You may want to try using ...

You may want to try using natures physical and microbiological characteristics to resolve not only flooding but all environmental issues. Seems to have worked for the last 2 or 3 billion years. Every time  you look to a government or a man programmed computer for an answer you move farther away of the solution you seek.  For example FLOODING. Regardless if it is a 10 year or 1,000 year flood nature has the answer. TREES. #1 they are vertical! pull water away from flooded area rapidly. #2 Trees have a capacity of drinking and respiring up to 300 gallons a day AND depending on the species can survive on one gallon a day.  The only computer (in your head) should be how many trees of local origin to plant and maintain and follow their extraction capacity at their appropriate age.  Using this simple format of nature it makes it possible to grow food is deserts, increase nutritional density in our foods, and rebuild soil fertility. Nature will take care of the rest as long as we do not interfere with caustic chemicals. ;;;;;  Forgot to mention. It is free. nature does not require a UN study, taxpayer dollars, a multi layered commission. Your country, your people, your trees. Plant and maintain as many as you need. Nature will not overcharge you.