05-02-11 Drainage and Flooding Committee Meeting minutes

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klotAlassociates 1160 Dairy Ashford, Suite 500 Houston, Texas 77079 T 281.589.7257 F 281.589.7309 houston.office @klotz.com Texas PE Firm Reg. #F -929 July 6, 2011 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 Northwest Park Diversion Basin Preliminary Engineering Report Klotz Associates Project No. 0127 Dear Mr. Garza: Klotz Associates is pleased to submit this proposal for a Preliminary Engineering Report for the Northwest Park Diversion Basin Project. The City of La Porte Flooding and Drainage Committee along with City staff have determined that a Preliminary Engineering Report (PER) is needed for the Harris County Flood Control District (HCFCD) Unit B 106 -00 -00 (Big Island Slough) area in La Porte to develop specific recommendations for reduction of residential structural flooding along B 106- 00 -00. Possible reduction in flooding along B106- 00-00 in La Porte using detention at the Northwest Park Diversion Basin and /or the Lomax Riding Arena is to be evaluated. The proposed scope to achieve this evaluation follows below. UNDERSTANDING OF THE PROJECT Unit B106 -00 -00 (Big Island Slough) drains from approximately SH 225 southward to and beyond the City limits at Fairmont Parkway. Previous citywide drainage studies by Klotz Associates have identified significant structural flooding along the slough in La Porte. Using detention to reduce Big Island Slough flood flows may reduce flooding levels along the slough and reduce structural flooding frequency. Possible new detention ponds at the Northwest Park site and /or the Lomax Riding Arena site in the vicinity of B106-00-00 and L Street are to be evaluated to determine their ability to reduce flooding along B 106- 00 -00. We understand that as much as 200 acre -feet of storage may be possible for development at the Northwest Park pond site.