Trend and stationarity analysis conducted for the city center of Eskisehir province, Turkey. The Intensity-Duration-Frequency (IDF) curves and formulas for the estimation of the design rainfall intensity have been developed. Through the application of four different frequency methods, the IDF has been developed for a record of 64 years. The functions employed are; Normal, Log-Normal, Gumbel, and Log-Pearson Type III. A formula for each function developed by determining the parameters with the help of a non-linear regression method. The most appropriate fit of probability distribution determined by goodness of fit test i.e. Chi-Square. The results of the study revealed no evidence of significant trend or nonstationarity in any duration. With an exception to the Normal function which exceeded the critical region in several durations, all the functions found to show high fitting. LPT III identified as the best fit. The coefficient of correlation for the developed formulas found high in all the functions except for LPT III. The study endorsed that the estimation of rainfall intensity for any storm duration and return period can be done for Eskisehir using LPT III and Gumbel formulas as they are evaluated as best fitting.

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Dams have been used as a recharge method in Saudi Arabia.A previous study conducted on a recharge dam in Central Saudi Arabia showed that it is efficient at infiltrating water from its bed. However; water may infiltrate but not be effective downstream. In this paper groundwater flow downstream from Al-Amalih Dam in Central Saudi Arabia was calculated for a three-year period. This was then compared to the infiltrated water The components of flow around the dam for the entire three years are discussed and presented in this article.

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