weekly report for water watch during rainy season in 2020...

1 Water Watch and Monitoring System for Warning Branch, RID

123ว

Water Watch and Monitoring System for Warning Branch, Royal Irrigation Department , MOACTel: 0 2669 2560 Fax 0 2243 6956, 0 2241 3350, 0 2243 1098 Hotline:1460

http://www.rid.go.th/2009, http://wmsc.rid.go.th, E-mail: [email protected]

Weekly report for water watch during rainy season in 2020

During 28 September – 4 October 2020

1. Weather atmosphere for last 7 days (21 – 27 September 2020) The monsoon trough lay across the Lower North, the Upper Central and the Lower Northeast

in the first half of the week while it lay across a low pressure cell in the Gulf of Tonkin in the early of the week. The monsoon trough then moved upward across the Upper North and the Upper Northeast into the low pressure cell in the central of the South China Sea. In addition to the southwest monsoon prevailed over the Andaman Sea and the South throughout the week and it was stronger on the last day of the week so that it caused heavy rain in Upper Thailand in the first half and last day of the week. The southern part had rain almost all week and there was a report of sudden flood in some areas.

Weather map during 28 September – 3 October 2020

28 September 2020 29 September 2020 30 September 2020

1 October 2020 2 October 2020 3 October 2020

Current Situation: Monitoring, Office Hours: 07.30 – 20.30 hours


Upper wind map on level of 925 hPa during 28 September – 3 October 2020 28 Sept. 20 29 Sept. 20 30 Sept. 20 1 Oct. 20 2 Oct. 20 3 Oct. 20

Satellite images during 28 September – 3 October 2020

28 September 2020 29 September 2020 30 September 2020

1 October 2020 2 October 2020 3 October 2020


Weather atmosphere on 4 October 2020 weather map(07.00 hr.)

on 27 Sept. 2020

Upper wind map (07.00hr.) on level of 925 hPa

Satellite image

The weather forecast in twenty-four hours ahead; the monsoon trough moves across the central, and eastern parts while the southwest monsoon over the Andaman Sea, Thailand and the Gulf of Thailand is moderate. It caused Thailand to have some continuous and isolated heavy rain in the central part, Bangkok and its vicinity including the eastern and southern parts. People in the risky area should beware of the heavy and accumulated rain. The wind waves in the Andaman Sea and the Gulf of Thailand are moderate while the waves are about 2-meter high in the Upper Andaman Sea, 1-2 meter high in the Upper Gulf of Thailand, and over 2-meter high in the thunderstorm area. Ships should be navigated with caution and avoided thunderstorm areas. 2. Weather forecast for the next 7 days during 3 – 9 October 2020


Weather: the monsoon trough lies across the Lower North, the Central, the East and the Lower Northeast throughout the period. During the 5 - 7 October 2020, the high pressure area will cover Upper Thailand. In addition to the moderate southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf of Thailand so that it causes some increasing and isolated heavy rain in Thailand. The wind waves in the Andaman Sea and the Gulf of Thailand are moderate. Waves are about 2-meter high in the Andaman Sea, 1-2 meter high in the Gulf of Thailand and over 2 meter-high in the thunderstorm areas.

Warning: during 3 - 9 October 2020, people in the risky areas of Thailand should beware of the danger from heavy rain that may cause some sudden and flash floods. Ships should be navigated with caution in the Andaman Sea and the Gulf of Thailand and avoided thunderstorm areas. 3. Rainfall Condition in Summary

Daily maximum rainfall in each region (at 07.00 a.m.) from 28 Sept. – 4 Oct. 2020 On 28 September 2020 northern part at Mueang District, Roi Et Province 110.1 mm. On 29 September 2020 southern part(west coast) at Mueang District, Ranong Province 108.0 mm. On 30 September 2020 northeastern part at Lom Kao District, Phetchabun Province 77.1 mm. On 1 October 2020 southern part(east coast) at Kanchanadit District, Surat Thani Province 70.0 mm. On 2 October 2020 northeastern part at Mueang District, Khon Kan Province 57.3 mm. On 3 October 2020 eastern part at Bang lamung District, Chon Buri Province 91.2 mm. On 4 October 2020 southern part (west coast) at Takua Pa District, Phangnga Province 64.0 mm.

Rainfall volume on 3 Oct. 2020 Accumulated

rainfall volume Accumulated

rainfall volumeAccumulated rainfall volume

comparing to normal value

Year 2020 Year 2019 On 1-3 Oct. 20 On 1 Jan. – 2 Oct. 20 On 1 Jan. – 3 Oct. 20

Photograph

Error

Remark: source from Thai Meteorological Department: Immeasurable, light, moderate, heavy, and very heavy rainfall means its volume appears less than 0.1, 0.1-10.0, 10.1-35.0, 35.1-90.0 and more than 90.1 mm., respectively.

3-day rainfall forecast On 5 – 6 Oct. 20 On 6 – 7 Oct. 20 On 7 – 8 Oct. 20

07.00 hrs.-07.00 hrs. 07.00 hrs.-07.00 hrs. 07.00 hrs.-07.00 hrs.


4. Water condition in reservoir Water condition in large and medium scale reservoirs (4 Oct. 2 0 20): water volume in reservoir appears 41,1 3 6 MCM which is equal to 54% (while usable water volume appears 17,209 MCM which is equal 33%). It seems 9,677 MCM less than year 2019; however, more water capacity gets 34,932 MCM. Water condition in large scale reservoirs (4 Oct. 2020): water volume in reservoir appears 38,048 MCM which is equal to 54% while usable water volume appears 14,505 MCM which is equal to 31% and 9,514 MCM less than year 2019. Water discharge flows into reservoir with 244.93 MCM. On this week, (28 Sept. – 4 Oct. 2020) water accumulated discharge flows into the reservoirs with 1,523.58 MCM which appears 596.84 MCM less than last week (831.16 MCM more than year 2019). Water drainage volume appears 42.29 MCM. On this week (28 Sept. – 4 Oct. 2020), accumulated water volume is drained with 311.97 MCM which appears 25.49 MCM less than last week (339.63 MCM less than year 2019), and more water intake capacity remains 32,879 MCM.

Water condition in large and medium scale reservoirs on 4 October 2020

Regions

Large Scale Medium Scale Total

More Water Intake (MCM)

quantity (numbers)

Cap. at Retention Level

Water volume

quantity(numbers)

Cap. at Retention

Level

Water volume

quantity(numbers)

Cap. at Retention

Level

Water volume

In the reservoirs

Retention level (%)

Usable Water

Usable Water (%)

In the reservoirs

Retentionlevel (%)

UsableWater

UsableWater (%)

In the reservoir

Retention level (%)

Usablewater

Usablewater (%)

N

NE C W E S

Total Remark: The capacity of medium-scale reservoir has been changed since 1 November 2017 and 30 June 2018 (Unit: MCM)

Water volume in large and medium scale reservoirs in each region appears as follow:

8 24,825 11,574 47 4,829 27 75 1,001 531 53 432 48 83 25,825 12,105 47 5,261 28 13,72012 8,368 4,057 48 2,406 36 218 1,999 1,271 64 1,123 61 230 10,367 5,328 51 3,529 41 5,0403 1,419 552 39 492 36 22 369 243 66 219 64 25 1,788 795 44 711 42 9932 26,605 16,495 62 3,218 24 7 140 54 38 45 34 9 26,745 16,549 62 3,263 24 10,1966 1,515 868 57 768 54 51 964 667 69 615 67 57 2,479 1,535 62 1,383 59 9444 8,194 4,502 55 2,792 43 39 668 322 48 270 44 43 8,863 4,824 54 3,062 43 4,03835 70,926 38,048 54 14,505 31 412 5,141 3,088 60 2,704 57 447 76,068 41,136 54 17,209 33 34,932


Northern part: total water volume in reservoir appears 12,105 MCM (47% of reservoir capacity) which is 655 MCM (equal to 5%) less than year 2019. However, usable water volume appears 5,261 MCM and water volume in the reservoirs increases from last week with 382 MCM.

Northeastern part: total water volume in reservoir appears 5,328 MCM (51% of reservoir capacity) which is 1,283 MCM (equal to 19%) less than year 2019. However, usable water volume appears 3,529 MCM and water volume in the reservoirs increases from last week with 387 MCM.

Central part: total water volume in reservoir appears 795 MCM (44% of reservoir capacity) which is 36 MCM (equal to 5%) more than year 2019. However, usable water volume appears 711 MCM and water volume in the reservoirs increases from last week with 158 MCM.

Western part: total water volume in reservoir appears 16,549 MCM (62% of reservoir capacity) which is 6,836 MCM (equal to 29%) less than year 2019. However, usable water volume appears 3,263 MCM and water volume in the reservoirs increases from last week with 280 MCM.

Eastern part: total water volume in reservoir appears 1,535 MCM (62% of reservoir capacity) which is 59 MCM (equal to 4%) more than year 2019. However, usable water volume appears 1,383 MCM and water volume in the reservoirs increases from last week with 128 MCM.

Southern part: total water volume in reservoir appears 4,824 MCM (54% of reservoir capacity) which is 999 MCM (equal to 17%) less than year 2019. However, usable water volume appears 3,062 MCM and water volume in the reservoirs increases from last week with 40 MCM. Reservoirs in Bhumibol, Sirikit, Khwae Noi Bamrungdan, and Pa Sak Jolasid Dams on 28 September – 4 October 2020

Reservoirs

Water volume in the reservoirs On 4 Oct. 20

Water volume in the reservoirs

usable water volume Water volume flowing into the reservoir

Water drainage volume water volume

Water Volume

Reservoir Capacity %

(+) increase/ (-) decrease

Water volume

Usable water % On 28 Sep.- 4 Oct. 20

On 4 Oct. 20 On 28 Sep.- 4 Oct. 20

On 4 Oct. 20 More water intake

Bhumibol

Sirikit Bhumibol+

Sirikit Khwae Noi

Pa Sak Jolasid Total

(Unit: MCM) Bhumibol Reservoir: water volume appears 5,093 MCM (3 8 %) which is less than year 2019

(5 ,8 7 2 MCM: 4 3 %) with 7 3 4 MCM. However, usable water volume appears 1,2 9 3 MCM. Water discharge flowed into the reservoir today (4 Oct. 20) with 24.90 MCM while accumulated water discharge flowed into the reservoir weekly (28 Sep.-4 Oct. 20) with 201.38 MCM (103.03 MCM more than year 2019). Water volume was drained today (4 Oct. 20) 1.50 MCM while accumulated water


volume was weekly drained (28 Sep.-4 Oct. 20) with 18.00 MCM (32 .69 MCM less than year 2019). More water intake turns 8,369 MCM.

Sirikit Reservoir: water volume appears 5,679 MCM (60%) which is more than year 2019 (5,443 MCM: 57%) with 236 MCM. However, usable water volume appears 2,829 MCM. Water discharge flowed into the reservoir today (4 Oct. 20) with 22.82 MCM while accumulated water discharge flowed into the reservoir weekly (28 Sep.-4 Oct. 20) with 181.00 MCM (108.22 MCM more than year 2019). Water volume was drained today (4 Oct. 20) with 6.05 MCM while accumulated water volume was weekly drained (28 Sep.-4 Oct. 20) with 42.12 MCM (42.07 MCM less than year 2019). More water intake turns 3,831 MCM.

Khwae Noi Bamrungdan Reservoir: water volume appears 364 MCM (39%) which is less than year 2019 (502 MCM: 53%) with 184 MCM. However, usable water volume appears 321 MCM. Water discharge flowed into the reservoir today (4 Oct. 20) with 10.32 MCM while accumulated water discharge flowed into the reservoir weekly (28 Sep.-4 Oct. 20) 42.47 MCM (32.84 MCM more than year 2019). Water volume was drained today (4 Oct. 20) 0.00 MCM while accumulated water volume was weekly drained (28 Sep.-4 Oct. 20) with 5.47 MCM (12.66 MCM less than year 2019). More water intake turns 575 MCM. Pa Sak Jolasid Reservoir: water volume appears 406 MCM (42%) which is less than year 2019 (4 2 9 MCM: 4 5%) with 23 MCM. However, usable water volume appears 403 MCM. Water discharge flowed into the reservoir today (4 Oct. 20) with 12.54 MCM while accumulated water discharge flowed into the reservoir weekly (28 Sep.-4 Oct. 20) with 94.87 MCM (81.25 more than year 2019). Water volume was drained today (4 Oct. 20) with 0.00 MCM while accumulated water volume was weekly drained (28 Sep.-4 Oct. 20) 0.44 MCM (17.12 MCM less than year 2019). More water intake turns 554 MCM. Four large-scale reservoirs that have storage water criteria less than or equal to 30% of retention capacity are as follow:

No. Reservoirs


usable water volume Water volume flowing Water drainage Water volume

On 4 Oct. 2020 on 4 Oct. 2020 into the reservoirs volume

Water Volume


Water Volume


Usable water %

Today Yesterday Today Yesterday More water intake

1 Lam Sae 62 23 55 20 21 1.22 1.55 0.03 0.03 2132 Lam Nangrong 32 27 29 24 25 1.24 0.51 0.00 0.00 893 Kraseaw 89 30 49 17 19 4.77 4.37 0.02 0.02 210 4 Khlong Si Yat 92 22 62 15 16 0.73 2.48 0.02 0.20 328

Remarks: usable water in percentage = usable water volume on the report day x 100 (Unit: MCM)

Usable water volume on the reservoir


Three large-scale reservoirs that has storage water criteria more than or equal to 80% of retention capacity are as follow:

No. Reservoir


usable water volume Water volume flowing Water drainage Water volume

On 4 oct. 2020 on 4 Oct. 2020 into the reservoirs volume

Water Volume


Water Volume


Usable water %

Today Yesterday Today Yesterday More water intake

1 Chulabhorn 132 81 95 58 75 33.95 17.27 0.30 0.29 321 Khun Dan Prakan Chol 217 97 213 95 97 0.73 2.48 0.02 0.20 72 Nong Pla Lai 158 97 145 89 97 0.93 0.27 0.00 0.00 5

Remarks: usable water in percentage = usable water volume on the report day x 100 (Unit: MCM)

Usable water volume on the reservoir 5. Runoff Condition (06.00 a.m.)

River Stations Station location

Bank Capacity

Water level

Today 4 Oct. 20

Water volume Lower (-) higher (+) than the bank Criteria Trend

Today 4 Oct. 20

Yesterday 28 Sep.-4 Oct. 20

(m.) (m3 /sec)

(m.) (m3 /sec) (m3 /sec) (m.)

1. Ping Ping Ping 2. Wang 3. Yom Yom 4. Nan Nan Nan 5. Mun Mun Mun 6. Phra Sathueng 7. Bang Pakong 8. Tha Taphao 9. Tapi 10. Golok

P.1 P.7A P.17 W.4A Y.1C Y.16 N.1 N.5A N.67 M.6A M.9 M.7 Kgt.10 Kgt.3 x.158 X.37A X.119A

Nawarat Bridge Ban Huai Yang Bridge Ban Tha Ngio Ban Wang Man Ban Nam Khong Bridge Ban Bang Rakam Forestry office Ekathotsarot Bridge Ban Koei Chai Bridge Ban Satuek Ban Nong Ya Phlong Seri Pracha Thippatai Bridge Ban Sa Khwan Ban Kabin Buri Wang Khrok Bridge Ban Yan Din Daeng Ban Pa Se Mat

Mueang Mueang Banphot Phisai Sam Ngao Mueang Bang Rakam Mueang Mueang Chum SaengSatuek Mueang Mueang Mueang Kabin Buri Tha Sae Phrasaeng Su-ngai Kolok

Chiang Mai Kamphaeng Phet Nakhon Sawan Tak Phrae Phitsanulok Nan Phitsanulok Nakhon Sawan Buri Ram Si Sa Ket Ubon Ratchathani Sa Kaeo Prachin Buri Chumphon Surat Thani Narathiwatiwat

Less

Less Less Normal

Less Normal

Less Less Normal

Normal

N/A Normal

Less Normal

Less Normal

Normal

IncreasedIncreasedIncreasedIncreasedDecreasedDecreased

IncreasedIncreasedIncreasedDecreasedN/A Increased

Decreased

Increased

Decreased

IncreasedIncreased

Remark: - means no reports

Chao Phraya River Basin C.2 Station (4 Oct. 20); water volume flowed with 909 m3/sec at level of +19.87 m MSL which was 6.33 m. below the bank. Last week (28 Sep.-4 Oct. 20) water volume flowed with 645-929 m3/sec.

Chao Phraya Dam C.1 3 Station (4 Oct. 20); water volume flowed with 550 m3/sec. At upstream water level is +16.50 m MSL and at downstream water is at level of +8.98 m MSL. During the week (27 Sep.-4 Oct. 20), water volume flowed with 193-550 m3/sec. Water intake into distribution system in eastern ward field (4 Oct. 20); water was supplied with 151 m3/sec into the canals, including Khlong Chai Nat – Pa Sak (Manorom Floodgate) with 121 m3/sec, and Chai Nat – Ayutthaya (Maharat Floodgate) with 27 m3/sec, and another small canal with 3 m3/sec. During the 28 Sep.-4 Oct. 20, water volume flowed with 151-199 m3/sec. Pa Sak River (4 Oct. 20); water flowed with 108 m3/sec for Rama IV Barrage. During the week (28 Sep.-4 Oct. 20), water volume flowed with 21-108 m3/sec. And water was supplied 91 m3/sec to Rabhibhat Canal passing westward tributaries of Rabhibhat Canal (Phra Si Sin) with 24 m3/sec. and the


southward tilburies of Rabhibhat Canal (Phra Si Saowaphak Canal) with 2 9 m3/sec. During the week (28 Sep.-4 Oct. 20), water volume flowed with 84-101 m3/sec. Water intake into distribution system in western ward field (4 Oct. 20); water was supplied with 248 m3/sec to the canals, Makham Thao - Uthong Canal (Makham Thao – Uthong with 35 m3/sec, Suphan River (Phonlathep Floodgate) with 100 m3/sec, and Noi River (Borommathat Floodgate) with 80 m3/sec and another small canals with 33 m3/sec. During the week (28 Sep.-4 oct. 20), water volume flowed with 248-313 m3/sec. Bang Sai District C.29A Station (4 Oct. 20); average water volume flowed around 184 m3/sec. During the week (28 Sep.-4 Oct. 20), water volume flowed with 100-184 m3/sec. 6. Result of wet season cultivation in large and medium scale irrigation projects throughout the country and in the Chao Phraya River Basin

As on 30 September 2020

Regions In - season rice Field crop - vegetable Total

Plan (m.ha)

Result (m.ha)

% Loss Harvest (m. ha)

Plan (m.ha)

Result (m.ha)

% Harvest (m. ha)

Plan (m. ha)

Result (m. ha)

% Loss Harvest(m. ha)

North 2.37 2.16 91.29 0.154 0.05 0.026 55.67 0.0001 2.41 2.19 90.62 0.1536

Northeast 3.48 3.41 97.99 0.008 0.03 0.015 45.96 3.52 3.43 97.51 0.0077

Central 0.01 0.01 83.98 0.011 0.01 0.010 69.16 0.03 0.02 76.68 0.0109

East 0.92 0.80 86.88 0.001 0.158 0.02 0.020 79.20 0.0003 0.95 0.82 86.68 0.001 0.1580

West 1.26 1.16 92.00 0.097 0.27 0.204 76.59 0.0220 1.53 1.37 89.32 0.1187

South 0.64 0.15 22.88 0.012 0.03 0.005 19.43 0.0020 0.66 0.15 22.75 0.0136

Chao RB 8.10 6.06 74.86 2.011 0.13 0.051 40.11 0.0164 8.23 6.11 74.32 2.0269

Thailand 16.79 13.76 81.96 0.001 2.449 0.54 0.331 61.48 0.0407 17.33 14.09 81.32 0.001 2.4893

Remark: 1. North, Central, East, and West excluding area in the Chao Phraya River Basin that use water from Bhumibol, Sirikit, Khwae Noi Bamrungdan, Pa Sak Jolasid Reservoirs

2.Measurement: 6.5 rai = 1 Ha

7. Water Quality

Irrigation Department has water monitoring (Salinity value) in the Chao Phraya River. Rivers Monitoring

Point Salinity (g. /litre)

Criteria Remarks

Chao

Phraya

Canal mouth of Samlae, Pathum Thani Province

0.16Info. On 4 Oct. 2020 (07.00 hr.)

Normal - Salinity value for agriculture water is not more than 2g./litre

- Salinity value for water work is not more than 0.25 g./litre

Chao

Phraya

Pier at Nonthaburi Province

0.17 Info. On 4 Oct. 2020 (07.00 hr.)

Normal

Chao

Pier at RID Samsen,

0.18Info. On 4 Normal


Source of information: Sediment and Water Quality Branch, Hydrology Division, Bureau of Water Management and Hydrology

8. Mekong Water Situation

Stations Bank Level Water Level

26 Sep. 2020

+ higher than the bank

- Lower than the bank

Chiang Saen District, Chiang Rai Province 12.80 3.10 -9.70Chiang Khan District, Loei Province 16.00 7.96 -8.04Mueang District, Nong Khai Province 12.20 5.80 -6.40Mueang District, Nakhon Phanom Province 12.00 5.87 -6.13Mueang, Mukdahan Province 12.50 5.59 -6.91Khong Chiam District, Ubon Ratchathani Province

14.50 6.60 -7.90

Remarks: Information from www.dwr.go.th

9. Readiness Preparation and help offer

2,138 mobile pumps are prepared by RID in order to help area for in and off-season rice, consumption, field crops, and flood disaster in drought season, 2 0 19/20. Now, 529 mobile pumps are locally installed in each purpose as follows

9.1 In-season rice and field crop

Regions Province Water pumps

(quantity )

Province Name List

North 11

64 Lampang (11), Nan (9), Chiang Rai (1), Kamphaeng Phet (7), Tak (14), Sukhothai (4), Phitsanulok (3), Uttaradit (4), Phitchit (6), Mae Hong Son (1), Phrae (4)

Northeast 10

28 Sakon Nakhon (1), Loei (2), Ubon Ratchathani (3), Nong Khai

Phraya Bangkok Metropolis

Oct. 2020 (07.00 hr.)


(2), Nakhon Ratchasima (6), Buri Ram (2) Surin (1), Si Sa Ket (1), Bueng Kan (4), Udon Thani (6)

Central , East, West

1

11 Nakhon Sawan (11)

Total 22 103

9.2 Off-season rice

Regions ProvinceWater pumps

(quantity ) Province Name List

North 1 2 Phayao (2)Central ,

East, West 6 33

Nakhon Nayok (9), Chachoengsao (8), Rayong (7), Kanchanaburi (5), Chon Buri (2), Trat (2)

Total 7 35

9.3 Consumption

Regions ProvinceWater pumps

(quantity ) Province Name List

North 6 21 Nan (1), Uttaradit (2), Phichit (1), Lampang (1), Phitsanulok (9),

Sukhothai (7)

Northeast 13

204 Nakhon Ratchasima (11), Buri Ram (30), Surin (8), Si Sa Ket (2), Kalasin (4), Udon Thani (10), Sakon Nakhon (5), Bueng Kan (6), Khon Kaen (11), Roi Et (37), Ubon Ratchathani (45), Yasothon (10), Nakhon Phanom (25)

Central , East, West

11 92

Rayong (12), Chanthabuti (2), Chon Buri (2), Prachin Buri (1), Chai Nat (12), Phra Nakhon Si Ayutthaya (3), Saraburi (1), Suphan Buri (30), Bangkok (15), Chachoengsao (11), Pathum Thani (3)

South 7 74 Phetchaburi (1), Chumphon (1), Surat Thani (30), Nakhon Si Thammarat (23), Songkhla (13), Satun (4), Phatthalung (2),

Total 37 391 10. Readiness preparation for water truck support

There are totally 503 of water trucks are supported in every region (93 for the North, 77 for the Northeast, 147 for the Central, East, and West, and 30 for the South). Moreover, another 156 of water trucks also are supported for the Mechanical Engineering Division (Nonthaburi Province).


Reported by Miss Ketsara Sinsap, General Administration Officer, Bureau of Water Management and Hydrology.

Verified by Mr. Methus Yuenpraphan, Irrigation Engineer, Professional Level, Bureau of Water Management and Hydrology.

Translated by Miss Arunee Chootip and Miss Kasinee Muangklom, Foreign Relations Official, Professional Level, Bureau of Project Management.

Royal Irrigation Department, Ministry of Agriculture and Cooperatives

weekly report for water watch during rainy season in 2020...

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