density of trafficdental concretedentated silldenticulatedenudationdeoxygenationdeparture transitiondepletiondepletion curvedepletion perioddepletion ratedepositdepreciationdepreciation costdepreciation ratedepressed freewaydepressed highwaydepressed railroaddepressed roaddepressed sewerdepressiondepression headdepression springdepression storagedepthdepth area duration analysisdepth area duration curvedepth discharge curvedepth duration curvedepth factordepth of excavationdepth of flowdepth of flow sectiondepth of foundationdepth of penetrationdepth of submergencedepth of welldepth scale ratioderrickdesalinizationdescending gradedescription of projectdesertdesert erosiondesert pavementdesert soildesiccantdesiccationdesigndesign aircraft