Rapid Assessment for Resilient Recovery and ... - GFDRR

Province
Total No.
of Wells
No. of
Flooded
Wells
No. of Wells
with minor
damage
No. of
Unusable
wells
No. of wells
with damage to
intake cover
Total
damage
(THB mill.)
Kalasin
153
49
20
10
56
8.1
Khon Kaen
177
48
51
19
72
14.9
Phichit
2,072
450
79
114
14
2.2
Chachoengsao
364
164
151
6
29
8.7
Phitsanulok
1,499
396
156
106
31
86.3
Ubon Ratchathani
1,340
635
135
30
38
34.3
Roi Et
395
187
110
22
32
20.2
Si Sa Ket
785
245
34
38
29
36.6
Nakhon Pathom
462
170
147
3
56
8.1
Samut Sakhon
204
156
79
7
72
7.7
Maha Sarakham
207
198
124
22
25
17.9
Total
7,658
2,698
1,086
377
454
244.93
Note: Estimation of total damage was extrapolated based on these figures.
Damage to the urban water supply sub-sector remained relatively low: MWA reported that
a siphon was damaged at the canal Khlong Bang Luang in Bangkok, the cost of which was
estimated at THB 30 million. In addition to the siphon, various transmission pipelines may
have been damaged around the city, because of rushed and unplanned excavations and
sandbagging to prepare for floods. No cost estimations were provided for this damage.
Apart from this damage, all Bangkok water treatment and distribution facilities are working
normally, as are all 16 pumping stations across the city, thanks to the extensive protective
measures employed.
Table 27: Examples of
damage to groundwater
water supply systems in
rural areas
In other urban areas across the remaining 23 affected provinces (excluding MWA-run
facilities in metropolitan Bangkok, Nonthaburi and Samut Prakan), the main damage was
concentrated on water intake structures and water treatment systems (THB 38 million
total). Damage to conveyance, storage and distribution systems were significantly lower
at THB 1.9 million. Out of five PWA-run water treatment plants in Nakhon Sawan province
that take raw water from the Nan, the Ping and the Chao Phraya rivers, one was affected
by the floods during September to November (totaling two months), damaging part of the
pipe crossing the river.
Despite the lack of municipal-run water utility data, a field visit to Nakhon Sawan municipal
water supply system offered an indication of damage: two high-pressure pump houses,
including motors, pumps, a water quality control station and a control panel. Other
damage included a drilling rig and other equipment in the maintenance house, a transformer,
buildings, fences and pipes. This damage, although disruptive, did not seriously affect the
service provision to customers.
90 THAI FLOOD 2011 RAPID ASSESSMENT FOR RESILIENT RECOVERY AND RECONSTRUCTION PLANNING