The peak discharge of the watershed area under 2 years,\u00a010\u00a0years, 25 years, 50 years and 100 years rain\u00a0were simulated in the HEC-HMS program, using NOAA’s Point Precipitation Frequency Estimates for the Pierre region of South Dakota. The storm duration in this analysis\u00a0is 1 day under 1, 2,3,6,12 and 24 hours increment. The SCS curve number method was used to determine loss while SCS\u00a0Unit Hydrograph method was used to\u00a0transform the unit hydrographs in the analysis. From the previous study, a curve\u00a0number of 87 was determined for the model. The area of the watershed was calculated to be 0.61 square miles\u00a0while the average basin slope was calculated to be 2.08. A lag time of 57 minutes was also identified.<\/p>\n\n
| Rain Event<\/th> | Peak Flow<\/th>\n<\/tr>\n<\/thead>\n |
|---|---|
| 2 years<\/td> | 123.5 CFS<\/td>\n<\/tr>\n |
| 10 years<\/td> | 298.5 CFS<\/td>\n<\/tr>\n |
| 25 years<\/td> | 409.4 CFS<\/td>\n<\/tr>\n |
| 50 years<\/td> | 497.8 CFS<\/td>\n<\/tr>\n |
| 100 years<\/td> | 589.9 CFS<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n","protected":false},"excerpt":{"rendered":" The peak discharge of the watershed area under 2 years,\u00a010\u00a0years, 25 years, 50 years and 100 years rain\u00a0were simulated in the HEC-HMS program, using NOAA’s Point Precipitation Frequency Estimates for the Pierre region of South Dakota. The storm duration in this analysis\u00a0is 1 day under 1, 2,3,6,12 and 24 hours increment. The SCS curve number … Continue reading Peak Discharge Under Different Rain Events<\/span> |