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The average pattern of weather, called climate, usually stays pretty much the same for centuries if it is left to itself. However, the earth is not being left alone. There is now very strong evidence that significant global warming can’t be explained by natural causes alone. Humans are changing the climate by their actions, especially through emissions of greenhouse gases, like carbon dioxide, which artificially warm the atmosphere of the earth. Scientific studies showed that climate change is fact not a myth or...

Many hydrological models have been developed by researchers to simulate watersheds’ hydrologic behavior. In the aspect of robustness and suitability of models to a certain watershed depends on the watershed’s conditions which are flatness, storage capacity of surface, climate, precipitation distribution and water table level. The success of model predictions related with the selection of the model which will be used for certain watershed. This comparative study investigates various hydrological models’ stren...

Wastewater treatment plant design calculation is complex and time-consuming task. The person who is in charge of calculations should be sure about the criterias about the unit to be sized and should use appropriate inputs. Vital point of design is generally using the best input within the range to have more sensible results. Web based design calculations of wastewater treatment plant software has been coded. PHP and JavaScript languages have been used to achieve these advantages. With the aid of error checking, th...