A drainage study describes the general system conditions during a 1:100 year storm event, including flood water depths, flow direction, hazard classification and flow rates. Oftentimes survey or LIDAR data is cross referenced to confirm watershed catchment areas. Engineering models use historical studies of the watershed areas along with new data, to map drainage paths and evaluate the extents of flooded areas.
A drainage study can be completed for a broader region and include general, high level information regarding drainage flow paths and important waterbodies, drainage channels and outlets. Site specific drainage plans are often completed after, and based on, the overall drainage study to ensure there isn't a post development effect on drainage.
Corman Park has completed a number of drainage studies while some drainage studies are being coordinated at the regional level through the P4G planning district. All completed drainage studies are found under 'Important Documents'.