ANS:E - All the above.

The correct statement from the options provided is: e. All the above. All the statements are accurate in the context of hydrology and stormwater management:

• The maximum rate of storm runoff is indeed called peak drainage discharge.
• The Rational method of estimating peak runoff can be used effectively for areas less than 50 hectares.
• The period after which the entire area starts contributing to runoff is termed the time of concentration.
• The time required by water to reach the outlet of a catchment from the most remote point is indeed called time of concentration.