Help! 翻译

室内地面排水坡度0.5％，坡向排水孔。
flooring drainage grade is 0.5%, slope direction weep hole.
室外砖砌排水沟200*200，长约6m。
the demension for ourdoor bricked drainage ditch is 200X200, the length is about 6m.
按实量计，沟内侧用1：3水泥砂浆抹面。
calculating according to real quantity, mud and sand with the ratio of 1:3 is needed to be plastered onto the inner ditch.