How did Egyptians store and deliver water to their fields?

The ancient Egyptians tried to trap as much flood water as possible, so they did not have to constantly get water from the river. They built mud-brick reservoirs to trap and hold the water. They also had a network of irrigation canals that filled with water during the flood and were refilled from the reservoirs.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; randomized controlled trials;