Grand Lake Saint Marys, Ohio, Survey Report for Flood Control and Allied Purposes. Volume 2. Technical Appendix

摘要

Nonstructural flood plain management measures generally will not improve the flood problems for existing structures on the south shore, but regulations adopted by local governments either voluntarily or as required by participation in the flood Insurance program could be used to reduce damages to future development. Structural measures such as groins and shoreline levees (dikes) are not perceived to be economically feasible. Fixed breakwaters can be effective in reducing shoreline flooding and erosion, but economic benefits are derived primarily from the potential for increased visitation and not from flood damages reduced. Lake water quality problems related to nutrient and algae control appear better resolved through reduction of nutrient loads to the lake and in particular control of agricultural and livestock waste sources rather than by in-lake treatment approaches. Emphasis should be placed on the control of erosion and critical soil loss areas in the watershed and unprotected shoreline areas. An extensive lake-wide dredging program, besides being cost prohibitive, would result in no significant improvement in water quality or flood control storage. In-lake dredging of selected near-shore zones as is currently being performed should be contained for improving lake access and boater safety, public land development, and to keep pace with the current rate of sediment accumulation and redistribution.