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Extended Detention Basin Project: Firm : Date : No. YES N/A Deviation Requested Montana Post-Construction Storm Water BMP Design Guidance Manual - Extended Detention Basin 5.7.1 Description 5.7.2 Performance 5.7.3 Site selection 5.7.4.1 Basin storage volume 5.7.4.2 Basin shape 5.7.4.3 Basin side slopes 5.7.4.4 Inlet 5.7.4.5 Pretreatment forebay 5.7.4.6 Trickle channel 5.7.4.7 Micropool 5.7.4.8 Outlet structure 5.7.4.9 Initial surcharge volume 5.7.4.10 Trash rack 5.7.4.11 Embankment and overflow spillway 5.7.4.12 Maintenance access 5.7.4.13 Guidelines for incorporating flood control 5.7.5 Vegetation considerations 5.7.6 Construction considerations 5.7.7 Maintenance 5.7.8 Plan view and typical details Section references on this sheet are to the Montana Post-Construction Storm Water BMP Design Guidance Manual. Please also refer to section 7.1.4.B of the CK Standards for CK modifications to the BMP Manual. Deviation requests noted on this form shall be submitted for review and approval in accordance with Section 3.3 of the Design and Construction Standards. Deviations not individually approved, even if shown in the approved plans, specifications, or reports, are not approved.