FLOOD09627 - Laserfiche WebLink

Home Browse Search

Federal Emergency Management Agency ble. In addition, the following docu- mentation shall be submitted: (1) Copy of a pub!lc notice distribut_ ed by the community stating (,he com- munity's intent to revise the floodway or a statement by the community that it has notified all affected property owners and affected adjacent jurisdic- tions. (2) Copy,of a letter notifying the ap- propriate State agency of the flood, way revision when the State has juris~ diction over the floodway or its adop. tion by communities participating in the NFIP. (3) Documentation of the approval of the revised floodway by the appro- priate State agency (for communities where the State has jurisdiction over the floodway or its adoption by com- munities partfcipating in the NFIP). (4) Engineering analysis for the re- vised floodway. as described below: (i) The floodway analysis must be performed using the hydraulic com- puter model used to determine the proposed base flood elevations. (ii) The floodway limits must be set so that neither the effective base flood elevations nor the proposed base flood elevations if less than the effective base flood elevations, are increased by more than the amount specified under ~ 60.3 (d)(2). Copies of the input and output data from the original and modified computer models must be submitted. (5) Delineation of the revised flood. way on the same topographic map used for the delineation of the revised flood boundaries. (0) Data requirements for changes not asscciated with base /lood eleva- tion changes. The following data shall be submitted: (}) Items described in paragraphs (b) (1) through (3) of this section must be submitted. (2) Engineering analysis for the re- vised floodway, as described below: (i) The original hydraulic "omputer model used to develop the established base flood elevp.Uons must be modified to include all encroachments that have occurred in the flood plain since the existing floodway was developed. If the original hydraulic computer model Is not available, an alternate hy- draulic computer model may be used ~65.8 provided the alternate model has been calibrated so as to reproduce the origi- nal water surface profile of the origi- nal hydraulic computer"model. The a1. ternate model must be then modified to Include all encroachments that have occurred since the existing flood- way was developed. (ii) The floodway analysis must be performed with the modified comput- er model using the desired floodway limits., (lii) The floodway limits must be set so that combined effects of the past encroachments and the new floodway limits do not increase the effective base flood elevations by more than the amount speclfied In ~ 6003(d)(2). Copies of the input and output data from the original and modified com- puter models must be submitted. (3) Delineation of the revised flood- way on a copy of the effective NFIP map and a suitable topographic map. (d) Certification req'uirements. All analyses submitted shall be certified by a registered prof~ssional engineer. All topographic data shall be certified by a registered pr,ofessional engineer or !lcensed land surveyor. Certifica- tions are subject to the definition given at ~ 65.2 of this subchapter. (e) Submission procedures. All re- quests that involve changes to flood. ways shall be submitted to the appro. prlate FEMA Regional Office servicing the c'ommunity's geographic area. [51 FR 30315. Aug. 25, 19861 ~ 65.8 Review of proposed projects. A community, or individual through the community, wishing FEMA's com- ments on whether a proposed project, If built as proposed, would justify a map revision may request a Condition- al Letter of Map Amendment or Revi. sion in accordance with Part, 72 of this subchapter. The data required to sup- port such requests are the same as those required to support requests for revisions in accordance with U 65.5, 65.6, and 65.7, except as.built certifica- tion' is not required. [51 FR 30315. Aug. 25, 1986] 357