Final answer:
A hydrogeologist would look for sediment or sedimentary rock with high porosity and high permeability in their search for a source of water for a housing development.
Step-by-step explanation:
As a hydrogeologist looking for a source of water for a housing development, you would look for sediment or sedimentary rock with high porosity and high permeability. Porosity refers to the open or void space within the rock, and sedimentary rocks tend to have high porosity due to the abundant spaces between the grains. Permeability refers to the ability of a geologic material to transport fluids, and rocks like sandstone and limestone are good aquifers because they are permeable.