1-consumption of individual drops down
2-govt has to invest extra-ordinarily for rehabilitation of economic sectors
3-investment of country is effected
4-net exports are in deficit
all these components effect national income and economy is suffered
floods have very destructive affect to a country as they destroy the agricultural goods and livestock , factories and many houses are destroy in floods due to overflow of water into the city
Floods usually have devastating effects on the Economy of a country. Flood causes many disasters to land, property and people. It destroys whatever comes in its way. Flood destroys the crops and livestock thus limiting or completely eliminating their contributions to the economy. It also destroys road and railway networks in the affected area, So transportation of goods and people is effected, which also causes the economy to suffer. It destroys or damages buildings, factories, warehouses etc which often results in closing down of work in these places due to which not only the common workers suffer but also the industries suffer. Also, the government has to invest huge amount of funds and manpower in rehabilitation of people and industries, which also causes the economy to suffer at the national level.
And floods or any type of disaster damages of destroyed the economy badly.
Where as a question which is asked by you about the effects of flood on an economy, so dear when ever a flood comes it obviously destroyed the crops even it stops the progressive activities in a country.