New fields titled RunoffRank and InfiltrationRank are added to the two models respectively. Where infiltration is highest based on land use, soils, and slope the rank is seven and decreases to one. Wetlands are eight and impervious features are zero. Ranks are opposite for the runoff features. The lowest runoff is one, increasing to seven. Wetlands receive a value of zero and impervious surfaces eight. If the two models are equal, the two ranks should add up to eight and the difference between the two ranks equals zero.
The greatest inconsistency is found in soils with the A hydrologic property (Appendix E). Blue bars of the A soils represent most discrepancies between the infiltration and runoff models. Interestingly, as the hydrologic conditions of the soil decrease so does the variability between the two models. The runoff and infiltration models depicting C and D soils largest rank difference is three, and the B soil property is never larger than four. In addition, as human influences increase, the more synonymous the two models become. Areas with commercial, industrial, or urban residential housing never have a rank difference of more than two, regardless of soil type. As permeability and porosity of soil or infiltration of land use increases the higher the conflict between the acknowledged runoff model the potential infiltration model.
Several conditions promote this outcome. The runoff and infiltration model both use the same impervious surfaces layer. Road, highway, building, and parking lot features correspond in both models when intersected. A rank difference of zero is anticipated to occur in high impervious areas. Runoff should increase as infiltration decreases due to the complete overlap of the man-made structures in both models.
The elements of nature become more difficult to replicate. The runoff model simply states that a curve number is associated with the intersection of soil and land use. Slope only affects the time it takes surface water to runoff or infiltrate. The infiltration model takes all three parameters into account. The infiltration model shows 100 percent runoff in steep slopes and complete infiltration in low slopes, when soils textures are A and vegetated.
Figures 16 and 17 display the impact slope has on the difference between the infiltration and runoff models. Where slope is steep, 83 percent of error is considered high; this is when the rank difference between the infiltration model and the runoff model values are six, seven, or eight. Only
17 percent of highest error is derived from low to moderate slopes.
Figure 17 represents both moderate and high error, rank differences of four to eight. 90 percent of moderate to high error is represented by one of the extremes, either low or steep slope. Moderate slope yields only 10 percent of this error.
New fields titled RunoffRank and InfiltrationRank are added to the two models respectively. Where infiltration is highest based on land use, soils, and slope the rank is seven and decreases to one. Wetlands are eight and impervious features are zero. Ranks are opposite for the runoff features. The lowest runoff is one, increasing to seven. Wetlands receive a value of zero and impervious surfaces eight. If the two models are equal, the two ranks should add up to eight and the difference between the two ranks equals zero.The greatest inconsistency is found in soils with the A hydrologic property (Appendix E). Blue bars of the A soils represent most discrepancies between the infiltration and runoff models. Interestingly, as the hydrologic conditions of the soil decrease so does the variability between the two models. The runoff and infiltration models depicting C and D soils largest rank difference is three, and the B soil property is never larger than four. In addition, as human influences increase, the more synonymous the two models become. Areas with commercial, industrial, or urban residential housing never have a rank difference of more than two, regardless of soil type. As permeability and porosity of soil or infiltration of land use increases the higher the conflict between the acknowledged runoff model the potential infiltration model.Several conditions promote this outcome. The runoff and infiltration model both use the same impervious surfaces layer. Road, highway, building, and parking lot features correspond in both models when intersected. A rank difference of zero is anticipated to occur in high impervious areas. Runoff should increase as infiltration decreases due to the complete overlap of the man-made structures in both models.The elements of nature become more difficult to replicate. The runoff model simply states that a curve number is associated with the intersection of soil and land use. Slope only affects the time it takes surface water to runoff or infiltrate. The infiltration model takes all three parameters into account. The infiltration model shows 100 percent runoff in steep slopes and complete infiltration in low slopes, when soils textures are A and vegetated.Figures 16 and 17 display the impact slope has on the difference between the infiltration and runoff models. Where slope is steep, 83 percent of error is considered high; this is when the rank difference between the infiltration model and the runoff model values are six, seven, or eight. Only17 percent of highest error is derived from low to moderate slopes.Figure 17 represents both moderate and high error, rank differences of four to eight. 90 percent of moderate to high error is represented by one of the extremes, either low or steep slope. Moderate slope yields only 10 percent of this error.
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