03-10-08 Drainage and Flooding Committee Meeting minutes

Browse Search

3. Drainage Improvements along Driftwood Drive - The initial solution included the installation of additional 36" and 60" outfall from Driftwood to the detention basin. The consultant has concluded that this proposal may not produce the desired reduction in ponding along Driftwood. Klotz recommended the construction of curb cuts and overland sheet flow paths be constructed from Driftwood into the outfall ditch (west side of Driftwood) and from Driftwood into the detention pond (east side of Driftwood) to help the street drain faster during major rainfall events. Additionally, Klotz is examining the desirability of an interconnect of the two existing outfalls from the detention pond to the outfall ditch. Works completed to date includes beginning the construction of both sheet flow structures. As of the date of this report, the east outfall is 75% complete and the west outfall is 25% complete. Klotz has not yet determined the feasibility of the interconnect. Additionally, Klotz is examining the feasibility of constructing an additional storm sewer from the Mesquite intersection with Driftwood to the outfall ditch. 4. Fleetwood Drive Outfall Pipe Upsizing - The initial proposal to enlarge and/or add additional underground outfall at the end of Fleetwood Drive at Mesquite has been tabled until additional analysis is perform by Klotz. It appears that a more effective solution would be to provide for an emergency flow path be constructed between the existing houses at this location to the outfall ditch. Additional analysis is underway by Klotz to examine as-built construction plans to determine other options. At this time, a short-term solution is not available. 5. Glen Meadows Subdivision Interceptor Inlets - The initial solution was to add additional outlets along Spencer Highway at the intersection of Valley Brook to divert runoff from Spencer into the subdivision directly to Big Island Slough. Harris County Precinct 2 is currently designing the proposed improvements, and has indicated bidding in the near future. Klotz has noted in its initial assessment that only 9 inlets are located along valley Brook, and that, during a heavy rainfall event, water ponds along the low point near Meadow Crest and results in flooding in the adjacent areas. Klotz is evaluating the feasibility of upsizing the existing outfall pipes or providing a sheet flow path between existing homes. Staff has also ordered additional slotted grates for area inlets to improve runoff. Finally, a resident has suggested angling the outfall structures downstream to improve flow into the outfall ditch. Klotz will also be examining this proposal for effectiveness. Additional information should be available at the March 25, 2008 committee meeting. . Page 2