North Peoria Area Drainage Master Plan - Flood Control District of ...

INTRODUCTIONRULES OF DEVELOPMENTCommunities develop drainage ordinances,policies, and standards with the intent to mitigate/minimizeflooding impacts due tourbanization of a watershed. The purpose ofthese regulations is to minimize the occurrenceof losses, hazards, and conditionsadversely affecting the public health, safety,and general welfare that might result fromflooding caused by the surface runoff of rainfall.Potential rainfall runoff relation impactsto a watershed due to urbanization are:• Decrease of stormwater infiltration capacitywithin a watershed due to urbanizationincreases peak discharge from awatershed unless measures are undertakento reduce post development peakdischarges.• An increase of peak discharge, frequency,and runoff volume due to urbanization ina watershed increases the potential forerosion and sedimentation within watercourses.• An increase in erosion potential can resultin loss of property and riparian habitat.• Due to an increase in peak discharge,existing drainage structures downstreamof newly urbanized areas will be undersized.• Increase in peak discharge increases theamount of property within a floodplain.Existing structures within or adjacent tothe predevelopment floodplain are at riskof a greater flood impact.• Disruption of natural flow paths can disruptthe natural system equilibrium andinduce bank erosion and long-term degradationof the channel bed.• An increase in bank erosion and long-termchannel bed degradation can result in theneed of grade control structures and bankstabilization.• Increased erosion and deposition willresult in greater costs for future structures,higher potential damage and likelihood offailure of existing structures, andincreased maintenance cost.• Increased deposition results in loss ofchannel capacity and increased flood levels.NORTH PEORIA AREA DRAINAGE MASTERPLAN ELEMENTSThe North Peoria ADMP is one of the manytools that have been developed to guidegrowth and development in the study area sothat impacts of urbanization on the environmentare minimized. The focus of the NorthPeoria ADMP is on flood and erosion controlmanagement; however, the plan takes intoconsideration the impacts of different floodcontrol management alternatives on environmental,cultural, and visual resources andlooks at multi-use opportunities. The intent ofthis plan is to work in conjunction with otherplanning documents and ordinances developedby the City of Peoria and MaricopaCounty. The plan is to be used by policy makersin the City of Peoria and Maricopa County,future residents, and developers when makingdecisions concerning development in thearea.Implementation of and guidance provided bythe plan is based on a set of managementgoals, objectives, and policies for each of thefour elements of the plan. The elements areEnvironmental Hazard Identification, Developmentand Planning Considerations, Environmental,and Multiple-Use Opportunities.The following definitions of goal, objective,and policy area are offered as a guide for theusers of the plan.21Goal:A statement that describes in generalterms a desired future condition.