35% agricultural land in corn
30% pasture
21% forest
10% agricultural land in orchard
4% urban
If the threshold level for land use is set to 20%, HRUs would be created for pasture, forest, and corn. The areas of modeled land uses would be modified as follows:
corn: (35% ÷ 86%) x 100% = 41%
pasture: (30% ÷ 86%) x 100% = 35%
forest: (21% ÷ 86%) x 100% = 24%
where 86% was the percentage of the subbasin originally covered by pasture, forest, and corn.
The soil slider bar controls the creation of additional HRUs based on the distribution of the selected land uses over different soil types. This scale is used to eliminate minor soils within a land use area. As with the land use areas, once minor soil types are eliminated, the area of remaining soils is reapportioned so that 100% of the land use area is modeled.
For example, assume that the overlay performed by the interface during the land use, soil, slope overlay identified the following soil distribution for pastureland in the subbasin:
20% Houston Black
25% Branyon
15% Heiden
10% Austin
7% Stephen
6% Denton
5% Frio
4% Purves
3% Bastrop
2% Altoga