Lower Santa Cruz River Living River Project
5/15/2013
The Lower Santa Cruz River Living River Project is an effort by the District to evaluate the effect of effluent discharge from two major wastewater treatment plants on the wetlands of the Lower Santa Cruz River.
New brochure: How do I remove my home or property from a FEMA mapped floodplain?
4/25/2013
The District has created a fact sheet on obtaining letters of map amendment or map revision from the Federal Emergency Management Agency (FEMA) titled How do I remove my home or property from a FEMA mapped floodplain? (PDF format). The brochure explains the steps and information necessary to revise a FEMA mapped floodplain.
1936 and 1941 historical aerial photos now available
4/3/2013
1936 and 1941 historical aerial photos are now available for public access. Viewing the spatial index grid for the photos requires Autodesk MapGuide, which is available for free download.
Pegler Wash Floodplain Mapping
1/14/2013
The District has completed a floodplain mapping study for Pegler Wash.
Unnamed 12 Wash Floodplain Mapping
1/14/2013
The District has completed a floodplain mapping study for Unnamed 12 Wash.
Draft Administrative Completeness and Substantive Review Checklists
1/7/2013
12/31/2012 Draft Administrative Completeness and Substantive Review Checklists for Floodplain Use Permits (PDF Format). These checklists are provided to comply with A.R.S. § 48-3645 and once finalized, will be incorporated into Technical Procedure 109.
New Technical Policy: Tech-102 Site Plan Requirements for Permitting
12/31/2012
The Chief Engineer has approved a technical policy regarding Site Plan Requirements for Permitting (PDF format) to assist customers in providing the District with sufficient information to permit proposed improvements.
Manning's Rating Software added
11/21/2012
The District has developed a Microsoft Excel spreadsheet to determine flow parameters for Manning's cross-sections. This spreadsheet can be downloaded from the
Software page.
Arroyo Chico Pre- and Post-Project Floodplain Map added
11/20/2012
A new Pre- and Post-Project Floodplain Map has been added to the Arroyo Chico Project Maps Page.
Technical Policies 018 and 019 Updated
11/20/2012
Technical Policy 018 and Technical Policy 019 have been revised and are available on the Directory of Documents Page.
Via Entrada Wash Floodplain Letter of Map Revision Technical Data Notebook
10/25/2012
The Via Entrada Wash Floodplain Letter of Map Revision Technical Data Notebook became effective on September 28, 2012. For more information see the Via Entrada Wash Letter of Map Revision Technical Data Notebook, (Large file: 14 MB PDF format).
Finger Rock Wash Floodplain Re-mapping and Physical Map Revision
10/5/2012
The Finger Rock Wash Physical Map Revision became effective on January 25, 2012. The Finger Rock Wash Letter of Map Revision Technical Data Notebook, (Large file: 50 MB PDF format) is now available..
Black Wash floodplain Re-mapping and LOMR
8/13/2012
The Black Wash floodplain Re-mapping and LOMR has been approved by FEMA and is effective as of October 12, 2012.
District compliance with SB 1598 and A.R.S. § 48-3646, the Regulatory Bill of Rights
8/9/2012
In the District's ongoing efforts to comply with A.R.S. § 48-3646, also known as the Regulatory Bill of Rights, the District has modified the language of the Floodplain Use Permit (FPUP) Application. If you have saved a copy of the old FPUP application, please delete it and use the current version dated 8/8/2012. Please review the A.R.S. § 48-3646 Floodplain Use Permit Application Process Notice to learn more about A.R.S. § 48-3646 and District compliance with A.R.S. § 48-3646.
New Technical Policy: Tech-028 Pre-Ordinance Agricultural Berms, Channels and Stock Ponds
5/18/2012
The Chief Engineer has approved a technical policy on Pre-Ordinance Agricultural Berms, Channels and Stock Ponds (PDF format) to provide guidance in permitting improvements that may be adversely impacted by old agricultural features.
Policy on Increasing Pier Widths for Debris Loading in Hydraulic Models
4/12/2012
The Chief Engineer has established a policy on Increasing Pier Widths for Debris Loading in Hydraulic Models (PDF format). Engineers should review and abide by this policy when doing hydraulic modeling that includes bridge piers.
Finger Rock Wash Floodplain Re-mapping and Letter of Map Revision
2/6/2012
FEMA has approved a Letter of Map Revision (LOMR) for Finger Rock Wash. The LOMR became effective January 25, 2012. For more information on the floodplain re-mapping and the appeal period, see the Finger Rock Wash Floodplain Re-Mapping Page.
Technical Procedure 113 for Elevation Certificates modified
2/2/2012
The Technical Procedure 113 (PDF format) for Elevation Certificates has been modified to address some changes in establishing the BFE in Box B9.
New Low Impact Development (LID) Working Group webpage
2/2/2012
A new webpage has been created for the Low Impact Development (LID) Working Group. The goal of LID Working Group is to review existing LID practices being used and develop a LID Manual for use in Unincorporated Pima County. This page is primarily designed to distribute LID and Green Infrasatructure (GI) information to the working group, but is full of great information of interest to anyone interested in LID and GI.
Base Flood Elevation Calculation Spreadsheet
1/24/2012
The District has developed for public use a Base Flood Elevation Calculation Spreadsheet (Microsoft Excel format, right-click and choose "Save as" option to download) - Use this spreadsheet to calculate the Base Flood Elevation (BFE) and Regulatory Flood Elevation (RFE). Please see Technical Procedure 101 for more information about calculating the BFE.
Establishing a local datum for Elevation Certificates within Zone A Special Flood Hazard Areas and sheetflow floodplains
12/20/2011
The District is currently requesting surveyors and engineers completing Elevation Certificates to establish a local datum of 100.0 feet at Highest Adjacent Natural Grade (HANG) for FEMA A Zones and local sheetflow floodplains. The District will indicate the BFE in box B.9 of the Elevation Certificate as 101.0 (for example) and indicate that the datum is HANG = 100.0 ft. Please see the December 20, 2011 memo to surveyors and engineers (PDF format) for more information.
Casas Adobes Wash Floodplain Re-mapping
12/9/2011
The District has completed a floodplain mapping study for Casas Adobes Wash.
Campbell Wash Floodplain Re-mapping and Letter of Map Revision
12/9/2011
The District has completed a floodplain mapping study for Campbell Wash. For more information on the floodplain re-mapping and the appeal period, see the Campbell Wash Floodplain Re-Mapping Page.
Nanini Wash Floodplain Re-mapping
12/9/2011
The District has completed a floodplain mapping study for Nanini Wash.
Technical Policy 020 on Erosion Hazard Setback Reduction
11/28/2011
The District has updated a longstanding policy regarding engineering analyses for erosion hazards. The former handout is now Technical Policy 020 (PDF format), effective 11/16/2011. The policy details the requirements for engineering analyses submitted to the District to reduce or mitigate erosion hazards for structures.
Technical Policy 025 - Sand & Gravel Permitting Guidelines
11/10/11
Technical Policy 025 for Sand & Gravel Permitting (PDF format) has been approved and is effective as of 11/07/2011. This policy is designed to clarify the Ordinance and assist Sand & Gravel operations in understanding the permit requirements for operation.
Memo regarding joint U.S. Army Corps of Engineers and Flood Control District projects
11/9/2011
County Administrator Chuck Huckelberry recently sent a memorandum on U.S. Army Corps of Engineers and Regional Flood Control District Projects (7 MB PDF format) within Pima County to the Board of Supervisors.
Onsite and Offsite Riparian Habitat Mitigation Guidelnes submitted to Board of Supervisors
11/3/2011
The final version of the Onsite and Offsite Mitigation Guidelines have been placed on the November 15, 2011 Board Meeting Agenda for consideration:
Pima County Board of Supervisors Package for the Onsite and Offsite Mitigation Guidelines (42 MB PDF file)
Offsite Mitigation Guidelines ILF Calculation Spreadsheet (Microsoft Excel format)
District compliance with SB 1598 and A.R.S. § 48-3646, the Regulatory Bill of Rights
9/12/11
Due to the passage of SB 1598, also known as the Regulatory Bill of Rights, by the Arizona legislature, Floodplain Use Permits are subject to A.R.S. § 48-3646. Please review the A.R.S. § 48-3646 Floodplain Use Permit Application Process Notice to learn more about A.R.S. § 48-3646 and District compliance with A.R.S. § 48-3646.
Green Valley Drainageway #6 improvements are coming soon
7/22/2011
The District will soon be doing maintenance work on Green Valley Drainageway #6. Work is scheduled to begin in the fall of 2011. Please go to the Green Valley Drainageway #6 web page for more information.
FEMA has updated its Flood Insurance Rate Maps (DFIRMs) for all of Pima County
6/16/2011
On June 16, 2011, FEMA issued revised its county-wide digital Flood Insurance Rate Maps (DFIRMs). The revised FIRMs are effective as of that date. It is important for all property owners in Pima County to determine how the new DFIRMs will affect them. There are many properties within Pima County that are subject to floodplain revisions and it is important to understand the ramifications of those revisions. Please visit the L Series DFIRM page for more information.
Floodplain Studies for Four Watercourses Completed, Property Owners Notified
5/13/11
The District recently updated its floodplain maps for Castle Rock Wash (PDF 12 MB), Scott's Knob Wash (PDF 7 MB), Wentworth Wash (PDF 13 MB) and Old Grandad Tank Wash (PDF 20 MB) and is sending letters to property owners affected by the updates. Please view the overview map (PDF) to see the locations of the washes. Aerial photographs helped hydrologists identify which properties and structures are located within the floodplains of these washes. Flood insurance isn’t mandatory in floodplains like these since they are not under the jurisdiction of the Federal Emergency Management Agency, which also maps floodplains. The letters suggest property owners should look into buying flood insurance to protect their investment, even though the insurance is not mandated.
HEC-HMS Model paramaterization spreadsheets
4/25/11
The District has developed a number of spreadsheets to assist in model parameterization of HEC-HMS models. These spreadsheets are now available on the Software page.
Technical Policy 027 - Protective Measures for Private Vehicular Access
4/19/11
Technical Policy 027 for Protective Measures for Private Vehicular Access (PDF format, 4 MB) has been approved and is effective as of 4/14/11. This policy covers unimproved at-grade wash crossings, improved at-grade wash crossings, and improved culverted wash crossings.
Low Impact Design/Green Infrastructure (LID/GI) Web Page
4/19/11
A web page has been created to share the District's efforts in promoting Low Impact Design/Green Infrastructure (LID/GI). In addition to information about LID/GI, the presentations from a recent LID/GI Workshop sponsored by the District is available through the LID/GI web page.
