Analysis of water shortage in paddy field area using CROPWAT and SCS-CN method in ungauged station. A case study of Chun District, Phayao Province

Abstract

              Analysis of water shortage in paddy field area using CROPWAT and SCS-CN  method in ungauged station.  A case study of Chun District, Phayao Province.                                                                                                                                      The objective is to study using runoff quantity of rice planting area by  analysis  of  runoff  curve number analysis (Soil  Conservation  Service  Curve Number : SCS-CN) Combined with water use of plants  by  CROPWAT and  analyze  the amount  of  water and the water demand of plants in  the rice fields in 2014  and 2016.  To find the  relationship  between water costs and water demand of rice.                                                                                                     The  results  showed  that when the quantity of runoff in both years and the actual rainfall value  and  maximum runoff value to plot the graph with rice water usage demand data from  the beginning to  the final phase. Results of the analysis that in 2014 ,early July to August Is a period that has enough  runoff  to use the water of rice fields but there are still some areas that are in crisis in  7  subdistricts of July August There are crisis areas in 4 subdistricts. Found  that the most critical area of the 2 months is Phra That Khing Kaeng Subdistrict and in the year 2016,  it was found that during the month of July  -  August Is a period that has enough runoff to use the water of rice fields but still there are some critical areas in 7 sub - districts, found that the most critical areas are Chun sub-district.