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IV. Overview Of State Standards

A.SS1-97: Requirement for Flood Study Technical

Documentation

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IV. Overview Of State Standards

A.SS1-97: Requirement for Flood Study Technical

Documentation Sets technical documentation standards

for Flood Studies that are to be submitted to ADWR or FEMA.

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IV. Overview Of State Standards

A.SS1-97:B.SS2-96:

Requirement for Floodplain and Floodway Delineation in Riverine Environments

Provides methodologies for estimating 100-year peak discharges, delineating 100-year floodplain limits, and determining administrative floodway boundaries for riverine floodplains in Arizona.

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IV. Overview Of State Standards

A.SS1-97:B.SS2-96:C.SS3-94:

State Standard for Supercritical Flow (Floodway Modeling)

Provides guidelines to be used when modeling floodways for supercritical or near-critical flow conditions in Arizona.

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IV. Overview Of State Standards

A.SS1-97:B.SS2-96:C.SS3-94:D.SS4-95:

State Standard for Identification of and Development within Sheet Flow Areas

Details minimum floodplain management standards for identification of and development within sheet flooding areas in Arizona.

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IV. Overview Of State Standards

E. SS5-96: State Standard for Watercourse System

Sediment Balance Provides guidelines for identification of and

development within erosion hazard areas, watercourses with a net sediment deficit, and watercourses with a net sediment surplus. Individual guidelines for: Lateral Migration Setback Allowance, Channel Degradation Estimation, and River Stability Impacts associated with Sand and Gravel Mining.

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IV. Overview Of State Standards

E. SS5-96:F. SS6-96:

State Standard for Development of Individual Residential Lots within Floodprone Areas

Provides Site Plan Checklist, Typical Plan, and Cross-Section requirements for individual residential lots within floodprone areas.

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IV. Overview Of State Standards

E. SS5-96:F. SS6-96:G.SS7-98:

State Standard for Watercourse Bank Stabilization

Provides minimum design standards for several bank stabilization techniques.

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IV. Overview Of State Standards

E. SS5-96:F. SS6-96:G.SS7-98:H.SS8-99:

State Standard for Stormwater Detention/Retention

Provides minimum criteria for sizing Detention and/or Retention facilities.

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IV. Overview Of State Standards

E. SS5-96:F. SS6-96:G.SS7-98:H.SS8-99: I. SS9-02:

State Standard for Requirements for Floodplain Modeling

Provides guidance in mathematical modeling of hydraulic processes in watercourses and floodplains.

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click on publications link

IV. Overview Of State Standards

All State Standards are accessible in PDF format on ADWR website (www.water.az.gov) and on the FITD Class CD.

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IV. Overview Of State Standards

J. State Standards – Three Level Approach1. Level 1

2. Level 2

3. Level 3

4. Limits of Applicability

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IV. Overview Of State Standards

J. State Standards – Three Level Approach1. Level 1

the minimum level of regulation acceptable. intended for use where only limited site and flood data

are available, and where site improvements are minimal. requires the lowest level of effort to apply. generally the most conservative. requires the lowest investment (labor and cost).

Example:Isolated single family residence along unmapped floodplain in rural area.

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IV. Overview Of State Standards

J. State Standards – Three Level Approach2. Level 2

requires a basic understanding of hydrologic principles. and mathematics.

appropriate for single lot developments where some site and flood data are available. generally less conservative than Level 1. may or may not be more conservative than Level 3

Example:Single family residence in unmapped floodplain in suburban or rural area, site survey available.

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IV. Overview Of State Standards

J. State Standards – Three Level Approach3. Level 3

involves detailed engineering analyses. intended for use on larger developments or where

regional floodplain management issues are impacted. requires the highest investment of labor and cost analyses are most appropriate for generating

hydrographs, evaluating watershed response to changes, and modeling complex watersheds.

Example:New subdivision within unmapped floodplain.

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IV. Overview Of State Standards

J. State Standards – Three Level Approach4. Limits of Applicability

State Standards shall be applied within the State of Arizona for:

Areas with a watershed larger than 1/4 square mile (0.25mi2), or

Areas with a 100-year peak discharge > 500 cfs, Areas with significant flood hazards identified by a local

floodplain administrator

(CONTINUED)

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IV. Overview Of State Standards

J. State Standards – Three Level Approach4. Limits of Applicability (CONTINUED)

State Standards shall NOT be applied within the State of Arizona for:

Floodplain areas that have been mapped as part of a detailed Flood Insurance Study by FEMA or a local floodplain management agency. A detailed study has, at minimum, base flood elevations and floodplain limits.

Areas covered by more stringent local ordinance, as determined by the Director of ADWR

NOTE: Other limitations and restrictions are described with the text of each adopted State Standard.