hello, i think this answer you can find it in this link https://www.researchgate.net/post/How_can_I_calculate_daily_rainfall_intensity

You can sum the 24 hourly precipitation amounts and divide by 24 to get the average daily value, if needed for some reason. It is important to retain the detail records though, as daily precipitation intensities are often less desired than the hourly intensities.

Dividing daily cubic feet by 86400 seconds per day does yield the average daily discharge rate in cfs.

Book Filtre de Kalman discret à la modélisation Hydrologique