Details are as follows: precipitation (Rainfall) in this study used the average rainfall in the lessons of 30 years (2527 (1984)-2556 (2013)) air measurement station. Department of meteorology, the number of 12 stations to cover the area study found that areas of the basin, the Lam Kong trucker 42.95 per cent of the total area, or area 1,468.91 square kilometers. There is precipitation within the range 800 – 900 mm per year, which means the majority of the precipitation area, moderate amount of rainy day found that areas of the basin, the Lam Kong 100 percent of the trucker's total area is 3,419.85 square kilometers area, or. There are number of rainy days more than 90 days per year, which means a large area with the number of days that it rains a lot. Characteristics of soil texture, found that the majority of all areas, 44.89 percent as sandy soils is 1,535.13 square kilometers. The drainage of the soil found that large areas of the watershed Lam Kong trucker. The soil is well drained, 53.97 percent of the total area, or an area of approximately 1,845.66 square kilometres. Fertility of the soil, found that large areas of the watershed Lam Kong trucker. There are plenty of extremely low soil 65.29% of the total area or an area of approximately 2,232.81 square kilometres. Slope in river basin areas, found that the majority of the Lam Kong trucker basin area. There is a slope lower than 5% as a percentage of the total area or 79.38 is an area of about 2,714.72 square kilometers. The height of the ground. It found that the Lam Kong trucker basin area. Height above sea level of between 200-400 meters, 65.11% of the total area of 2,226.79 square kilometers, or. Utilization of land, found that in the year of the land utilization 2556 watershed Lam Kong trucker is mostly farmland, 64.02 percent of the total area of approximately 2,189.38 square kilometres. The utilization of land and forest areas is inferior to the natural flora of 18.24 percent, with the total area of approximately 623.81 square kilometres. The section uses the land for construction. Dwellings as a percentage of the total area, or 11.26 384.99 square kilometers. The land utilization types of soil where the open spaces are available. Homes, 4.93 percent of the total area of or approximately 168.43 square kilometers. The rest is water source area of the reservoir area wetlands. Percent of the total area, or about 1.56 53.22 km². The density of the Lam River basin area in Narita Kong density limits of between 0.5 – 1.0 km/sq km as a percentage of the total area, or 73.72 is 2,521.24 square kilometers. The distance from the source of irrigation, found that there area total area of 66.39 percent or approximately 2,270.49 square kilometres, more than 6,000 meters away from irrigation source.
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