Astanga Hrudaya
चयादीन् यान्ति सद्योऽपि दोषाः कालेऽपि वा न तु। व्याप्नोति सहसा देहमापादतलमस्तकम्॥२९॥
At the same time, seasonal effect also may cause Dosha increase or decrease [Action of increased Dhosha –] When there is a flood, the water gushes into the cities very fast, but the reversal process is very slow.
english translation