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3.3City of Roseville One of the primary means for the City to manage surface water is through this plan which is legally enforceable through city ordinances and standards such as Shoreland, Wetland, StormwaterManagement and Floodplain Regulations. City code chapters and sections relevant to surface water management have been included in Appendix C. In addition to City ordinances, Roseville enforces stormwater design standards through development review, building permits and erosion control permits. For example, currently, all sites that are greater than 5,000 square feet or land adjacent to a water resource are required to get an Erosion Control Permit.Further detail regarding design standards can be found in Appendix B. Stormwater Management Standards can be updated as needed to keep up with state of the science, code/ordinance updates, and watershed regulations. Enforcement of the City’s ordinances and standards goes hand-in-hand with compliance with local, state, and federal regulations. Closely related to surface water management is the NPDES MS4 permit program. As of March 2003, all cities in the Twin Cities metropolitan area are permittees under the NPDESPhase II MS4 Stormwater permit and must therefore meet certain requirements related to stormwaterpollution control. The six minimum control measures and associated BMPsofthe NPDES MS4 program are included in the City’s Stormwater Pollution Prevention Plan(SWPPP)found in Appendix D. 4.0Goals and Policies To support a high quality of life for the City’s residents,protect the City’swater resources, and promote sustainability and resiliency,the City has developed the following goals and policies.Agoal is the specific end point which is desired and policies are guiding principles which altogether form a strategy to attain the goals. Plan standards (or stormwater development criteria) are an extension of the goals and policies that provide detailed criteria onstormwatermanagementpractices.This section of the CSWMP outlines goals and policies related specifically to surface water management in the City of Roseville. 4.1Flood Protection and Runoff Management Development and the related changes in land use can increase runoff rates and volumes due to additional impervious surface. As areas develop or redevelop at a higher density, stormwaterrunoff generally increases. In addition, and as discussed briefly in Section 2.1, changes in the characteristics of rainfall events are trending toward more intense rainfall and greater depth stormsand the NWS is in the process of updating precipitation frequency estimates. Whatever the cause of more intense and greater depth storms, this increase in runoff rates and volumes can result inlocalized and/or large scale flooding issues in the downstream system. It is important to manage these increased runoff rates and volumes in order to strive to reduce flooding in the downstream system and to control the potential effects of erosive flows on streams and waterways. As an established community with a developedenvironment, Roseville has dealt with and continues to deal with numerous flooding issues as a result of development altering the natural hydrology and infiltration characteristics of the land. These resolved and ongoing issues are further elaborated upon in Section 5.0. The City of Roseville has policies and standards that require volume reduction and rate control for new and redevelopment projects. The City has also adopted a floodplain ordinance, and has adopted policies that regulate minimum building elevations that comply with Minnesota DNR recommendations for a 1’ minimum freeboard between a structures