The Sukhothai Operation and Maintenance Area is located on the Sukhothai Province. Plain on both sides of the Yom River near sawankhalok Distric,  about  38 km north of the Provincial Town of Sukhothai.

The Yom River Basin was development study which was completed in 1971 (2514)  The recommendations included

   1.Construct a storage dam at Huai Sak (Phrae),north of the Mae Yom Project.

   2.Construct a diversion dam at Kaeng Luang (Sr Satchanalai Sukhothai)

   3.However because of the high costand long construction period, NGO. From surveying and testing in Sawnkhalok and Srinakhon (Zone 1 + Zone 2) to  determine the  potential  for  groundwater development  and  suitable  aquifers.

            Zone 1 the best aquifer 1976 (2519)

            Zone 2 number 2 1979 -1982 (2522-2525)

                  The project was constructed in1976 (2519)

                   Finished in 1992 (2535)

                   Been operated for irrigation in 1982 (2525) 



The project consist of Zone 1  and  2

ZONE 1          

-  The area is located on the Sawankhalok Distric

-  Consist of 104 wells,Irrigation Area about  36,325  Rai (5,812 ha)

ZONE  2         

-  The area is located on the  Srinakhon  Distric

-   Consist of  100  wells , Irrigation Area about 32,300 Rai  (5,168 ha)

Note :             1 ha  =  6.25  rai

-  A well command area of between 300-350 Rai (48-56 ha)

-  1  Well have the farmer approximately 35  family.

-  1  well have 1 Pump operator get salary from  Rid. 



            -  In  parallel with the construction of the wells,The consult of Project,they do the Modelling  aquifer  Program  of  the  groundwater  system.  The  model  covers  an  area  of  some  1675  sq.Km  and  includes  both  Zone  1  and  2  development  areas.

            -  The  aims  of  the  model  are  to  indicate  potential  abstraction rates,possible long – trem effects on other groundwater users,and to aid in the planning of agricultural development of the area.

*  1  Year  could  provide 40 million  cubic  meters

            -  The  introduction of irrigation was designed to supply (Water  demand)  supplementary  wet  season  irrigation  thus  giving  farmers  the  potential  to  increase

    yields and reduce the giving farmers the rainfed crop production.In addition cropping could be intensified by the introduction  of  dry  season  irrigation. 



            The climate is of a tropical monsoon type,with 3 district seasons being  recognized : (Wet  season ,Cool  season  and  Hot )

- September is  normally the wettest  month of the year  with an  average monthly  rainfall  of  297  mm. Where the average annual rainfall  is 1220  mm.

- April  have the maximum potential evaporation  225  mm.

- January  have  the  minimum  potential evaporation  120 mm. 




            -  The wells vary in depth between 70 and 150 m.depending on the depth to bedrock,with a minimum spacing of 700-800  m. to  avoid  over-pumping.

            -  The  boreholes are 559  mm. (22”)  in  diameter 

            -  Cased Using  Glass Reinforced plastic  pipe (GRP) 0  14”  to a depth  of 30-45 m. 

and  reduce  to   0  10”

-  The  annular  space  is  gravel  packed.

-  The  sand  and  gravel aquifer sequences are screened (1 , 1.5 , 2.0 , 3.0 mm)

            -  The clay sequences  are  blanked.

            -  The  reliable yield of each well has been determined by pump testing following construction of  the borehole. 


            -  The  pumps  are  of  two  sizes  (35  l/s  and  55  l/s)

            -  The  pumps  are  of  the  multi-stage  vertical  turbine  type  connected  by  Line shafts  to  motors,  driven  by  electricity  supplied  from  PEA  (Provincial  Electricity  Autolity )  Sukhothai.

            -  The  motors  are  the  vertical , hollow  shaft type , rate at  30  and  40  KW , running  at 1470  rpm  and  operate  on  a  380  volt,  3  phase  50 HZ AC. supply

            -  The  water Flow  is  metered  at   the  pump  house  and  discharge  controlled  by  a  butterfly  vale.

            -  An  air  valve,  pressure  relief  valve  and  non-return  valve are  provided  to  prevent  damage  to  the  pump  or  distribution  pipework. 


            The  water  is  distributed  thought  a  buried  uPVC  pipe  network  of  10”  , 8”  and  6”  diameters ,  to  riser  boxes  controlled   by  a  mushroom  valve.  

A  stilling  basin  and  weir  are  included  at  the  riser  so  that  the  farmer  is  able  to  check  on  the  discharge.  The  riser  box  was  locate  at  an  appropriate  point  in  a  plot.



Upland  Areas  are  suitable  for  crops  such as  sugar-cane , maize , soybean , blackgram , groundnuts  and  cotton. 

Lowland  Areas  are  suitable  for  local  rice  variety  and  HYV  rice.