Study results showed that when considering only the value of each type of soil water penetration on rain intensity is equal to the value soil and water absorption. Soil with high water absorption of Ks = 10-4 meters per second, the changes reduced safety ratio's (F.S.) faster than the value soil waterproof 5 m-10 medium = Ks per second and the soil with low water absorption of Ks = 10-6 metres per second, respectively, and showed that the intensity ฝ.The Plains have a lower value, the value soil waterproof overall, there will be a change of the ratio a little security, and change slowly, and when considering the intensity of rain that gradually increased until near or higher than the value soil water absorption of each found that the ratio of security will be even lower.When considering the timing (t ≤ 24 hours a day) showed that the ratio will decline rapidly, and considering the change in slope of the tilt of the Earth began found that soil slope tilt the lower ratio higher default security or say that the properties of the soil (the soil, in water) and the intensity of rain are the main factors that affect the stability of clay slopes because of rain water by the characteristics of the slope soil (sloping angle and thickness of chandin) as secondary factors that can affect the stability of soil slope. Test results of shear capacity of soil moisture, which found that the soil's shear capacity is variable, with inverse saturation of water in the soil. The value of productive tight connections are likely to decline sharply when humidity increases and internal friction angle values, effectiveness review are likely to decrease as the humidity increases significantly as well. Effect of soil slope stability analysis of the relationship between the saturation level (Degree of Saturation) over the pressure unit (Normal Stress) and shear (Shear Stress) to analyze the value soil moisture index (API) by means of a Slpoe Infinite analysis found that in the area of research with an average 26.5 degrees tilt at a security equal to ratio 1.0 LAT phibat soil saturation level 82-86 percent with the index, the moisture in the soil crisis 166.60, while millimeter 253.69 – analysis by mathematical model with the Bishop Simplified Method method, the ratio is equal to 1.0 security will be critical in soil moisture indexes 643.57 mm.
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