S/H Troughs

[taipan]

Hi
I would appreciate some info on designing a trough for S/H. The only plants that will be in there ( for the moment) are the wet loving Phrags eg Ph.hirtzii etc. the pots I have are clear plastic with holes at the bottom & a very thin slit about 2" high from just above the bottom of the pot. I would like to pump water from a reservoir into the trough on a continual basis. The trough is not very big approx 10 ft long & 14 inches wide. The trough will be in a small Glass house with Airconditioning ( set at 25 max) as it is located in Bangkok & the temps range from a bare minimum of 12 to 15 C at night for about 6 to 8 weeks with max temps. ranging from high twenties ( during those 6 to 8 weeks ) and mid 30's to low 40's for the rest of the year