When the Cookie Cutter Won’t Cut It

3. Project Locations Ironworks Dam Aqua PA Bucks County Youngman Dam WMWA Lycoming County Poe Dam PA DCNR Centre County

4. Project Comparison * Top of 3 ft high parapet Ironworks Dam Youngman Dam Poe Dam Max Dam Ht (ft) 51 95 33 Normal Storage (ac-ft) 1900 1600 460 Constructed 1941 1951 1935-38 Drainage Area (mi 2 ) 5.7 2.1 4.9 CN 79 67 65 Lag Time 0.8 0.4 1.2 24-hr PMP (in) 34.4 32.4 33.0 PMF Inflow (cfs) 44,900 20,400 28,000 Spillway Type Masonry Ogee/ Earth Auxiliary Concrete Ogee Masonry Ogee Spillway Length (ft) 110/200 70 60 Normal Freeboard (ft) 7/10* 8 9 Spillway Capacity (% PMF) 40/65* 60 20

6. Ironworks Dam – Site Layout Primary Spillway Embankment Aux. Spillway Central Dike Intake Tower Photo courtesy of Aqua PA

10. Auxiliary Spillway Core Wall

20. Poe Dam – Site Layout Outlet Tower Primary Spillway Photo from Windows Live Local Embankment

24. Poe Dam – Upgrading Approach RCC Armoring Replace Outlet Tower Parapet Photo from Windows Live Local Slipline and Extend Conduit Grout Spillway

30. Youngman Dam – Site Layout Outlet Tower Primary Spillway Photo from Google Earth Embankment

41. Case Study Comparison Ironworks Poe Youngman Selected Rehab Alternative Raise Dam + Expand Aux. Spillway RCC Embankment Armoring Raise Dam with Vinyl Sheet Pile Parapet Cost $1.6M $3.7M $1.1M Design Constraints & Objectives Modifications to Parapet and Aux. Spillway Req’d “ Seriously Inadequate” Spillway Capacity Large Drainage Area, Small Lake Small Drainage Area, Large Lake Cost effective, low impact solution

42. Questions