It is well-documented that urbanization results in significant hydrologic modification of urban catchments. Impervious surfaces (e.g., pavement, rooftops) lead to increased surface runoff, and artificial channels (e.g., storm drains) advect runoff quickly to stream channels. While we know that urbanization significantly alters the movement of water through the catchment, there is still a need to understand and quantify the effects of urbanization on different components of the urban water balance. My current research in urban hydrology is focused on understanding the relative partitioning of surface water to runoff, drainage, and evapotranspiration. Because significant heterogeneity in urban environments makes hydrology research difficult at many scales of the urban area, I have adopted an approach that attempts to constrain the problem as a starting point for estimating these modifications directly. This work will have applications in urban planning in alleviating urban flooding and urban heat islands, and in coping with water scarcity in drier climates.