DRAINAGE 



247 



of the flat lands, rich alluvial soil on the coast or near the 

 mouths of the river where the water is tidal, banks and 

 intercepting trenches, draining by self-acting sluice-gates 

 during low tides will also be required. 



Quantities \ arthtrark -JO cl . 



Per 10'run}Bri(Jc&Mortar46cl 



Jifatife Labourer 



M-e Mason, 

 vrould. do J5O ft 

 per day. 



/3 cl. 



Per JO'run. \BricM, &Jfortar-5-3cl 

 / Jfatu-e Labourer A 

 JVettu'e JUaaon- woul 

 do /4O feet per clay 



Sides ofaZL t^he- 

 I cttove^ sections can. 

 < be. heightened fy~ 

 I cuictinff bricks on, 

 I end' or sid&. 



FIG. 69. Sections of Drains. Quantities estimated as in the Malay 

 Peninsula, by Mr. W. J. Kenny. 



Such drainage is necessary for many agricultural pur- 

 poses, and the drainage required for rubber growing or 

 sugar plantations, as long as the drains are kept clear, is 



