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For cases that might indicate multiple barrels or parallel pipes, a coefficient was assigned by hand based on review of available data such as plans, maps, or Google Streetview. The coefficient represents the portion of the flow taken by each pipe. For example, if there are parallel 10\u201d pipes, then each gets coefficient 0.5 while if there is a 12\u201d and an 8\u201d then they are assigned 0.6 and 0.4, respectively. The flow accumulation grid provided the contributing upstream drainage area. The flow accumulation grid was developed by Halff for the city from a variety of sources of \u201cbest available data\u201d (terrain data). Pipe Capacity (cfs) / Drainage Area (acres) yields Inches/hourPipe capacity for a given area (Drainage Area) provides a pipe description in terms of inches per hour, which relates directly to rainfall intensities. In GIS, a bisect function is used to rank the results for each pipe segment into the following breakpoints:Grade F, 1.36 in/hr, 1 year return periodGrade D, 2.19 in/hr, 1-5 year return periodGrade C, 3.02 in/hr, 5-25 year return periodGrade B, 3.4 in/hr, 25-50 year return periodGrade A, 10.0 in/hr, beyond a 50 year return period- 10.0 inches is used to capture the upper bound of values in the results data.The bisect function, in this case, utilized breakpoints selected based on values of intensity from the Tarrant County Rainfall Data from iSWM for the 1-hour storm. The Letter Grade are based on a notion that a storm drain system that corresponds to the 1-year event is Poor, one that just conveys the 5-year may be adequate but is likely to result in flooding. Anything that conveys beyond 3 inches/hour is likely sufficient and may not merit further investigation, study or consideration for capital projects. The basis for this is from the Feasible Options Study conducted by Michael Baker Jr. lead by Burton Johnson. 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