question 6 impact of urbanisation a catchment near adelaide kent town
Question 6: Impact of urbanisation
A catchment near Adelaide Kent Town is considering some development scenarios. Compute the
percentage increase in Q20 at the following three development scenarios (shown below). The
development area (Yellow) is 30% of the total catchment area (A₁-3ha). Runoff coefficients of the
development and un-development areas are 0.7 and 0.15, respectively. Travel time of the catchment
before the development is 40 minutes.
Three possible development scenarios are.
(a) Patchy development (tc after the development = 40 minutes)
(b) Upstream development (tc after the development = 30 minutes)
(c) Directly connected development ((tc for the developed area = 20 minutes)
Figure 5 for question 6
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