Implement decaying D8 flow accumulation #389
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…/386-add-decaying-flow-accumulation Conflicts: HISTORY.rst
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This PR copies the modifications to D8 flow accumulation implemented for the NCI Water Quality project that allow for pixel loads to decay as they pass over the landscape. You could think of like a pollutant flowing across the landscape, where some fraction is absorbed due to landcover or some other factor.
Tests have been implemented and runtime should only trivially be affected when decaying accumulation is not in use. When decaying accumulation is used, there is an extra cost in memory and in iteration over the pollutant contributions to the pixel.
Fixes #386