I'm having problem in simulating future land use and land cover (LULC) scenarios. In this simulation, I only adjust the Curve Number (CN) for each the scenarios in the HEC-HMS. However, the peak discharge of all the scenarios is quite same and did not have drastic change for each the scenario (low in afforestation, medium afforestation, extreme 1, extreme 2 and extreme 3(deforestation).
Just a guess, but in any simulation model, depending on the described situation, it is entirely possible that some input(s) could dominate in relation to the the others, to the extent they have almost no influence at all - ie. the forestation factor contribution may be overwhelmed by extremes of morphological factors like slope, the soils, or the weather patterns ( we have an area nearby which has mountainous 'V' valleys, impervious clay soils, and 273+ inches of near continuous rain a year, so trees or not doesn't make much difference).
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