Khun Dan Prakan Chon Dam

         On December 4, 1993, on the occasion of the royal birthday, His Majesty King Bhumibol Adulyadej delivered a speech to the Ministry of Agriculture and Cooperatives, and the Royal Irrigation Department (RID) to consider the project of Khun Dan Prakan Chon Dam at Ban Tha Dan Village, Hin Tung Sub-district, Mueang Nakhon Nayok District in Nakhon Nayok Province. The purpose is to help relieve the frequent floods in the area of Nakhon Nayok River with an irrigation system, help citizens to have water for agricultural activities and consumption, solve the problem of acid soil, and give citizens a better quality of life. On June 2, 2001, His Majesty King Bhumibol Adulyadej along with Princess Maha Chakri Sirindhorn graciously laid the foundation stone for Khun Dan Prakan Chon Dam.


Background of Khun Dan Prakan Chon Dam Project

         The watershed is influenced by the southwest monsoon between May and October which results in heavy rainfall around 1,500 - 2,000 millimeters per year or 87 percent. From June to October, it is also a period when the streamflow is highest at 93 percent of the average year-round streamflow. The rainfall creates floods which cause damage to households, rice fields and agricultural areas. The reservoir cannot store all surplus water, and although the watershed has small and medium irrigation systems such as diversion dams, it is not enough to prevent flooding during the rainy season, nor enough to be stored for use during the dry season. In some areas that experience long periods of flood alternating with drought, the condition of the soil becomes acidic called “acid soil” which causes serious damage to farming products in Nakhon Nayok Province. For this reason, the Khun Dan Prakan Chon Dam Project is determined to solve the problem of flood, drought and acid soil by developing a water source and large irrigation system that can store and allocate water orderly with enough water for various activities in and around the area of Nakhon Nayok River.


Dam and Building Features

Location Hin Tung Sub-district, Mueang Nakhon Nayok District, Nakhon Nayok Province
Dam type Roller compacted concrete dam
Dam height 93 meters
Length 2,594 meters
Dam crest elevation +112 meters (MSL)
Storage level +110 meters (MSL)
Reservoir's storage capacity at storage level 224 million cubic meters


Other Buildings

  • Spillway - highest drainage 1,454 cubic meters/second
  • Bottom outlet - highest drainage 182 cubic meters/second
  • River outlet - highest drainage 42 cubic meters/second
  • Irrigation outlet - highest drainage 6.05 cubic meters/second


Khun Dan Prakan Chon Dam Hydropower Plant

         The Khun Dan Prakan Chon Dam Hydropower Plant is a cooperation project on renewable energy between the Electricity Generating Authority of Thailand (EGAT) and RID to use the water from the dam for maximum benefit according to the government’s power strategy in September 2003 to support the development of renewable energy to lessen the import of fuel.

         In December 2003, the cabinet announced the policy to support the construction of small hydropower plants downstream of RID dams to generate power from the normal releasing of water. The Ministry of Agriculture and Cooperatives were assigned as the responsible party with RID giving support on the technical aspects of planning and development. Therefore, RID and EGAT, assigned by the Ministry of Agriculture and Cooperatives, and the Ministry of Energy respectively, cooperated to achieve the objective according to the strategy. EGAT was committed to developing small hydropower plants downstream of RID dams totaling 6 dams with a total capacity of 78.7 MW. EGAT received approval from the cabinet for the construction of the project on December 12, 2006. The Khun Dan Prakan Chon Dam Hydropower Plant was one of the 6 projects approved by the cabinet.


Power Plant Building

         The building structure is reinforced concrete. It is located to the right of Khun Dan Prakan Chon Dam and is 12 meters wide, 20 meters long, and 18 meters high. The water pipe brings water into the generator. It is a steel pipe with a diameter of 2 meters. It is 60.5 meters long and is connected from the spillway to the original river of the dam. The water used to generate power is released back into the river to be used in the irrigation system. The generator installed is the Horizontal-Shaft Francis Turbine. There is one unit, and the installed capacity is 10.7 MW. The average amount of water used to generate power is 17.66 cubic meters per second at the height of 66.65 meters. The power generated is sent to the Provincial Electricity Authority’s 22 kV transmission system to be used in Nakhon Nayok Province and the surrounding areas. The average capacity is around 27.99 million kWh per year.



  1. Reduce the use of fuel that affects the environment
  2. Generate electricity from clean energy 27.99 million units/year
  3. Decrease fuel import
  4. Support the study and research of renewable energy
  5. Increase the total capacity of the country
  6. Create jobs for locals during the construction
  7. Strengthen stability for the power system


Attractions Nearby

  1. Nang Rong Waterfall
  2. Wang Ta Krai Waterfall
  3. Sarika Waterfall
  4. Khun Dan Prakan Chon Dam
  5. Luang Phor Pak Daeng Temple
  6. Prapiganesh National Park


May 2018