For the simple calculation method:
We apply the following function to our pervious area layer, other greenland area layer, water surface area layer and district area layer:
Run off = Precipitation*(district_area – waterbody_area)
– Evaporation*impervious_area
– Evapotranspiration*(pervious_area+greenland_area)
– Saturated water quality*(pervious_area+greenland_area)
– Drainage_rate*Sewer_buffer
With all data acquired, we do set a time line to our calculation as the saturated water quality is a constant value to a specific kind of soil yet the other two parameters is proportional to time. The time line will be 7 days with an interval of one day.
