I do not know use of word partinate.  Regardless, there are quite a few climate models that show different scenarios and would have to be considered locally.  In general though, rainfall severity is expected to increase, but not all areas will be affected the same, some expected to have higher rainfall, some less.  Likewise land use changes, impervious surfaces and hydrologic modifications do generally increase runoff response, but the location of land uses and whether conservation measures such as BMPs and responsible management were applied may make a difference.  Dams also vary on how they were constructed and managed, some with overflow channels, clay core if earthen or other protection measures, some not well designed.  Some dams are ill maintained, leaving trees to grow in the dam, structures to manage water levels plugged, beaver or other sediment and organic accumulation impacts that plug up structures. You did not state why you wanted info, to protect from failure (ie, floods), to manage for agricultural uses, water for animals, for recreation, fisheries, or all of above.  There are quite a few hydrologic models, evapotranspiration models, climate change models, land use effects models.  In college I used the Thornthewaite-Mather evapotranspiration model to balance water monthly rainfall, streamflow, evaporation and transpiration demand.  That may help you.  Runoff = rainfall - evapotranspiration - deep seepage.  The problem with monthly is if you have high rainfall at end of month, its effects are going to extend into next month.  I uploaded a 2013 researchgate report I had on removing a failing dam, that may help.

Respected William F. Hansen I am much thankful for your kind response and sharing of knowledge. BY partinate  I mean Partitioning the Effect of Climate Change and Human Activities on Surface runoff. I want to find contribution of land use change and climate Change on surface runoff in percentages. It can be done by using SWAT, SIMHYD, etc. Every model requires daily rainfall and daily runoff data which is not available for my study area.  Is there any model which has only monthly data requirements or is there any  technique using which we can convert monthly rainfall and runoff data into daily?  I found your report it is interesting and I hope it will answer my question.

maybe try USLE (Universal Soil Loss Equation) model => iti is not necessary to have daily rainfall data.