inspection pitinspection shaftinspection wellinspireinstabilityinstability of soilinstantaneous field of viewinstantaneous unit hydrograph or iuh or iuhinstarinstrumentationinstrumentation and controlinstrumented anchorinsularinsulation testerintakeintake areaintake portintake spanintake structureintake towerintake wellintake works or intake work or intake workintegral drill steelintegrated geographical information systemintegrated land and water information systemintegrated powerhouseintegrated services digital network or isdn or isdnintegumentintensityinter alios or alios or aliosinter antennal sutureinter or tectonicinteractioninteractive digitizinginteractive editinginteractive modeinteractive processing or interactive or interactiveinteractive topologyinteravallumintercalenintercepting sewerinterceptometerinterceptometer of clarkeinterceptor sewerinterclary veinintercontinental riftinterferometerinterfingeringinterflowinterformational