The major and minor field drains are required for the discharge of mole drains (Rittie 2000) and the storage of runoff.
The input of this brackish water is carefully managed so that it does not enter mole drains where it would greatly impact the salt-sensitive cane crop.
Our results indicate that when considering the rapid transmission of microbes to ground or surface waters, the nature of the soil hydraulics should be considered as well as the conventional theory of direct entry via the slot of a mole drain. If contamination of waterways is to be reduced, overcoming the consequences of bypass flow in these widespread loessial soils is an important challenge both for researchers and local practitioners.
Anecdotally, within Southland, this type of drainage system has often been blamed for rapidly delivering microbial contaminants to waterways by removal of surface water to mole drains via the rip line or slot of the mole plough.
Mole drains are commonly pulled above the fragipan to help drain the upper profile, and our lysimeters penetrated down to just above the fragipan.
This discrepancy may result from the assumption of an initially well-mixed soil system to mole drain depth, whereas the actual soil [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] concentration on 28 May 1990 decreased with depth.
A simplified analysis of soil water flow to a mole drain. Journal of Soil Science 41, 189-98.
Two models for the leaching of a non-reactive solute to a mole drain. Journal of Soil Science 42, 565-76.
Heng LK, White RE, Bolan NS, Scotter DR (1991) Leaching losses of major nutrients from a mole drained
soil under pasture.
RACING at Punchestown yesterday was abandoned after the first race in the interests of safety after mole drains on the track collapsed following heavy rain on Sunday night and yesterday morning.
executive Charlie Murless, the mole drains were put down after the big
After a group of trainers emerged from the stewards' room, Dermot Weld said: "The mole drains collapsed and the track isn't safe for racing.