir Contents

Note: Denver Water forecasts seasonal reservoir storage contents under dry future weather, normal future weather and wet future weather scenarios.

May 20, 2019

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Inches

May Precipitation

Average Monthly Total

Normal Month to Date

2019 Month to Date

May 20, 2019

0

5

10

15

20

25

30

35

40

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

Inc

hes o

f L

iqu

id P

recip

itati

on

Average (1981-2010)

2018-2019

Cumulative Precipitation: Colorado River Watershed

Cumulative Precipitation: South Platte River Watershed

0

5

10

15

20

25

30

35

40

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

Inc

hes o

f L

iqu

id P

recip

itati

on Average (1981-2010)

2018-2019

Data are from the 7 SNOTEL stations above Denver Water's Upper Colorado diversion facilities.

Data are from the 7 SNOTEL stations above Denver Water's Upper South Platte diversion facilities.

Today’s % of Avg: 114%

%

Today’s % of Avg: 121%

May 20, 2019

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

Oct Nov Dec Jan Feb Mar Apr May Jun

Avera

ge W

ate

r C

on

ten

t (i

nch

es)

Snowpack: South Platte River WatershedHistoric Range (1979-2018)

Median (1981-2010)

2018-2019

Data are from the 7 Snotel stations above Denver Water's Upper South Platte diversion facilities.

Today's % of Normal: 188%

Peak % of Normal Peak: 124%

0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

Oct Nov Dec Jan Feb Mar Apr May Jun

Avera

ge W

ate

r C

on

ten

t (i

nch

es)

Snowpack: Colorado River WatershedHistoric Range (1978-2018)

Median (1981-2010)

2018-2019

Data are from the 7 Snotel stations above Denver Water's Upper Colorado diversion facilities.

Today's % of Normal: 191%

Peak % of Normal Peak: 138%

May 20, 2019

*

* Runoff forecasts are updated monthly on the 1st, so these numbers do not reflect precipitation that occurs later in the month.

90%

86%

116%

80%

81%

90%

98%

92%

113%

101%

147%

91%

110%

115%

118%

118%

140%

124%

181%

109%

121%

141%

138%

145%

40% 60% 80% 100% 120% 140% 160% 180% 200%

Williams Fork Reservoir

Fraser at Winter Park

Dillon Reservoir

Gross Reservoir

Strontia Springs Reservoir

Cheesman Reservoir

Eleven Mile Reservoir

Antero Reservoir

Percent of Average (1981-2010)

May 1st April-July Water Supply Forecast Range

Legend

<----------------------------Drier----------------------------------Future Conditions---------------------------------Wetter-------------------------->

Minimum Forecast: there is a 90% chance the forecast will

exceed this volume.

Most Probable Forecast: there is a 50% chance the forecast will

exceed this volume.

Maximum Forecast: there is a 10% chance the forecast will

exceed this volume.

East

Slo

pe

Res

ervo

irs

Wes

t Sl

op

e R

eser

voir

s

May 20, 2019

0

200

400

600

Mar Apr May Jun Jul Aug

Stre

amfl

ow

(cfs

)

Average (1980-2015)

2019

Cheesman Reservoir Natural Inflow

0

400

800

1,200

1,600

Mar Apr May Jun Jul Aug

Stre

amfl

ow

(cfs

)

Dillon Reservoir Natural Inflow

Average (1980-2015)

2019

May 20, 2019

0

25

50

75

100

0

100

200

300

400

Ja

n

Feb

Mar

Apr

May

Ju

n

Ju

l

Aug

Sep

Oct

No

v

De

c

Degre

es F

ahre

nheit

Mill

ions o

f G

allo

ns

2019 Water Use and Weather Conditions

Precipitation Event - Metro Avg. Water Use*

Daily High Temperature* Long-Term Avg. Daily High Temperature*

* Rolling 5-Day Avg.

May 20, 2019

Notes: 1) "AF" denotes acre-feet. "MG" denotes million gallons. 2) Expected Daily Use is based on historical use with normal weather conditions. 3) The predicted end-of-month supply reservoir contents figures assume normal weather after May 1, 2019. 4) The differences between predicted and actual end-of-month supply reservoir contents are the result of normal estimation error of daily use, supply, evaporation, carriage losses and raw water deliveries. 5) Predicted supply reservoir contents last updated on May 8, 2019. 6) Daily water figures are subject to change.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec YTD-Avg

Predicted End-of-Month Supply Reservoir

Contents (Full = 518,449 AF)

Actual % Full 76% 76% 76% 77%

Historical Median % Full 80% 80% 79% 77%

14-'18 Avg. Daily Use (MG) 109 109 107 126 171 270 296 280 246 149 108 105 120

Actual Daily Use (MG) 1 102 111 101 114 132

2 111 105 101 96 137

3 112 106 109 105 149

4 111 114 107 109 169

5 106 108 105 108 180

6 112 106 104 111 179

7 116 110 110 121 149

8 112 103 104 118 138

9 110 107 108 110 132

D 10 111 109 105 97 136

A 11 100 111 101 102 143

Y 12 104 109 107 102 159

13 109 113 97 100 195

O 14 109 107 108 108 200

F 15 106 108 104 114 221

16 108 104 99 114 216

M 17 110 108 104 112 206

O 18 105 117 112 115 180

N 19 102 114 113 122

T 20 103 113 105 127

H 21 113 111 105 120

22 106 111 108 117

23 112 108 99 128

24 109 112 98 139

25 106 115 106 143

26 109 116 103 148

27 106 118 106 151

28 105 110 100 142

29 107 95 135

30 107 105 116

31 110 103

Monthly Average 108 110 104 118 168 118

% of '14-'18 Avg. Daily Use 99% 101% 97% 94% 98% 98%

Actual End-of-Month Supply Reservoir

Contents (AF)397,696 393,994 392,690 398,810

Denver Water Use and Reservoir Contents 2019

445,000

May 20, 2019

Lake Powell Report

Denver Water gets half of its water supply from the Colorado River and closely monitors conditions at Lake Powell and within the greater Colorado River Basin.

0

5

10

15

20

25

30

Oct

No

v

Dec Jan

Feb

Mar

Ap

r

May JunSn

ow

Wat

er E

qu

ival

ent

(in

ches

) Colorado River above Lake Powell Snowpack Historic Range

Median

2018-2019

2017-2018

Data are from the 115 SNOTEL stations above Lake Powell located in Colorado, Utah and Wyoming.

% of Normal: 163%

170%

139%

110%

0% 20% 40% 60% 80% 100% 120% 140% 160% 180%

Maximum

Most Probable

Minimum

May 1st Lake Powell Apr-Jul Natural Runoff Volume Forecast

3,400

3,500

3,600

3,700

3,800

Jan

-01

Dec

-01

Dec

-02

Dec

-03

Dec

-04

Dec

-05

Dec

-06

No

v-0

7

No

v-0

8

No

v-0

9

No

v-1

0

No

v-1

1

Oct

-12

Oct

-13

Oct

-14

Oct

-15

Oct

-16

Oct

-17

Sep

-18

Sep

-19

Sep

-20

Elev

atio

n (

ft)

Lake Powell Elevation (2001-Current) Elevation (ft)

Full Elevation(ft)

ProjectedElevation (ft)

Percent of 1981-2010 Average