ON-CALL SERVICES FOR THE DEPTH AREA REDUCITON FACTOR STUDY RFQ

Agency: Maricopa County
State: Arizona
Level of Government: State & Local
Category:
  • Q - Medical Services
Opps ID: NBD15727248457544471
Posted Date: Jan 8, 2021
Due Date: Feb 2, 2021
Solicitation No: 2020C014
Source: Members Only
Issuing agency: Maricopa County, AZ
Issuing department: D690 - FLOOD CONTROL DISTRICT
Bid Comments:
SUBMISSION:
Vendor must submit through PeriscopeS2G only. Vendors must view or download all attached forms prior to submitting.
MOUNTAIN STANDARD TIME:
Times listed are for Mountain Standard Time.
EVALUATION AND AWARD:
Award is made at the sole discretion of the solicitation issuing Department.Â
COMMUNICATION:
All questions must be submitted through PeriscopeS2G ONLY by the date and time listed in the bid. Â

PRESUBMITTAL GO TO MEETING 2020C014 On-Call Services for Depth Area Reduciton Factor Study / Belinda Mcllhargey / jn

Wed, Jan 20, 2021 2:00 PM - 3:30 PM (MST)

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Description:
Engineers use rainfall depths developed by NOAA to complete studies that identify and evaluate flood hazards. These values are also used to design drainage facilities (culverts, basins, bridges, etc.). The rainfall depth is the depth that is expected to occur at a point or points in a study area, typically a watershed. However, this depth should not be used over the entire watershed because the rainfall will be overestimated. A depth-area reduction factor is used to convert the point rainfall to an equivalent uniform depth over the study area. This factor is used to account for the observation that average precipitation intensity decreases as the area of the storm increases.

The current Drainage Design Manual, Hydrology Volume includes reduction factors developed in 1974 for the 6-hr storm event and 1984 for the 24-hr storm event. Recent studies have been compared to gage data and other storm evidence, and have shown that updates are needed. In many cases the areal reduction should be increase, which would decrease the rainfall values used for a watershed. For instance, if a project includes a design of a culvert, this update could potentially decrease the required size of the culvert.
Delivery location:
Contract duration: 730 days
Contract renewal: 1 annual renewal
Prices good for: 30 days
Estimated Amount: $1.00
Regions: Arizona, Maricopa

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