mains and laterals neatly planned
herringbone pattern or even fanned

salt-glazed carriers carrying shit
simple land drains topped with grit

clay tiles in the farmer’s soil
sometimes flexi wavy coil

porous concrete or perforated
the flow of water calculated

twin wall pipes, long radius bends
junctions, our useful friends

rodding eyes, a socket plug
open drains, just shallow dug

bottle gulleys, gulley traps
elbows, saddles, neat end caps

grids and grating, vermin gates
silt traps, attenuation crates

hollow tining, vertidraining
french drains, useful when it’s raining

mole drains, compact soil fork-tined
sewers, culverts, some combined

slot drain channels, thin sand slitting
drains with silt continually sticking

trapped gulleys, recessed covers too
systems tricky to construe

inspection chambers, concrete rings
catchments catching natural springs

yard gulleys, soakaways, reducers
manholes, the sinister seducers

field drains, clay tiles, rigid plastic… 
drainage for the enthusiastic