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I I I I I I I I I I I I I I I I I I I Drawing No. I I I, Basin Map, shows the location, limits and size of 18 desig- nated sub-basins within the total Sloans Lake Drainage Basin planning area. Location: Teller Street between 24th and 26th Avenues Lakewood, Colorado The physical data for each of the 18 sub-basins is shown in Table A-I of Appendix A. The tributary area for each sub-basin varied from approximately 0.128 square miles (81.9 acres) to 3.743 square miles (2,395.5 acres) with an average sub-basin tributary area of approximately 0.721 square miles (461.4 acres) . Time: Spring, 1960 To facilitate the evaluation of intermediate points on the various drainageways within the Basin, 17 design points were selected to permit a more detailed hydrologic investigation. Drawing No. I II, also shows the location of the design points and corresponding sub-basins. Location: Saulsbury Street and 25th Avenue Lakewood, Colorado - DRAINAGE BASIN FLOOD HISTORY & FLOOD HAZARDS - Tirre: Spring, 1960 Historical Flood Information Information on historical floods in the Sloans Lake Basin was obtained through conversations with local residents, research of the historic files of the Denver ~, The Rocky Mountain News, the Denver Public Library and various U.S.G.S. publications. No stream gauging stations exist within the Basin and thus a record of peak discharges which have occurred within the drainage areas is unavailable. Little detailed information on past flood events for these developed drainage- ways Is available. In relation to historical flood damage events, the potential problem areas ident- ified in reaches F-G, F-L, and D-F are similar to problem areas Number 1, 2 and 3 respectively, as presented in the Neighborhood Storm Drainage Plan Planning Area I, June 1975. This report clearly presents the major drainage concerns of the residents of these areas and describes numerous specific flood related tragedies and damages which have occurred, sorre of which include: 1. Two deaths by drowning at a culvert near 20th and Harlan; 2. Flood Inundation of houses located In the vicinity of 20th and Ingalls Intersection; 3. Basement flooding west of Teller Street near 20th and 25th Avenues. Description of Flood Hazards Natural obstructions to flood flow include brush, trees, and other low- land vegetation which naturally grow along drainage channels and lowlands adjoining drainageways. During periods of high flooding, these obstruc- tions tend to slow the flood velocities and as a result, cause greater 5