2005-03-23_REVISION - M1977424 - Laserfiche WebLink

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Subbasins Al and Al l contribute runoff to drainage structure D1, and dischazge from D1 outfalls off the Upper Bench ledge (cliff face) through discharge point DP1 into subbasin A7. The inlet time for subbasin Al is 36.38 minutes and the inlet time for A11 is 8.10 minutes. Since subbasin Al is hydraulically contiguous to subbasin Al I, the total inlet time is the sum of the two times or 44.48 minutes. Channel time in drainage structure D1 is estimated to be 1.01 minutes. The estimated total travel time is therefore 45.49 minutes. Subbasins A2 and A12 simultaneously contribute runoff to drainage structure DS2 which will outfall into subbasin A7 by way of pour-off DP2 (or DP1, depending on final grading). The inlet time for subbasin A2 is 35.98 minutes and the inlet time for A12 is 22.14 minutes. The estimated channel time in drainage structure DS2 is estimated to be 0.46 minutes. The lazger time of subbasin Al was added to the estimated channel flow time to arrive at a total travel time of 36.44 minutes. Subbasins A3 and A13 simultaneously contribute runoff to drainage structure DS3 which will outfall into subbasin A7 by way of pour-off DP2. The inlet time for subbasin A3 is 37.18 minutes and the inlet time for A13 is 14.76 minutes. The estimated channel time in drainage structure DS3 is estimated to be 1.08 minutes. The lazger time of subbasin A3 was added to the estimated channel flow time to arrive at a total travel time of 37.06 minutes. Subbasins A4 and A14 simultaneously contribute runoff to drainage structure DS4 which will outfall into drainage structure DSS at the Reseazch Mine bench. The distance for runoff to travel from the road (subbasin A14) to channel DS4 is approximately 12 feet, hence, travel time for runoff to travel from the road surface to the drainage channel is significantly less than that for runoff in the furthest part of subbasin A4. The inlet time for subbasin A4 is 38.10 minutes and the inlet time for A14 is 9.77 minutes. The estimated channel time in drainage structure DS4 is estimated to be 2.88 minutes. The larger time of subbasin A4 was added to the estimated channel flow time to arrive at a total travel time of 40.98 minutes. subbasin AS will dischazge runoff to a small section of drainage channel DSS immediately upstream of dischazge point DP3. Drainage channel DSS will consist of a widened and recontoured channel within the existing natural drainage at this location. Subbasins A4 and A14 will discharge runoff at this location through drainage structure DS4, and Subbasins A6 and A15 will discharge runoff at this location through drainage structure DS6. Because the Subbasins discharge to a common point, the inlet time for each subbasin will apply individually. The inlet time for subbasin AS is 105.97 minutes. The estimated channel time in drainage structure DSS is estimated to be 0.45 minutes. The total travel time for DSS is estimated to be 105.46 minutes. Subbasins A6 and A15 simultaneously contribute runoff to drainage structure DS6 which will outfall into drainage structure DSS at the Research Mine bench. The inlet time for subbasin A6 is 28.51 minutes and the inlet time for A15 is 19.36 minutes. The estimated Western Water 8. Land Inc.