double shell constructiondouble square junctiondouble stage trickling filterdouble suctiondouble suction pumpdouble wall cofferdamdouble white linedouble yellow linedoublingdoubly reinforceddove prismdovetail groovedoweldowel actiondowel bardowelled contraction jointdown hand weldingdowndragdowngradedowngradientdownhilldownpipedownstreamdownstream batterdownstream blanketdownstream control sectiondownstream facedownstream filldownstream toedownstream toe linedownstream wign walldowntime costdraftdraft tubedraftsmandragdrag coefficientdraglinedraindrain jointdrain openingdrain pooldrain tiledrain welldrainable porositydrainagedrainage areadrainage basindrainage benefitdrainage blanket
