Drainage problems do not always originate from the lot or building itself but may be a result of offsite discharge or subsurface factors that are not perceptible to everyone. Determination of the cause of water intrusion will necessitate investigation of not only the symptom but hopefully determining the cause of a water/moisture problem. Hydrology in combination with civil engineering practices provides the practitioner with the necessary tools to arrive at a conclusion that not only determines the water source but also a remedial plan of repair to address the problem.