09-12-11 Regular Meeting of La Porte City Council

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REQUEST FOR CITY COUNCIL AGENDA ITEM Agenda Date Requested: September 12, 2011 Requested By: Julian Garza Department: Planning Report: X Resolution: _Ordinance: Exhibit: Proposal for Engineering Services for Battleground Estates Proposed Improvements Exhibit: Exhibit of Proposed Improvements for Battleground Estates Exhibit: Proposal for Engineering Services for Shade River Proposed Improvements Exhibit: Exhibit of Proposed Improvements for Shade River Appropriation Source of Funds GEN 957 Account Number: 050 -9892- 957 -1100 Amount Budgeted: S224,220.00 Amount Requested: S224,220.00 Budgeted Item: X YES NO SUMMARY On August 4, 2011 Staff presented to the Drainage Committee Proposals for Engineering Services as authorized by City Council on Mav 23, 2011, for Preliminaiv Engineering Design of Battleground Estates and Shady* River. The Drainage Committee authorized Staff to present these proposals to City Council for approval. Preliminaiv En ing eering Design of Battleground Estates: This report will evaluate and determine what improvements are needed to reduce the structural flooding within Battleground Estates. This work effort will be a two phase approach with the first phase evaluating the restricted culverts at North P Street and the F101 -00 -00 channel and the second phase evaluating the local drainage element within the Battleground Estates and the downstream channels. Staff will present the results of phase 1 and request authorization before proceeding with phase two. The scope of work includes all elements necessaiv for design including Geotechnical Investigation, Environmental Study* and Surveving. Preliminaiv Engineering Design for Shadv River (Taylor Bavou, HCFC Unit A- 104- 00 -00) This report will include updating the watershed hydrology to include new residential and commercial development in the upper Taylor bayou watershed, develop a hydraulic model for the channel from its study* limits to SH 146, determine the limits and size of the proposed channel improvements to hydraulically convey* the 100 year design storm within the channel banks and locate and hydraulically size a mitigation pond volume and control structure to mitigate impacts from the proposed channel improvements. This work will be phased by task to avoid unnecessaiv engineering design if the hydrologic analysis concludes that channel improvements are not needed. The scope of work does not include the necessaiv design elements including detailed survey* information, Geotechnical Investigation and Environmental Study* due to the nature of the scope.