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I I I I I I I I I I I I I I I I I I I ~ Massey Draw and SJCD Update Project Meeting Minutes July 8, 2004 Page 2 of 2 OLSSON ASSOCIATES was discussed during today's meeting, and it was to modify the area to function as it was shown in the LOMR. This alternative essentially blocks water from flowing north of Rockland Drive and diverts it all south of the homes. Different options for return flow, with and without buying homes, should be considered. 4, Bill would like to see the modeled effects of what would happen if the entire 100-year discharge flowed south of Rockland Drive. 5, Garrison Street overtopped during the June 27, 2004 storm event and needs improvement. ENG INE ERS' !'LANNERS' SCIE IIITI5T5. SURVEYORS 143 Union Blvd. Suite 700 Lakewood, CO 80228720.962-6072 MEETING MINUTES Massey Draw and SJCD (South) Update - Special Meeting OA Project No. 02-2003-1321 July 8, 2004 6. Ben asked OA to prepare a proposal to survey the culverts under Oak Street and Rockland Drive. and the wood pedestrian bridge that crosses the wetlands located south of Rockland Drive, He asked that evaluation of the alternatives discussed in item 3, and creation of a parallel hydrology model that includes the golf course ponds and potentially the flow from north of the golf course be included in the proposal. 7. If the golf course has not been provided progress meeting minutes, they should be included in future distributions. Attendees: Bill DeGroot - Urban Drainage and Flood Control District (UDFCD) Paula Lundquist - Jefferson County Kevin Stewart - Urban Drainage and Flood Control District Ben Urbonas - Urban Drainage and Flood Control District Bruce Buttner - Olsson Associates (OA) David Krickbaum - Olsson Associates Deb Ohlinger - Olsson Associates Items Distributed: An aerial map of areas observed to be inundated by the June 27, 2004 storm, a copy of a portion of the LOMR submittal that shows part of the golf course, and an electronic copy of additional mapping were provided to OA by UDFCD, cc: Attendees via e-mail Discussion Items: 1. This meeting was held to discuss the flooding that occurred along Massey Draw on June 27, 2004. 2. General observations made by UDFCD, Jefferson County, and OA included the following: . Approximately 900-1000 cfs (preliminary estimates) entered the golf course at the northwest entry point. . Approximately 75% of the flow went north at the split west of the golf course clubhouse, . Water was flowing over the road north of the golf course and west of the clubhouse 3-5 feet deep and was flowing onto the golf course. . The August 1999 storm appears to have been larger than the June 27, 2004 storm, 3. Bill had met with representatives of the homeowners. They inquired as to whether the following two alternatives to mitigate the flooding had been evaluated. The first alternative was an upstream dam. The second alternative would entail diverting discharges from west of the hogback to the southerly side of C-470 and bringing the flow back under C-470 onto the golf course farther downstream. A third alternative