Lake Mendocino and Lake Sonoma Water Accounting Weekly Report (Terms 12 & 13 June 2021 TUCO) Report Date: 8/27/2021 Units are cfs unless noted otherwise 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 I. Upper East Fork Reach Potter Valley Project Tunnel Diversion 30.0 30.0 30.0 30.0 30.0 30.0 30.0 PVID Requested Delivery 25.0 25.0 25.0 25.0 25.0 25.0 25.0 PVID Canals Actual Delivery 12.9 12.6 12.6 12.6 12.6 12.5 12.5 East Fork Release 17.2 17.4 17.4 17.4 17.4 17.5 17.5 PVID E Fork Diversions 12.2 12.4 12.4 12.4 12.4 12.5 12.5 PVID Water Use - PG&E Contract 25.0 25.0 25.0 25.0 25.0 25.0 25.0 PVID Water Use - License 5264 0.0 0.0 0.0 0.0 0.0 0.0 0.0 East Fork Downstream of PVID 5.0 5.0 5.0 5.0 5.0 5.0 5.0 PVID Canal Net Return Flow (assumed) 9.5 10.5 10.7 5.5 6.1 6.8 5.9 East Fork / Potter Valley Reach Analysis USGS E Fork @ Calpella 14.5 15.5 15.7 10.5 11.1 11.8 10.9 Net Reach Loss(-)/Gain(+) -15.5 -14.5 -14.3 -19.5 -18.9 -18.2 -19.1 Unimpaired Natural Flow @ Calpella (est.) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Non-PVID East Fork Net Reach Losses (est.) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Natural Flow 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Import (neg. value is return flow) 0.0 0.0 0.0 0.0 0.0 0.0 0.0

II. Lake Mendocino Resrvoir Operations Calculated Inflow (ac-ft) 43.3 29.4 37.7 32.2 21.6 46.2 7.1 (cfs) 22 15 19 16 11 23 4 Natural Flow 0 0 0 0 0 0 0 Import 22 15 19 16 11 23 4 Storage Change (ac-ft) -159.0 -175.0 -166.0 -165.0 -172.0 -131.0 -170.0 (cfs) -80 -88 -84 -83 -87 -66 -86 Stored Natural Flow (cfs) 0 0 0 0 0 0 0 Stored Import Water (cfs) 0 0 0 0 0 0 0 Evaporation (ac-ft) 12.7 12.0 13.1 14.2 13.5 14.6 14.5 RVCWD Diversion (ac-ft) (est.) 0 0 0 0 0 0 0 CVD Release Gage 96 97 96 92 91 82 82 Storage (Project Water) 74 82 77 76 80 59 78 Natural Flow 0 0 0 0 0 0 0 Import Water 22 15 19 16 11 23 4 East Fork Min Instream Flow Requirement 25 25 25 25 25 25 25 Compliance Gage Rvr mi. CVD Release 99.9 96 97 96 92 91 82 82 CVD Project Water Release to Meet Min Flow Requirement Total Pass-through Water 22 15 19 16 11 23 4 Project Water Release Required Yes Yes Yes Yes Yes Yes Yes

III. Upper Russian River Reach Minimum Instream Flow Requirement 25 25 25 25 25 25 25 Controlling Compliance Gage Min Gage Flow 37 38 39 41 41 40 38 Controlling Gage Healdsburg Healdsburg Healdsburg Healdsburg Healdsburg Healdsburg Healdsburg All Compliance Gages Rvr mi. Forks (CVD + USGS 11461000) 99.0 96 97 96 92 91 82 82 Talmage (USGS 11462080) 96.1 79 80 80 74 73 66 64 Hopland (USGS 11462500) 84.8 68 68 69 66 62 58 58 Cloverdale (USGS 11463000) 70.9 71 69 69 71 67 67 60 Geyserville (USGS 11463500) 54.4 52 54 54 53 55 51 50 Jimtown (USGS 11463682) 48.5 45 46 47 48 48 46 44 Digger Bend (USGS 11463980) 38.2 39 40 41 43 42 41 40 Healdsburg (USGS 11464000) 35.6 37 38 39 41 41 40 38 Net Reach Loss(-)/Gain(+) Forks - Talmage -16 -17 -16 -18 -18 -17 -18 Talmage - Hopland -6 -7 -6 -4 -5 -5 -6 Hopland - Cloverdale -3 -3 -4 -4 -2 -2 -1 Cloverdale - Jimtown -25 -24 -23 -21 -22 -23 -23 Jimtown - Digger Bend -5 -5 -5 -5 -6 -6 -5 Digger Bend - Healdsburg -2 -2 -2 -2 -2 -2 -2 Upper Russian Net Reach Loss/Gain -57 -58 -57 -55 -55 -54 -54 CVD Project Water Release to Meet Min Flow Requirement Net Reach Loss(-)/Gain(+) to Controlling Gage -57 -58 -57 -55 -55 -54 -54 Storage (Project Water) 57 58 57 55 55 54 54 Pass-through Water (Natural + Import) 0 0 0 0 0 0 0 Total Pass-through Water 22 15 19 16 11 23 4 Project Water Release Required Yes Yes Yes Yes Yes Yes Yes

Notes: - Water Accounting for the Upper Russian River is an analysis that approximates the current conditions based on methodology in Term 11 (2/11/21 Order) report and modified by Term 12 (6/14/21 Order) report. Values listed include estimated values where measurements are not currently available (red italics). 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 IV. Lake Sonoma Lake Sonoma Storage Change (ac-ft) -226.0 -193.0 -209.0 -193.0 -177.0 -209.0 -176.0 (cfs) -114 -97 -105 -97 -89 -105 -89 Evaporation (ac-ft) 15.4 14.2 17.5 15.3 16.4 17.4 18.5 Inflow (Natural Flow) 0 0 0 0 5 0 3 WSD Release Gage 84 84 84 84 86 86 83 Storage (Project Water) 84 84 84 84 81 86 79 Natural Flow 0 0 0 0 5 0 3 V. Lower Dry Creek Reach Minimum Instream Flow Requirement 25 25 25 25 25 25 25 Controlling Compliance Gage Min Gage Flow 73 74 75 74 73 76 73 Controlling Gage Dry Crk Mouth Dry Crk Mouth Dry Crk Mouth Dry Crk Mouth Dry Crk Mouth Dry Crk Mouth Dry Crk Mouth All Compliance Gages Crk mi. WSD Release 14.3 84 84 84 84 86 86 83 Yoakim (USGS 11465200) 11.1 86 86 86 86 87 89 85 Lambert (USGS 11465240) 6.8 93 93 93 93 93 96 91 Dry Crk Mouth (USGS 11465350) 0.1 73 74 75 74 73 76 73 WSD to Russian River Confluence Reach Analysis Total Pass-through Water 0 0 0 0 5 0 3 Net Reach Loss(-)/Gain(+) WSD - Yoakim +2 +2 +2 +2 +3 +5 +1 Yoakim - Lambert +7 +7 +8 +7 +7 +6 +6 Lambert - Dry Crk Mouth -20 -19 -19 -19 -20 -20 -19 WSD - Dry Crk Mouth -10 -10 -9 -10 -10 -8 -12 WSD Project Water Release to Meet Min Flow Requirement Net Reach Loss/Gain to Controlling Gage -10 -10 -9 -10 -5 -8 -9 Project Water Release Required Yes Yes Yes Yes Yes Yes Yes VI. Russian River - Dry Creek Confluence Upper Russian River Flow (Healdsburg Gage) L. Mendocino Project Water + Import Water 37 38 39 41 41 40 38 Natural Flow 0 0 0 0 0 0 0 Dry Creek Flow (Mouth Gage) L. Sonoma Project Water 73 74 75 74 73 76 73 Natural Flow 0 0 0 0 0 0 0 Russian River d/s of Confluence Flow 110 112 114 115 114 116 111 L. Mendocino Project Water + Import Water 37 38 39 41 41 40 38 L. Sonoma Project Water 73 74 75 74 73 76 73 Natural Flow 0 0 0 0 0 0 0 VII. Lower Russian River Reach Minimum Instream Flow Requirement 35 35 35 35 35 35 35 Controlling Compliance Gage Min Gage Flow 39 38 44 52 48 48 46 Controlling Gage Hacienda Hacienda Hacienda Hacienda Hacienda Hacienda Hacienda All Compliance Gages Rvr mi. Windsor (USGS 11465390) 26.6 102 104 104 105 105 104 102 Hacienda (USGS 11467000) 21.8 39 38 44 52 48 48 46 Confluence to Windsor Reach Analysis Net Reach Loss/Gain to Windsor Gage -8 -8 -9 -10 -9 -12 -9 L. Mendocino Project Water + Import Water 37 38 39 41 41 40 38 L. Sonoma Project Water 68 70 70 70 69 71 67 Natural Flow 0 0 0 0 0 0 0 Confluence to SCWA Wohler Production Facility Reach Analysis Approx. Flow u/s of Wohler 129 98 105 106 114 117 105 Net Reach Loss(-)/Gain(+) +19 -13 -9 -9 +0 +0 -5 L. Mendocino Project Water + Import Water 34 29 34 34 36 33 35 L. Sonoma Project Water 68 70 70 70 69 71 67 Natural Flow 27 0 0 1 9 12 3 Confluence to Hacienda (Guerneville) Reach Analysis Net Reach Loss(-)/Gain(+) -71 -73 -70 -63 -67 -68 -65 L. Mendocino Project Water + Import Water 34 29 34 34 36 33 35 L. Sonoma Project Water 0 9 9 16 2 3 8 Natural Flow 5 0 0 1 9 12 3 VIII. Water Production under Sonoma Water Water Rights (ac-ft) Lower Russian River Sonoma Water Total 178.5 119.4 121.5 108.0 132.1 136.1 117.7 Wohler 100.2 75.1 80.0 63.7 73.2 74.1 74.9 Mirabel 78.3 44.3 41.5 44.3 58.9 61.9 42.8 Town of Windsor River Wellfield 9.5 8.8 8.8 8.0 8.8 9.4 10.7 Camp Meeker & Occidental 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Upper Russian River City of Healdsburg Gauntlett & Fitch Mtn 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Dry Creek City of Healdsburg Dry Creek Wellfield 2.6 2.6 2.5 2.6 2.6 2.5 2.5

Notes: - Water Accounting for the Lower Russian River and Dry Creek is an analysis that approximates the current conditions based on the methodology in Term 12 (6/14/21 Order) report. Values listed include estimated values where measurements are not currently available (red italics). Lake Mendocino and Lake Sonoma Water Accounting Weekly Schematic

(Terms 12 & 13 June 2021 TUCO) PVP Tunnel Diversion: 30 cfs -PVP losscfs Calpella:-17.1 Report Date: 8/27/2021 All reported values are weekly averages from the Lake Mendocino and Lake Sonoma Weekly Accounting Report. Reach losses are calculated using estimated travel times, and are reported here as weekly averages.

Potter Valley Calculated Inflow: 15.7 cfs Storage Change: -162.6 ac-ft/day Evaporation: 13.5 ac-ft/day Calpella: 12.9 cfs

Lake Mendocino West Fork: 0 cfs CVD Release: 90.8 cfs (total) 75.1 cfs Storage (Project Water) 0 cfs Natural Flow 15.7 cfs Import Water Calculated Natural Inflow: 1.1 cfs Forks: 90.8 cfs Forks - Talmage: Storage Change: -197.6 ac-ft/day (Forks -River Upper Russian loss:cfs -55.5 Healdsburg) Talmage: -17.2 cfs reach loss Evaporation: 16.4 ac-ft/day 73.7 cfs Talmage - Hopland: Hopland: -5.5 cfs reach loss 64.1 cfs Lake Sonoma Hopland - Cloverdale: -2.6 cfs reach loss -10 cfs reach lossreach cfs-10 - (WSDCreek Dry Mouth): Cloverdale: WSD Release Gage: 84.3 cfs (total) 67.6 cfs 83.2 cfs Storage (Project Water) 1.1 cfs Natural Flow WSD - Yoakim: Geyserville: Cloverdale - Jimtown: 2.3 cfs reach gain 52.5 cfs -23.1 cfs reach loss Yoakim: 86.3 cfs Jimtown: 46.1 cfs Yoakim - Lambert: Jimtown - Digger Bend: -5.3 cfs reach loss 6.9 cfs reach gain Digger Bend: Lambert: 40.9 cfs 93.2 cfs Digger Bend - Healdsburg: -1.8 cfs reach loss City of Healdsburg Healdsburg: Dry Creek Wellfield Production: Lambert - Mouth: 39 cfs 2.6 ac-ft/day -19.2 cfs reach loss Healdsburg - Confluence: -8.9 cfs reach loss

Dry Crk Mouth: ofCity Healdsburg Gauntlett &Fitch Mtn Production (underSCWA water 0 right): ac-ft/day 74 cfs

Calculated Confluence Flow: 113.1 cfs (total) L. Mendocino Project Water + Import Water: 39 cfs L. Sonoma Project Water: 74 cfs Confluence - Windsor: -9.3 cfs reach loss

Town of Windsor River Wellfield Production: 9.2 ac-ft/day

Approx. Flow u/s of Wohler: 110.7 cfs (total) Windsor: L. Mendocino Project Water + Import Water: 33.6 cfs 103.7 cfs L. Sonoma Project Water: 69.4 cfs Confluence - Wohler: Natural Flow: 7.6 cfs -2.4 cfs reach loss

Sonoma Water Total Production: 130.5 ac-ft/day Wohler: 77.3 ac-ft/day Mirabel: 53.1 ac-ft/day Confluence - Hacienda: -68.2 cfs reach loss Approx. Flow d/s of Wohler: 44.9 cfs (total) L. Mendocino Project Water + Import Water: 33.6 cfs Hacienda: L. Sonoma Project Water: 6.7 cfs 44.9 cfs Natural Flow: 4.5 cfs

Camp Meeker & Occidental Production: 0.1 ac-ft/day Lake Mendocino and Lake Sonoma Water Accounting Weekly Report (Term 12 June 2021 TUCO) Report Date: 8/27/2021

UPPER RUSSIAN RIVER NET REACH GAINS (+) / LOSSES (-) 5

-5

-15

-25 cfs

-35

-45

-55 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 Forks - Talmage Talmage - Hopland Hopland - Cloverdale Cloverdale - Jimtown Jimtown - Digger Bend Digger Bend - Healdsburg

UPPER RUSSIAN RIVER STREAM FLOWS Forks Talmage Hopland Cloverdale Min Flow Required (Upper River) Geyserville 120

100

80 cfs

60

40

20

0 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 8/27/2021 Lake Mendocino and Lake Sonoma Water Accounting Weekly Report (Terms 12 & 13 June 2021 TUCO) Report Date: 8/27/2021

LOWER RUSSIAN RIVER NET REACH GAINS (+) / LOSSES (-) 0

-10

-20

-30 cfs -40

-50

-60

-70 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 Healdsburg - Windsor Windsor - Hacienda

LOWER RUSSIAN RIVER STREAM FLOWS

Windsor Hacienda Min Flow Required 120

100

80 cfs

60

40

20

0 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 8/27/2021 Lake Mendocino and Lake Sonoma Water Accounting Weekly Report (Terms 12 & 13 June 2021 TUCO) Report Date: 8/27/2021

DRY CREEK NET REACH GAINS (+) / LOSSES (-) 10

5

0

-5 cfs -10

-15

-20

-25 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 WSD - Yoakim Yoakim - Lambert Lambert - Mouth

DRY CREEK STREAM FLOWS

WSD Yoakim Lambert Min Flow Required (Dry Creek) Mouth 120

100

80 cfs

60

40

20

0 8/20/2021 8/21/2021 8/22/2021 8/23/2021 8/24/2021 8/25/2021 8/26/2021 8/27/2021