1997-06-05_REVISION - M1981302 - Laserfiche WebLink

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Memo to File M-81-302 -9- June 5 . 1997 exclusion of the land inside the levee from the floodplain has been called into question due to the fact that the levee has not been certified by FEMA, and Federal Insurance Administration regulations provide for mapping areas behind levees as protected from the one percent annual chance flood only if the levee system has been certified. It is the Division' s understanding that the landowner of the Deepe Farm Pit, which is now the University of Colorado, intends to have the levee certified by FEMA. once the levee is certified, the land grades behind the levee can be considered to have no influence on one percent annual chance flood flows. If the levee were to be removed, or were to fail during a flood, it is appropriate to analyze the effect of the proposed modified land grades that are a component of the amendment AM-0.02 application as opposed to the currently approved land grades within the levee as depicted on the 1989 amendment AM-001 map and on the 1991 technical revision TR-004 map. The 1989/1991 approved land grades within the perimeter levee include a chain of 4 ground water and ditch fed ponds with spillways and connecting channels . Since the ponds in the approved plan are designed to spill one into the next, and ultimately drain off-site to the north, no flood water storage may be relied upon from the approved land grade and pond configuration, so approving a different land grade and pond configuration could not adversely affect the flood storage potential of a reclaimed Deepe Farm Pit . Current Floodolain Study Quotes pertinent to the City of Boulder' s concerns in this regard, from the letter dated 4/22/97 : . . . the City of Boulder asks the DMG to refrain from approval of Western Mobile' s proposed reclamation plan amendment for the Deepe Farm Pit until the Taggart study is complete and Western Mobile has had an opportunity (to) incorporate the results of the master planning effort into its final reclamation plan. In accordance with section 34-32 . 5-115, the Division must make a decision on an application for an amendment within a specifically defined time frame. The Division has no authority to delay the decision on the Deepe Farm Pit amendment application to await the results of the Taggart study. Conclusion 10 The Division' s decision to recommend approval of the pending amendment to the Deepe Farm Pit permit over the objections of the City of Boulder, is appropriate. C:\NP51\DEEPEPITJl