ON-CALL SERVICES FOR THE DEPTH AREA REDUCITON FACTOR STUDY RFQ
|Level of Government:||State & Local|
|Posted Date:||Jan 8, 2021|
|Due Date:||Feb 2, 2021|
|Issuing agency:||Maricopa County, AZ|
|Issuing department:||D690 - FLOOD CONTROL DISTRICT|
Vendor must submit through PeriscopeS2G only. Vendors must view or download all attached forms prior to submitting.
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Times listed are for Mountain Standard Time.
EVALUATION AND AWARD:
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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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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.
|Contract duration:||730 days|
|Contract renewal:||1 annual renewal|
|Prices good for:||30 days|
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