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

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minimize the effect of urbanization on stormwaterrunoff and conveyance while recognizingthe values of the community and theopportunity to protect the unique characteristicsof the region. A holistic approach insuresthat public’s safety and quality of life is maintained.Goals of the North Peoria ADMP are:• Identify flood and erosion hazards alongmajor watercourses.• Develop policies and strategies to protectresidents from flood and erosion hazards.• Preserve the natural flood control functionof the existing washes and channels.• Incorporate public and private interests,issues, and concerns.• Minimize future expenditures of publicfunds for flood control and emergencymanagement.• Consider environmental and landscapecharacteristics of the watershed in thedevelopment of watershed managementalternatives.• Minimize disturbance of existing floodplainand floodway ecosystem and habitats.• Consider multiple-use activities for floodplainareas.BACKGROUNDPROJECT AREAThe North Peoria ADMP study area encompassesapproximately 73 square miles withinunincorporated Maricopa County and theCity of Peoria. The study area is divided intofour planning areas based on physical characteristicsand/or geographic location of eachplanning area. The four planning areas are theMorgan City Area, Big Spring Area, East TerraceArea, and the Twin Buttes Area. TheHieroglyphic Mountains, located within theMorgan City Area, Big Spring Area, and thenorthern portion of the Twin Buttes Area arecharacterized by peak, ridge, wash, and valleylandforms. Terrain slopes within the HieroglyphicMountains range from less than 10percent to greater than 25 percent. Rock outcropand rock fragments typify soil constituentswithin the Hieroglyphic Mountains.Within the Morgan City Area and Big SpringArea, washes are typically incised in rock orwell-cemented alluvial material. The East Terracearea located east of the Agua Fria Riverand the southern portion of the Twin ButtesArea have landforms characterized with terrainslopes of less than 10 percent and areunderlain typically by alluvial material. Sinuousnatural channels that are cut into alluvialmaterial characterize washes in the East TerraceArea and in the southern portion of theTwin Buttes Area. With the exception of thelower reach of Morgan City Wash, washesdraining the study area watersheds areephemeral. Springs deliver water to the lowerreach of Morgan City Wash providing flowyear around. Figure 2 displays major watercoursesthat drain from the study area to theAgua Fria River, specific planning areas delineatedby unique physical characteristics, andphotographs of some of the physical characteristicof the area.One of the unique characteristics of the area isthe contrast in terrain from the planes and flatlands of the valley to the varied landforms ofthe Hieroglyphic Mountains. Figure 3, TerrainSlope Map, is a graphic representation ofterrain slope in the area. Terrain slope is oftenused by communities and agencies to definesignificant areas of preservation or areaswhere special development considerationsmust be met. Maricopa County encouragespreservation of, and applies development considerationsfor significant mountainous areaswith terrain slopes of greater than 15 percentwhere as the City of Peoria applies specialdevelopment considerations for areas withterrain slopes of greater than 10 percent.3
LAND OWNERSHIPNORTH PEORIAAREA DRAINAGE MASTER PLANThere are four primary entities with land ownershipin the area: the United States FederalGovernment, Arizona State Trust Lands, MaricopaCounty, and private interests. The percentof land owned by each entity is 35%Federal, 32% State Trust, less than 1% County,and 31% private. Figure 4 displays the distributionof land ownership in the study area.Currently the study area is predominatelyundeveloped, however to identify futuretrends in stormwater runoff and conveyance,the City of Peoria’s Land Use Plan developedas part of the city’s General Plan is utilized inthe development of the North Peoria ADMP.Figure 5, Future Conditions Constraints;depicts land use designations, floodplains,and areas of impending development in thestudy area.LAND USEPlanning documents developed by communitieshave a land use element that provides aframework for defining future developmentpatterns. The Land Use element helps guidefuture growth, revitalization and preservationefforts in the community. An understandingof future or anticipated land use is key to thedevelopment of an area drainage master plan.Urbanization of an area typically alters existingrainfall runoff relationships that ultimatelycould result in flooding impacts to thecommunity.REGIONAL AND LOCAL PLANNING EFFORTSThere are a number of planning documentsthat have been developed by county and cityagencies to provide direction and guidance inregards to development and future land usewithin the North Peoria ADMP study area.Planning documents reviewed as part of thedata collection are listed in Table 1. A briefsummary of the purpose of the document andrelevance to the North Peoria ADMP is providedin the following sections.Table 1Regional and Local Planning DocumentsAgencyCity of PeoriaDocumentGeneral PlanLake Pleasant/North Peoria Area PlanPeoria Desert Lands Conservation MasterPlanRiver Master PlanTrails Master PlanFlood Control District of Maricopa CountyMaricopa CountyAgua Fria Watercourse Master PlanComprehensive Plan-Maricopa CountyEye To The Future, 2020White Tank/Grand Avenue Area SpecificPlanMaricopa County Association ofGovernmentsDesert SpacesDesert Spaces-Environmentally SensitiveDevelopment Areas4
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 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 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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