-Inv. 928.5

4⁰

B.

1550'

Elev, 1035.0

787"

475

Stan

iv. 2 acre consists of gravel road

Inv. 970

i. 15 acres are wooded with poor cover

ii. 12 acres are treated cultivated land

iii. 4 acres are paved

b. Time of concentration based on:

Question 4 (8 points)

For the reservoir at the top of the figure (assuming it is 150 feet long by 50 feet wide):

Determine, via the Rational Method, whether the reservoir will reach the elevation

shown during a 100-year storm in the Denver, CO, area based on the following

characteristics of a drainage area flowing into it:

a. Cover based on Isabella soil, of which:

+

Elev. 990

i. Overland flow for 80 feet from Elev. 1096' to Elev. 1092', with

poor grass cover

ii. Shallow concentrated flow for 1500 feet to Elev. 1050'

iii. Stream flow via the shape in Question #2 to a height of 2.0 feet for

3500 feet to the top of the reservoir