water situation

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On 9th Sep 2022

09/09/65 1

ReserveSamnakbokPond Khlong Yai res. Nong Pla Lai res. Dok Krai res. Private Pond Prasae res. Existing Pipe Network Constructing Pipe Network Raw Water Pipe Line (EW) Existing Pipe Network Constructing Pipe Network Raw Water Pipe Line (RID) Bang Phra res. Nong Kho res. P1 P3P4 P8 P9 P12 P11 P13 P14 P5 P7 P P2 34.84 P6 P10 15.53 71.61 195.81 246.2037.12 Demand 2564 (MCM.) Supply (MCM.) Pump Station XX XX XX Ref: Royal Irrigation Department 64.88 148.86 104.08 23.90 P15 Overview of water situation in Rayong-Chonburi area on 9th Sep 2022 1 Chonburi Rayong BangPhra NongKho Dokkrai NongLaiPla KlongYai Prasae Reservoir capacity (MCM) 117.00 21.40 71.40 163.75 40.10 295.00 Current storage volume (MCM) 104.08 23.90 64.88 148.86 37.12 246.20 Percentage of reservoir capacity 89% 112% 91% 91% 93% 83% Useable storage volume (excluding Dead Storage) (MCM) 92.03 22.90 61.88 135.36 34.12 226.20 Inflow into reservoir (MCM) (On 8th Sep 2022) 1.729 3.546 1.5476.823 Water volume compared to previous week (-decrease, +increase) (MCM) +9.17 +1.35 +5.74 +5.92 +4.23 +28.44 +10.52 +15.89 Total water volume in each area 127.97 MCM (92.5%) 250.85(91.14%)MCM Ref: water situation from RID on 9 Sep 2022

09/09/65 3 Water situation of Bangphra, Nongkho Reservoir Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 Maximum 2006-2021 2004 2005 2015 2016 2017 2018 2019 2020 2021 Capacity Dead storage URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Bangphra and Nongkho Reservoirs (MCM.)ReservoirsNongkhoandBangphrainvolumeWater 0 20 40 60 80 100 120 140 160 9 Sep 2022 127.973 MCM. 92.47 % 2 Reservoirs total capacity 138.4 MCM. Minimum reservoir volume 13.05 MCM. URC - RID LRC - RID Average 2006-2021Maximum 2006-2021 2 1

09/09/65 4 Water situation of Bangphra Reservoir (by Year) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 2004 2005 2006 2011 2015 2016 2018 2019 2020 2021 Capacity Dead storage URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Bangphra Reservoir (MCM.)ReservoirBangphrainvolumeWater 0 20 40 60 80 100 120 140 9 Sep 2022 104.075 MCM. 88.95 % Reservoir Capacity MCM. Minimum reservoir volume .05 MCM. URC - RID LRC - RID Average 2006-2021 2

09/09/65 5 Water situation of Nongkho Reservoir (by Year) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 2 4 6 8 10 12 14 16 18 20 22 24 26 2004 2005 2011 2015 2016 2018 2019 2020 2021 Capacity Dead storage Normal useable volume URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Nongkho Reservoir (MCM.)ReservoirNongkhoinvolumeWater 0 5 10 15 20 25 9 Sep 2022 23.898 MCM. 111.67 % Reservoir Capacity .4 MCM. Minimum reservoir volume MCM. URC - RID LRC - RID Average 2006-2021 2 Normaluseable volume MCM.

Water situation of Nongplalai, Dokkrai and Klongyai Reservoirs Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 Maximum 2006-2021 2004 2005 2014 2015 2016 2017 2018 2019 2020 2021 Capacity Minimum volume Dead storage Increased Capacity URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Dokkrai Nongplalai and Klongyai Reservoirs (MCM.)ReservoirsKlongyaiandNongplalaiDokkraiinvolumeWater 0 50 100 150 200 250 300 350 31 31 30 30 29 29 28 27 27 26 26 9 Sep 2022 250.851 MCM. 91.14 % 3 reservoirs total capacity .25 MCM. Minimum reservoir volume MCM. URC - RID LRC - RID Average 2006-2021Maximum 2006-2021 2 Dead storage .5 MCM. Increased reservoir capacity (temporary) 318.13 MCM. 1

09/09/65 7 Water situation of Dokkrai Reservoir (by Year) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 10 20 30 40 50 60 70 80 90 100 2004 2005 2006 2011 2014 2015 2016 2017 2018 2019 2020 2021 Capacity Dead storage Increased Capacity URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Dokkrai Reservoir (MCM.)ReservoirDokkraiinvolumeWater 0 10 20 30 40 50 60 70 80 90 100 9 Sep 2022 64.88 MCM. 90.87 % Increased reservoir capacity (temporary) 79.41 MCM. Minimum reservoir volume MCM. URC - RID LRC- RID Average 2006-2021 Reservoir Capacity 71.4 MCM.

Water situation of Nongplalai Reservoir (by Year) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 20 40 60 80 100 120 140 160 180 200 220 2004 2005 2006 2011 2014 2015 2016 2017 2018 2019 2020 2021 Capacity Dead storage Increased Capacity URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Nongplalai Reservoir (MCM.)ReservoirNongplalaiinvolumeWater 0 50 100 150 200 9 Sep 2022 148.855 MCM. 90.9 % Reservoir Capacity .75 MCM. Minimum reservoir volume .5 MCM. URC - RID LRC - RID Average 2006-2021 Increased reservoir capacity (temporary) 187.62 MCM.

Water situation of Klongyai Reservoir (by Year) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 5 10 15 20 25 30 35 40 45 50 55 2006 2011 2014 2015 2016 2017 2018 2019 2020 2021 Capacity Dead storage Increased Capacity Lowest of tunnel URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Klongyai Reservoir (MCM.)ReservoirKlongyaiinvolumeWater 0 10 20 30 40 50 9 Sep 2022 37.116 MCM. 92.56 % Reservoir Capacity .1 MCM. Minimum reservoir volume .5 MCM. URC - RID LRC - RID Average 2006-2021 Increasedreservoir capacity(temporary) .465 MCM. Lowest water levelthat canbe transferredthroughtunnel to Nongplalai Reservoir .2 MCM.

Water situation of Prasae Reservoir Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 Maximum 2006-2021 2005 2006 2015 2016 2017 2019 2020 2021 Capacity Dead storage URC - RID LRC - RID Average 2006-2021 2022 Water Situation of Prasae Reservoir (MCM.)ReservoirPrasaeinvolumeWater 0 50 100 150 200 250 300 350 9 Sep 2022 246.2 MCM. 83.46 % Reservoir Capacity MCM. Minimum reservoir volume MCM. URC - RID LRC - RID Average 2006-2021Maximum 2006-2021

Measure Planned Water Volume (MCM) 2022 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Total 1. Primary measures 1.1Water diversion via pumping from Prasae Reservoir PlannedPS-KY 2.00 2.00 3.00 4.50 4.50 4.50 4.50 25.00 Planned PS-NPL 0.14 0.21 0.67 0.48 0.20 0.13 1.00 0.15 0.15 0.15 0.15 0.15 3.58 ActualPS-KY 3.05 2.10 2.60 4.63 1.93 1.02 0.00 15.33 PSActual-NPL 0.14 0.21 0.66 0.48 0.17 0.13 0.11 0.17 0.05 2.12 1.2 Divert Water from Bangpakong River + Private Pond Planned Private Pond 1.49 1.70 1.94 1.45 0.51 0.21 0.47 - - - - 0.79 8.55 Planned Bangpakong 0.08 5.78 7.74 7.57 2.43 23.60 PrivateActualPond 1.49 1.70 1.94 1.45 0.51 0.21 0.47 7.77 Actual Bangpakong 0.00 3.52 0.12 3.64 1.3 Klong Saphan reverse pumping station Planned KlongSaphan 4.00 4.00 2.00 10.00 Actual KlongSaphan 2.22 0.00 2.22 1.4 Divert Water from Klong Pra ChaiyanuchitOng Planned 10.0 14.0 7.0 8.0 10.0 39.00 Actual 1.66 10.68 12.34 Summary of water shortage prevention and mitigation measures in Rayong and Chonburi Provinces 2022 19 Aug 1620JulJul 8 Sep 8 Sep 23 Aug

Target Line and Reservoir Simulation in Chonburi • Divert water from Bang Pa Kong River and Pra Ong Chaiyanuchit (diversion will according to the water situation) • Increase water diversion from Rayong (diversion will according to the water situation) On 9th Sep 2022 Water Volume 157.33 MCM 155 130 Normal Status All Clear) Prepare water reserve Surveillance of water scarcity Water shortage warning • Divert Water from Khlong Luang Ratchalothorn reservoir (diversion will according to the water situation) • Consideration for another private pond • Reduce water usage for various activities Minimum storage volume15.05 MCM. 155 155 130 Prepare water reserve Normal Status All Clear)

09/09/65 13 Target Line and Reservoir Simulation in Rayong 230 220 170 220 On 9th Sep 2022 Water Volume 250.85 MCM or 91.14% Normal Status All Clear) Surveillance of water scarcity Water shortage warning Minimum storage volume 31.70 MCM. • Divert water from Prasae reservoir via Prasae Yai pipeline and Prasae Nong Pla Lai pipeline (diversion will according to the water situation) • Divert water from Wat La Harn Rai to Nong Pla Lai reservoir (diversion will according to the water situation) • Divert water from Prasae reservoir via Prasae Klong Yai pipeline and Prasae Nong Pla Lai pipeline (Full efficiency) • Divert water from Wat La Harn Rai to Nong Pla Lai reservoir (Full efficiency) • Reduce water consumption for all activities Normal Status All Clear) 170

Target Line and Reservoir Simulation in Prasae • Divert water from Khlong Saphan canal to Prasae reservoir (diversion will according to the water situation) • Divert water from Wang Ta Nod canal to Prasae reservoir (diversion will according to the water situation) • decrease divert water from Prasae reservoir (diversion will according to the water situation) 250 250 Storage Volume 295.0 MCM Normal Status All Clear) Prepare water reserve Surveillance of water scarcity Water shortage warning Minimum storage volume 20.0 MCM. • Reduce water consumption for all activities On 9th Sep 2022 Water Volume 246.20 MCM or 83.46% 250 160 Prepare water reserve Normal Status All Clear) 160

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