The design rainfall intensity and its return period of the combined interceptor sewer is an important factor affecting overflow (CSO) occurrence. However, we often use ratio (or multiple, n0) to sewer, equivalent ignored. In this study, a low formula modeling method was proposed estimate period. First, new event separation approach especially developed, minimum interevent time (MIET) set concen...

abstract flood is among phenomena which result considerable damages to resources and is a serious issue among hydrologists. the proper estimation of runoff is necessary for designating appropriate approaches for its control or optimal management. various problems have been reported in application of empirical models. the regional analysis of runoff with different return periods by applying wate...

Abstract. When a natural hazard event like an earthquake affects region and generates catastrophe (NatCat), the following questions arise: how often does such occur? What is its return period (RP)? We derive combined (CRP) from concept of extreme value statistics theory – pseudo-polar coordinates. A CRP (weighted) average local RP intensities. Since CRP's reciprocal expected exceedance frequenc...

studying risk and frequency analysis of flood is done in order to design structures located in floody lands. in hydrological and water resources engineering projects, first of all, we should determine frequency of this phenomenon- their return period. in this research, the method of planning, the cumulative freguency curve is explained and probability and return period and errors concerning sma...