05-02-11 Drainage and Flooding Committee Meeting minutes

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klotzO Fassociates 1160 Dairy Ashford, Suite 500 Houston, Texas 77079 T 281.589.7257 F 281.589.7309 July 5, 2011 houston.office @klotz.com Mr. Julian Garza Jr., P.E. Planning Department Senior Engineer City of La Porte 604 West Fairmont Parkway La Porte, Texas 77571 Re: Scope of work and budget for Preliminary Engineering Report to address flooding in the Battleground Estates area Klotz Associates Project No. 0127 Dear Mr. Garza: Klotz Associates is pleased to submit this proposal to prepare a Preliminary Engineering Report to address the flooding in the Battleground Estates area. The City of La Porte Flooding and Drainage Committee along with city staff have determined that a Preliminary Engineering Report is needed for the Battleground Estates area to develop specific information and recommendations on structural flooding within the Battleground Estates area. Listed below is the scope of work associated with the preparation of the Preliminary Engineering Report. We have included a detail scope of work below to provide the City with information on the details and approach to preparing the Preliminary Engineering Report. Some of the listed task items do not take much time and effort and some of the listed task items will take more time and effort to complete. Understanding of the Project The Battleground Estates subdivision drainage is influenced by multiple channels and by roadside ditch drainage. Each of the channels and the roadside ditches could impact the drainage within the subdivision. The goal is to evaluate channel F101-00-00 and the roadside ditch drainage system within the Battleground Estates area and to determine if channel improvements, improvements to areas of restriction, addition of sheet flow relief systems, detention or other improvements are needed to help reduce the flooding of structures. Hydrologic and hydraulic (H &H) analysis of the channels would be needed to document the possible change and to document the benefits and impacts to the adjacent channels. The Battleground Estates subdivision includes over 220 homes, 250 lots and about 230 location where roadside ditches and culverts drain the subdivision. The existing roadside ditches and culverts vary in size and elevation. We propose to survey the location, size and flow line of each of the exiting culverts within the subdivision and some downstream so we can use that information to determine which culverts meet appropriate criteria in terms of pipe size, flow line and channel size. We will then use the results of that analysis to make