Estimate of the discharge of the floods and their risks for wadi Jinnah basin in the north east of Maysan governorate Using geographic information systems GIS

Abstract

     The study to estimate aims size and drainage of pluvial waves the floods. Result for difficulty estimate waves of the floods in trough is valley of jinn to development of the methods shows from employed in estimate the quantitative floods and specification in the troughs other than observed and because of that use of several examples was complete from her example snaaydr (snyder ' s model) and example (Bransby  Williams) and example (Clark) and example  (Temez)   . For knowledge that. Used also in the searching (Spatilal  Analyst  Tools  Hydrology ) for specification borders friendly of area of the searching and measuring of the characteristics aalmwrfwlwjyt have fun, and good presentation of information around dhrwaat the air drainage and the planners aquatic (Hydrograph) in the dependency on analysis of the masts and space in in addition to use of example aaltDrs the numbers DEM)) in composition the geographical information to specifying courses of the valleys and characteristics of the troughs and trick her to digital maps and use of the analyses hydrologic through the examples athletic to aquatic estimating of size the floods in the troughs in shackles is complete in him imitation way of the hydrologic regime in the trough  . Notices that the calculated value for a period estimated response the trough aquatic for downpour of the rains (tp  "hr") in the hour for area studious , where registered lapse of time possible afflicted to falls in her the rains on trough is valley jinn (1.07) of hour and starts after her the shallow , flow while lapse of time possible become remote aantsqT in her the rains she (11.72) is hour. Just as palace period of the gradual rise for flow of the flood notices to ranges what between (1  -  15) hour consecutively, that afflicted and lapse of time for the gradual drop for flow of the flood for trough of valley become remote jinn (53  -  103) of hour consecutively