Drainage Pipe Comes in 200 Ft Long Rolls

Multiple Choice

Drainage pipe comes in 200 ft long rolls.The number of rolls needed to construct a uniform buried drainage system for a nearly level 20 hectare field will depend primarily on _____________.

A) the texture and structure of the soil
B) the slope of the drain lines
C) the annual rainfall
D) rate of capillary movement in the soil
E) the saturated moisture potential of the soil