A small watershed with 0.75 km^2 catchmentarea consists of25% Suburban with c=0.3818 % Single Family area with c=0.3512% Apartment Dwelling areas with c=0.6510% Playground with c=0.3515% Asphaltic Street with maximum value ofrunoff coefficientand 20% urban forest cover with 90%drainage area in good grassland, woodlandand tropical plants coverThe water course, 5.2 km in length has a fallof 50m. The IDF relation for the area isexpressed by the following relation7870.22i=(t+12)0.45where i is in cm/h, T (return period)is in yours , t is in minutes and time of concentration (tc) isgiven by the following equationtc= 0.000323L0.77 s-0.385 where tc is in hours„Length (L) is in meters and S is slopeEstimate the peak runoff in cubic meters persecond for 25 years return period using therational method formula.

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ea consists of % Suburban with c=0. % Single Family area % Apartment Dwelling % Playground with c=0 % Asphaltic Street witl noff coefficient d 20% urban forest co ainage area in good gr. d tropical plants cover

ea consists of % Suburban with c=0. % Single Family area % Apartment Dwelling % Playground with c=0 % Asphaltic Street witl noff coefficient d 20% urban forest co ainage area in good gr. d tropical plants cover

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Soil classification and characteristics

Soil classification is a method of categorizing soil based on its properties, types, and uses. The motive of soil classification is to arrange various types of soils and divide them into groups for various engineering and agricultural purposes. Soil classification is carried out by various agencies as per their purposes. From an engineering perspective, soil classification is done to find out the suitability of soil for various construction purposes like the construction of dams, foundations, highways, infrastructures, and so on. For engineering purposes, the soil is classified by the following systems:

Question

A small watershed with 0.75 km^2 catchment
area consists of
25% Suburban with c=0.38
18 % Single Family area with c=0.35
12% Apartment Dwelling areas with c=0.65
10% Playground with c=0.35
15% Asphaltic Street with maximum value of
runoff coefficient
and 20% urban forest cover with 90%
drainage area in good grassland, woodland
and tropical plants cover
The water course, 5.2 km in length has a fall
of 50m. The IDF relation for the area is
expressed by the following relation
7870.22
i=
(t+12)0.45
where i is in cm/h, T (return period)
is in yours , t is in minutes and time of concentration (tc) is
given by the following equation
tc= 0.000323L0.77 s-0.385 where tc is in hours
„Length (L) is in meters and S is slope
Estimate the peak runoff in cubic meters per
second for 25 years return period using the
rational method formula.

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