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

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the North Peoria ADMP. Users of the NorthPeoria ADMP should consult with the appropriatejurisdiction concerning specific planningelements, design criteria, and standardsfor multiple-use recreational needs. Discussionconcerning opportunities and constraintsfor multiple-use recreation, identified as partof the North Peoria ADMP, is located in NorthPeoria ADMP, Technical Data Notebook,Attachment 5, Multi-Use OpportunitiesAssessment Report.Goal RR1 - Promote continuous trails and vistas ofscenic areas along accessible washes.Goal RR2 - Promote connectivity between possiblewash corridor trail systems and to development,area destinations, and other shared-use recreationalfacilities.Flood HazardsAccording to ARS 48-3609A and under theauthority outlined in ARS 48-3605A floodplaindelineations shall be conducted on allwatercourses with drainage areas more than¼ of a square mile or having a 100-year estimatedflow rate of more than 500 cfs. Floodplaindelineations shall be conducted inconformance with State Standard 2-96 guidelines,guidelines presented in MaricopaCounty Drainage Design Manual Volume II-Hydraulics and guidelines presented in theCity of Peoria Infrastructure DevelopmentGuidelines.Erosion HazardsGoal RR3 - Protect the integrity of washes whileproviding opportunities for recreation and theenjoyment of the natural environment and scenicareas.DESIGN GUIDELINESThe following design/planning guidelines arepresented to aid designers and planners intheir efforts. The guidelines are in part fromand in addition to guidelines and criteria presentedin Maricopa County Drainage DesignManual Volume II-Hydraulics, State Standardsdeveloped by the Arizona Departmentof Water Resources and the City of PeoriaInfrastructure Development Guidelines.8QQDPHG:DVK27([DPSOHRID6WUXFWXUDO%DQN3URWHFWLRQ0HDVXUH'HVLJQHGWR0LQLPL]H/DWHUDO&KDQQHO0LJUDWLRQIn addition to establishing 100-year floodplainlimits, erosion hazard zone delineations shallbe conducted on all watercourses with drainageareas more than ¼ of a square mile or havea 100-year estimated flow rate of more than500 cfs. Erosion hazard delineation shall beconducted at a minimum in conformance withState Standard for Watercourse System SedimentationBalance (State Standard 5-96)guidelines. Depending on the level of detailneeded, State Standard 5-96 presents three levelsof evaluation. Level I evaluation assumesthat the results of the evaluation will be moreconservative than results from a Level II or IIIevaluation. This assumption may be generallytrue, but may not be valid in areas of potentialchannel avulsion or lateral migration. Level IIand Level III evaluations are technically morerigorous and the results may or may not indicatereduced erosion hazard zones relative tothe results of a Level I evaluation. Caution
NORTH PEORIAAREA DRAINAGE MASTER PLANshould be used in interpreting and applyingthe results of a Level I evaluation. Watercoursescharacterized with wide geologicfloodplains, multiple or braided channels,highly erosive banks, poorly vegetated banks,and potential for channel avulsions should beevaluated at a higher level than Level I.Areas located within the recommended erosionhazard zones developed as part of theNorth Peoria ADMP may be subject toincreased risks to public safety that warrantspecific development restrictions. Given thelevel of detail used to develop the recommendederosion hazard zones the developer/landowner is given the option of completing amore detailed erosion hazard zone evaluation.A typical scope of work for such an analysis islisted below:• Sediment Yield Analysis• Sediment Gradation AnalysisSpecific tasks likely to be conducted with eachof these analyses are outlined below.Technical Analysis Work PlanTask 1 – Hydraulics AnalysisHydraulic Data – HEC-RAS Models. Hydraulicdata will be obtained from modeling preparedfor the effective FEMA Flood Insurance Studiesor new modeling prepared for this study.Specific tasks include the following:• Convert HEC-2 to HEC-RAS Format. Inaddition to simple translation of the fileformat from line-based HEC-2 input towindow-based HEC-RAS input, the inputfiles will be screened for consistent channelbank stationing, extraneous GR points,and ineffective flow areas.([DPSOHRI8QGHU'HVLJQHG6WUXFWXUDO%DQN3URWHFWLRQTypical Scope of Work for Detailed ErosionHazard AnalysisChannel stability, or the potential for lateralmigration, will be evaluated using the followingtypes of analyses:• Interpretation of Geologic Surfaces• Historical Analyses• Field Analyses• Geomorphic Analyses• Hydraulic and Empirical Analyses• Sediment Transport Modeling• Plot Cross Sections. Cross section plotsshowing existing condition 2-, 10-, and100-year water surface elevations will beprepared. If the future conditions flowrates change significantly from existingcondition flow rates, then water surfaceelevations and channel geometry will alsobe plotted for future conditions. Ineffectiveflow areas in cross sections will alsobe documented.• Prepare Plots of Hydraulic Data from HEC-RAS. Plots of top width, hydraulic depth,flow cross section area, maximum flowdepth, mean channel velocity, and otherdata, as needed, will be prepared. At minimum,data from the 100-year event willbe plotted. Additional plots for the 10-year event may be made to estimate conditionsfor the dominant discharge.• Define Channel Subreaches. Plots of HEC-RAS data will be used to define characteristichydraulic reaches based on uniformflow sections, erosion prone sections (narrowwidth, high velocity), choke sections28
Page 2 and 3: TABLE OF CONTENTSPreface ..........
Page 4: PREFACEAt the request of the City o
Page 8 and 9: LIST OF TABLESTable 1: Regional and
Page 10 and 11: INTRODUCTIONThe natural physical ch
Page 12 and 13: minimize the effect of urbanization
Page 14 and 15: Peoria General PlanThe Peoria Gener
Page 16 and 17: HYDRAULICS8QQDPHG:DVK%LJ6SULQJHydra
Page 18 and 19: FLOOD AND EROSION HAZARD ZONESWith
Page 20 and 21: ing them before they are destroyed
Page 22 and 23: PUBLIC INVOLVEMENTAn integral part
Page 24 and 25: hard pan, typically less than two f
Page 26 and 27: Economic CriterionThe evaluation of
Page 28 and 29: Table 4Summary of Evaluation Result
Page 30 and 31: INTRODUCTIONRULES OF DEVELOPMENTCom
Page 32 and 33: Objective EH1.3Identify erosion haz
Page 34 and 35: the purpose of watershed and waterc
Page 38 and 39: (short, constricted reaches), backw
Page 40 and 41: • Collect hydrologic data - peak
Page 42 and 43: • Basin Outlet (Culvert). The bas
Page 44 and 45: Low Impact Structural AlternativeFo
Page 46 and 47: ack at the natural channel bed. In
Page 48 and 49: stability, and to assure structure
Page 50 and 51: developed for the Estrella Roadway,
Page 52 and 53: gabion mattressA gabion mattress is
Page 54 and 55: Maricopa County, August 21, 1993, H
Page 70 and 71: 100-year W.S. ElevationBufferFEMA 1
Page 72 and 73: NORTH PEORIA AREA DRAINAGE MASTER P
Page 74: 100-year W.S. ElevationFEMA 100-yea

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

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