Flood-control-basin park planned in Apache Junction, channel in San Tan Valley
Independent Newsmedia
Posted 6/29/20
Resolutions authorizing the design and construction of flood-mitigation facilities in Apache Junction and San Tan Valley will be considered Wednesday by the Pinal County Board of Supervisors sitting …
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Flood-control-basin park planned in Apache Junction, channel in San Tan Valley
Posted
What is a 100-year flood?
In the 1960s, the U.S. government decided to use the 1% annual exceedance probability flood as the basis for the National Flood Insurance Program.
The 1% AEP flood was thought to be a fair balance between protecting the public and overly stringent regulation.
Because the 1% AEP flood has a one-in-100 chance of being equaled or exceeded in any one year, and it has an average recurrence interval of 100 years, it often is referred to as the “100-year flood.”
What about 10-, 25-, 50-year floods?
Recurrence intervals and probabilities of occurrences for 10-, 25- and 50-year floods have an annual exceedance probability of 10%, 4% and 2% respectively.
Source: usgs.gov
Independent Newsmedia
Resolutions authorizing the design and construction of flood-mitigation facilities in Apache Junction and San Tan Valley will be considered Wednesday by the Pinal County Board of Supervisors sitting as the flood control district.
The Apache Junction site, designed to meet the recurrence interval of a 100-year flood, at the southeast corner of State Route 88 and Idaho Road, is to become a multi-use park facility, according to Pinal County documents.
The San Tan Valley project, to meet the recurrence interval of a 25-year flood, includes a culvert at Roberts and Thompson roads, with a channel south to Phillips and then east more than 1,000 feet, according to a flood control district map.
The projects are to be discussed and voted on at the July 1 public meeting and executive session for the Pinal County Flood Control District. The meeting starts at 9:30 a.m. in the Pinal County Administrative Complex’s Board of Supervisors Hearing Room, 135 N. Pinal St. in Florence.
In alignment with Centers for Disease Control and Prevention guidelines and Arizona Gov. Doug Ducey’s executive orders regarding COVID-19, the Pinal County Board hearing Room will be open for five public attendees and an overflow room may have up to 10 additional people. Everyone will be required to have their temperature checked before entering the building. Citizens are encouraged to wear masks, according to www.pinalcountyaz.gov.
A resolution to be considered by the board authorizes the design and construction of a flood-mitigation and multi-use detention basin facility from SR88 south to Scenic Street and between Idaho and Winchester roads.
“(T)his project will be planned and designed to meet the recurrence interval of the 100-year flood, determined by the data and methodology used by the project engineers, and this level of protection is specifically approved by this board,” the resolution states.
It includes the expenditure of $300,000 for the design of the project. The money have been budgeted in the current and future fiscal year to do project design using flood-control district funds, according to Pinal County records.
The project is to reduce the risk of flooding and sedimentation problems within a portion of the City of Apache Junction.
The district will need to contract for the design of the project and acquire real and personal property, provide for utility relocation and do all things necessary for the implementation of the project, according to the resolution.
“(T)he district intends to enter into an intergovernmental agreement with the City of Apache Junction in the future, to establish a multi-use park facility within the project area ... a Pinal County owned parcel,” it states.
The basin is to be constructed by the Pinal County Public Works Department and/or the City of Apache Junction when future funding becomes available. The detention basin facility and appurtenant drainage structures in the project area will be maintained by the flood control district or the City of Apache Junction, the resolution states.
San Tan Valley basin
Another resolution authorizes the $1.25 million design and construction of a flood-mitigation channel and basin facility at Roberts and Thompson roads in San Tan Valley.
“(T)his project will be planned and designed to meet the recurrence interval of the 25-year flood, determined by the data and methodology used by the project engineers, and this level of protection is specifically approved by this board,” the resolution states.
It includes the expenditure of $250,000 for the design and $1 million for construction, according to Pinal County records.
Funds have been budgeted in the current and future fiscal year to do the project design using flood0control district funds.
The project, which is to reduce the risk of flooding to properties within a portion of western San Tan Valley, is to be constructed by the flood control district when future funding becomes available, according to the resolution.
The channel and basin facility in the project area will be maintained by the district and a culvert will be maintained by the Pinal County Public Works Department after the project is completed, it states.
