FLOOD02408

• County: Statewide
• Community: Nationwide
• Basin: Statewide
• Title: Design Hydrographs for Very Small Wathersheds from Rainfall
• Date: 7/1/1962
• Prepared By: USDA Hydrograph Laboratory, Civil Engineering Section Colorado State University
• Floodplain - Doc Type: Educational/Technical/Reference Information

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Table 2. (Continued) Symbols and de1'initions of independent variables
for stepwise multiple regression analyses.

III. Conventional Rainfall Parameters
*~ Storm total, inches.

~
1)
R4
R5
l\s
R.y

Ra

~
~O
*~l
~2
~3
~4
11.5
11.6

Sl
S2
S3
S4

S5'
sa

*

P 0/10

P 10/20

P 20/30

P 0/30

P 30/60
Initial intensity, inches/hour.

Rainfall amounts received during
sequential periods of storm, inches.

15

I10

I15

130
160
Minutes after which intensity equals or exceeds 2 inches/hour.

Maximum rainfall intensities during
consecutive numbers of minutes, inches/hour.

::~ :~: I

= S7 l-~

Antecedent rainfalls, inches:
(Used with III and IV).

IV. Statistical Rainfall Parameters
Mean time in minutes after commencement of rain.

Standard deviation about the mean time, minutes.

= ~ = ~
2 ~

Average rainfall intensity, inches/hour.

Momental skewness of time

S6' S7 Antecedent rainfalls, defined above.

Storm total = ~ inches.

Denotes parameters which were used in the final regression equations.