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a. Estimate time of concentration in minutes if velocity of flood flow in ABDEC

18 / 01 / 2019 Physics

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he lower part of a catchment in Mt Helen, Ballarat, Victoria shown as trapezoid BDEC in Fig. Q3,
has undergone extensive urbanization. Pre-development runoff coefficient for the whole
catchment, ABDEC, is estimated 0.15 while post-development runoff coefficient for the lower part,
BDEC, has changed to 0.6. Runoff coefficient for the upper part of the catchment, ABC, remains
the same as that of pre-development. (Areas of ABC and BDEC are 125,000 and 250,000 m2
respectively).
a. Estimate time of concentration in minutes if velocity of flood flow in ABDEC
catchment longest floodway, thalweg, reaches a maximum of 1m/s.
b. Calculate flood peaks for 5 year return period at the outlet, G, for both pre and
post development conditions.
c. Calculate flood peak for a culvert to be installed as the minor system of the artillery
road shown on the map.
d. What would be approximate diameter of the culvert if its full flow velocity is assumed


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