Laserfiche WebLink
• Discharge flow basis for emergency spillway capacity evaluation(for a Class B pond): <br /> • 100-yr, 6-hr peak flow+0.12 (PMP, 6-hr peak flow- 100-yr,6-hr peak flow) <br /> • Discharge flow basis for impoundment freeboard evaluation(for a Class B pond): <br /> • 100-yr, 6-hr peak flow+0.4(PMP, 6-hr peak flow- 100-yr, 6-hr peak flow) <br /> TABLE 5 <br /> IMPOUNDMENT HAZARD ANALYSIS SUMMARY <br /> IMPOUNDMENT HAZARD SPILLWAY FREEBOARD <br /> CLASSIFICATION/BASIS CAPACITY EVALUATION <br /> EVALUATION BASIS1/RESULT/ <br /> BASIS1/RESULT FREEBOARD <br /> Streeter Pond B/Proximity to State Highway 13 Class B/Ok Class B/Ok/0.25' <br /> Work Area Pond A/Agricultural Land Class B/Ok Class B/Ok/1.55' <br /> Gossard Pond A/Agricultural Land Class B/Ok Class B/Ok/6.46' <br /> Stoker Siding Pond A/Agricultural Land Class B/Ok Class B/Ok/3.64' <br /> Rail Loop Pond A/Agricultural Land Class B/Ok Class B/Ok/1.82' <br /> Prospect Pond B/Proximity to State Highway 13 Class B/Ok Class B/Ok/0.61' <br /> West Pit Pond A/Agricultural Land Class B/Ok Class B/Ok/2.47' <br /> Section 16 Pond B/Proximity to State Highway 13 Class B/Ok Class B/Ok/0.96' <br /> East Taylor Pond A/Agricultural Land Class B/Ok Class B/Ok/0.76' <br /> Taylor Pump Holding A/Agricultural Land Class B/Ok Class B/Ok/0.91' <br /> Pond <br /> Notes: t Spillway capacity and freeboard for all ponds were evaluated for a uniform worst-case <br /> hazard classification(Class B) <br /> The results of the WWC impoundment hazard analysis indicate that emergency spillway capacities and <br /> available freeboard for all existing ponds are adequate to affect full compliance with applicable <br /> requirements under the guidelines of TR-60, based on the applicable hazard classifications. Given this <br /> confirmation of compliance, no modifications to the existing emergency spillway structures are required. <br /> 5.0 POND DESIGN EVALUATION RESULTS <br /> The results of the pond design analyses are summarized in Table 6. The supporting SEDCAD4 analyses <br /> and watershed maps are presented as attachments in each of the individual pond design sections <br /> Exhibit 7 Page 8 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />