Question

What was done to ensure that a flooding event like the Tulsa Memorial Day Flood never occurred again?

a. Tulsa was artificially elevated through new construction techniques.
b. Channels and storm-water retention sites were built along Mingo Creek.
Two large-scale dams were constructed, creating Tulsa's lakes.
d. Mingo Creek's course was diverted 20 miles upstream.
C.

Answer 1

the answer is:

(B.) channels and stormy-water retention sites were built along mingo creek.