I am trying to understand how melt water from snow in urban setting gets routed.
I understand that for routing rain water, one can create grid and then determine the flow direction for each cell by using the D8 model. In the D8 model, first the slope for each of the 8 adjacent cells is calculated and then the direction of outflow corresponds to the direction of maximum slope. One can also compute the velocities with some approximations of the St. Venant equation.
I was trying to understand if it makes sense to use this model when :
- Runoff is because of snow melt in the absence of rainfall.
- Runoff is generated because of a rain over snow event.
Using the D8 model would mean that, in both of these cases, the snow melts, water percolates down the snow pack, and when it touches the land or water mass, the routing happens according to the current slope values.
Is this a reasonable way to characterize the meltwater flow?
If not, is there any literature where this problem is solved using any alternate technique?