Using Fig. 1, estimate the percentage of rainfall that would be lost to depression storage...

Using Fig. 1, estimate the percentage of rainfall that would be lost to depression storage for a 10-acre parking lot having a mean slope of 1%. Repeat for a slope of 3%. Using the total rainfall volume determined in Problem 1, estimate the equivalent depth over the area of the depression storage loss for both slopes. State depths in millimeters and inches.

Problem 1

Estimate the percentage of the total volume of rainfall that is indicated as depression storage in Fig. 5.2.

FIGURE 1

Depression storage loss versus slope for four impervious drainage areas (from Viessman [14])