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FLOOD00802
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Last modified
11/23/2009 1:21:28 PM
Creation date
10/4/2006 9:28:55 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
355
County
Weld
Community
Greeley
Stream Name
Cache La Poudre
Title
Floodplain and Floodway Analysis
Date
1/1/1994
Designation Date
3/1/1994
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />6 <br /> <br />3. Aeration Basins. The aeration basins are located on the same high ground as the <br />primary clarifiers. They are located outside of the floodway and therefore, can <br />be modified as necessary. <br /> <br />4. Secondary Clarifiers. The secondary clarifiers are located within the floodplain. <br />Additionally, the southern portion of the complex is located within the floodway. <br />Any additions to the secondary clarifier complex must be constructed to the north <br />of the existing clarifiers outside of the floodway, but must be floodproofed. <br /> <br />5. Blower Building. The blower building is located within the regulatory floodway. <br />The building itself, however, is on raised ground above the lOa-year floodplain <br />elevation. Modifications to the blower building must be confined within the <br />existing building footprint. <br /> <br />6. Chlorine Facilities. The chlorine facilities are located within the regulatory <br />floodway. Again, the building is constructed on raised ground above the <br />floodplain. Facility improvements should be confined to within the existing <br />building. The possibility exists that the building could be expanded to the north <br />outside of the floodway. This will need to be carefully analyzed after FEMA <br />addresses the request for a LOMR <br /> <br />7. Sludge Digester Complex. Most of the sludge digester complex is located within <br />the floodway and it is entirely within the J1.oodplain. Floodway regulations may <br />limit construction within this complex. <br /> <br />CONCLUSION <br /> <br />The City of Greeley's Water Pollution Control Facility (WPCF) is presently totally <br />contained within the regulatory floodway of the Cache La Poudre (Poudre) River. Regulatory <br />compliance dictates that no expansions can be made to the plant that could adversely impact the <br />floodway. Since the date of floodway delineation by the Federal Emergency Management <br />Agency (FEMA), considerable changes have been made which impact the floodway. Most <br />notably are the construction of replacement bridges crossing the Poudre at Ash A venue and at <br />8th Street. These bridges cause a reduction in the J1.oodway and lowerthe 25-,50- and lOa-year <br />water surface profIles. The magnitude of the changes justifies an application for a Letter of Map <br />Revision (LOMR) to redefme the regulatory floodplain and floodway. <br /> <br />The accompanying documentation provides a basis for requesting a LOMR This would <br />remove large areas ofthe WPCF from the floodway. Additionally, the lowered lOa-year flood <br />profile would place plant components that are on naturally high ground out of the floodplain. <br />The resultant regulatory boundaries would permit most of the contemplated plant modifications <br />to be constructed without violating floodway ordinances. <br /> <br />'lmwl1 ami Call1'well <br />,~~--:I' ,c;" i! ,1 ~ Its <br /> <br />21/7387 <br />
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