07/10/2002 P&Z Packet - Laserfiche WebLink

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• Drainage Review for Page 2 June 21, 2002 Russian Baptist Church 3. An existing conditions drainage area map needs to be submitted. Proposed condition drainage areas are shown on the grading plan. Supporting drainage area map has been provided. 4. The proposed outlet control structure detail shows a treated wood weir in the proposed structure. This weir will need to be concrete. The outlet control structure detail has been revised to show a concrete weir. 5. In order for the top of Pond #1's outlet control structure to be considered as an emergency overflow, the outlet pipe from the control structure will need to be a minimum size of 15" RC pipe. The outlet pipe has been increased to 15" RC pipe. This allows the top of the structure to be considered as an emergency overflow. • 6. What elevation and where is the emergency overflow for Pond #2? • Overflow locations have been added to the grading plan. 7. Drainage easements are required around all ponds and wetlands. They need to be shown on the grading plan. Drainage easements have been added to the plan. 8. Does the City want to control when the Erosion Control measures can be removed? If so, some of the language on the grading plan will need to be changed. The Erosion Control notes have been revised stating the City will give approval for the removal of the Erosion Control measures. 9. To help control erosion at the outlet pipes, the pipes should be designed so that the maximum velocities do not exceed 6-feet per second. Also, rip -rap will need to be placed at the end of the outlet structure. A detail should be shown on the grading plan. The outlet pipes have been revised to restrict the maximum velocities to 6 feet per second. The required rip -rap location and detail has also been added to the grading plan. 10. Have soil borings been taken? If so, what is the water table elevation?