Source: http://www.iowadnr.gov/InsideDNR/RegulatoryLand/DamSafety.aspx
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You Are Here > Inside DNRRegulatory - LandDam Safety
Dam Safety Program The Iowa DNR is responsible for the state's dam safety program. The program involves the review and approval for the construction of new dams, maintaining an inventory of existing dams that meet minimum size criteria and the periodic inspection of certain dams. Currently there are approximately 3800 dams on the state's dam inventory.
Jon Garton (515-725-8360; Jonathan.Garton@dnr.iowa.gov).
Dam Classification In Iowa, dams are classified according to the downstream damages that would occur if that dam were to fail. The more risk, the higher the standards that have to be met when that dam is constructed or modified. There are 3 dam classifications: High Hazard, Moderate Hazard and Low Hazard. These classifications do not describe the current condition of the dam. High Hazard class dams have to meet the state's highest level of criteria and are inspected on a 2 year cycle.
Inspection The purposes of dam inspections are as follows:
Evaluate the construction, operation and maintenance of dams Identify observable deficiencies in dams or appurtenant structures Identify other flood plain structures or uses which may affect the hazard class of a dam or use of an associated impoundment Dam Inspection Guidance Dam Inspection Checklist Operation & Maintenance
Maintenance Manual for Dam Owners Emergency Action Plans
Identifies the area below the dam that would be flooded from a failure, Establishes lines of communication for the dam owner and emergency response personnel, and Provides for warnings and evacuations to be conducted by police, fire, and rescue teams. As the dam owner, you are responsible for developing and maintaining the EAP and for updating it on annual basis. The importance of meeting with your local emergency management agencies at least once a year cannot be overstated. This meeting ensures that everyone understands the EAP, including pre-planned emergency procedures and inundation maps. Once completed, the EAP should be submitted to this office for review and approval.
Lake Delhi Failure Investigation by the Independent Panel of Engineers
After the failure of the Lake Delhi Dam in July of 2010. An Independent Panel of Engineers was formed to investigate the failure. The final report from the panel is available at the links below:
Main Report (5 MB PDF) Appendix Part 1 (3 MB PDF) Appendix Part 2 (7 MB PDF) Appendix Part 3 (7 MB PDF) Lake Delhi Dam Reconstruction Design Alternatives Report
In September 2011, the State of Iowa provided funding assistance to the Lake Delhi Combined Recreational Facility and Water Quality District to complete a study determining the feasibility of repairing the dam, restoring Lake Delhi, and bringing the facility in compliance with current dam safety and design standards. This report was submitted to the State on December 21, 2011. It can be reviewed via the links below. Main Report
Appendix A Field Investigations and Data Collection
Appendix B Hydrologic and Hydraulic Studies Report
Appendix C Geotechnical Analysis and Design_Part1
Appendix C Geotechnical Analysis and Design_Part2
Appendix D Structural Analysis and Design
Appendix E Archaeological Reconnaissance Report_Part1
Appendix E Archaeological Reconnaissance Report_Part2
Appendix F Reconstruction Exhibits
Appendix G Cost Estimate and Construction Schedule
Appendix H Project Scope