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

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PUBLIC INVOLVEMENTAn integral part of the preparation of theNorth Peoria ADMP was public and communityparticipation. Ninety-eight percent of theproperty in the study area is held by federal,state and private interest with the majority ofthe private interest (approximately 31% of thearea) held by a few individuals or partnershipsthat are planning on developing theirproperty. Typically, private lands are undevelopedand owners are absentee owners. Thenature and distribution of land ownershipdoes not lend itself to a typical public involvementprocess of conducting a series of publicinformation meetings. A public outreach programconsisting of questionnaires, newsletters,individual meetings with landownersand federal, state and local agencies and apublic meeting was initiated to obtain publicand community participation.3XEOLF:RUNVKRSLandowners in the area were notified of thedevelopment, goals, and progress of the planthrough individual mailings of newsletters,questionnaires, and public announcements inlocal newspapers. A public workshop washeld to present data collection results, policydevelopment, alternative stormwater managementapproaches developed for the plan andto obtain comments and suggestions from participants.Throughout the term of the project, individualmeetings were held with engineers and/orplanners representing the interests of ongoingdevelopment projects. Development projectswithin the plan area include Lake PleasantVistas, Saddleback Heights, White PeaksRanch, Lake Pleasant Heights, Lakeland Village,Upco, and the groundwater rechargeproject conducted by the Central ArizonaProject.FLOOD CONTROL MANAGEMENTALTERNATIVES DEVELOPMENT ANDEVALUATIONThe North Peoria ADMP provides a regionalapproach to flood control management.Development of flood control managementalternatives and policies that forms the foundationof the plan takes into account engineering,environmental, landscape, social andeconomic considerations. Watershed managementalternatives are developed to mitigate/minimize the effect of urbanization on stormwaterrunoff and conveyance while recognizingthe values of the community and theopportunity to protect the unique characteristicsof the region. Flood control managementalternatives are evaluated on how well eachalternative meets the goals of the North PeoriaADMP. The primary purpose for flood controlmanagement alternative development andevaluation is to develop a range of plans thatprovides public safety from flood and erosionhazards, determine the cost and benefits ofeach alternative, qualitatively determineimpacts of the alternative on identified environmentalresources and to select a preferredmanagement plan.FLOOD CONTROL MANAGEMENTALTERNATIVESFlood control management alternatives developedand evaluated for the North PeoriaADMP are categorized into two groups:watercourse management. Alternatives andstormwater storage alternatives. Watercoursemanagement alternatives evaluated includeda non-structural, a partial structural, a low13
NORTH PEORIAAREA DRAINAGE MASTER PLANimpact structural, a full structural, and a noaction. The full structural alternative is basedon current federal, state, and local floodplainmanagement regulations that allow encroachmentinto the floodway fringe. The full structuralalternative typically requires, at aminimum, the structural stabilization of washside slopes for the entire reach. The partialstructural alternative also is based on currentfloodplain management regulations, howeverthe partial structural solution is applied atonly specific locations along the watercourse.The low impact structural alternative allowsfor development activity to occur within theerosion hazard zone as long as the activitydoes not significantly alter the natural formand function of the watercourse. The nonstructuralalternative defines a corridor thatallows the watercourse to function naturally.The no action (do nothing) alternative providesflood control management based on currentfederal, state and local floodplainmanagement regulations that allowsencroachment into the floodway fringe. Typically,under current regulations encroachmentsinto the floodway fringe are allowed ona piece-meal fashion without taking into considerationthe effect of the encroachment orcollective encroachments on the entire watercourse.Typical sections of watercourse-basedalternatives are depicted in Figure 16, Figure17, Figure 18, and Figure 19. Stormwater storagealternatives evaluated include the standardpractice of retaining the volume of flowfrom the 100-year, 2-hour event, in-stream, inlinedetention alternative and an in-stream,off-line retention alternative. Perspectives ofthe in-line detention alternative and the offlineretention alternative are presented as Figure20 and Figure 21.14The evaluation/application of an alternativefor a given watercourse is based on physicaland data constraints. Physical constraintsinclude land use, topography, the location,and distribution of rock outcrop, and characteristicsof the floodplain (i.e. floodway limitscoincidental with floodplain limits). Data constraintsare the availability of hydraulic models.Hydraulic evaluations of watercoursebasedalternatives are developed for watercoursesin which detail hydraulic models weredeveloped as part of the study or availablefrom previous studies. The full structuralalternative is applied only to watercourses inthe Twin Buttes area below the CAP canal.The partial structural alternative is evaluatedfor the three unnamed washes that drain theBig Spring Area to the Agua Fria River. Thelow impact structural alternative is evaluatedfor all watercourses in which erosion hazardzones have been delineated as part of thisstudy. The non-structural alternative and theno action alternative are evaluated for allwatercourses in which hydraulic models wereavailable.Both Maricopa County and the City of Peoriarequire retention/detention (stormwater storagefacilities) for all new developments. Thegoal of this requirement is to reduce/minimizethe impacts of the increased runoff dueto development in the watershed. Ideally, thisis accomplished by controlling the post-developmentrunoff such that it is equivalent inmagnitude, duration, and temporal distributionto the pre-development conditions. Toachieve this goal, both Maricopa County andthe City of Peoria use the 100-year, 2-hourstorm as the design event for sizing retention/detention facilities.Traditionally, retention has been accomplishedby storing the 100-year, 2-hour runoff volumein below grade basins. These basins typicallyare drained by percolation into the soil and/ora small outlet structure connected to a watercourseoften via an extensive storm drain system.The effectiveness of this type of facility,both economically and hydraulically, is afunction of the soil and terrain characteristics.Shallow soils with low permeability ratesand/or soils that occur on steep slopes are notconducive to this particular application.Fifty percent of the North Peoria ADMPproject area have soils types that are characterizedby moderate to moderately slow permeability;low to very low available watercapacity and shallow depth to bed rock or
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 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 36 and 37: the North Peoria ADMP. Users of the
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
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North Peoria Area Drainage Master Plan - Flood Control District of ...

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