08-10-20 Drainage and Flooding Committee Meeting Minutes

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JAY MARTINa. --` O CHUCK ENGELKEN Chairman Member V \ m DANNY EARP STEVE GILLETT Vice-Chairman c" Alternate Member kAzzd MINUTES OF THE DRAINAGE AND FLOODING COMMITTEE MEETING AUGUST 10, 2020 The Drainage and Flooding Committee of the City of La Porte met on Monday, August 10, 2020, at the City Hall Council Chambers, 604 West Fairmont Parkway, La Porte, Texas, at 5:00 p.m. to consider the following items of business: Committee Members present: Jay Martin, Chuck Engelken, Danny Earp Committee Members attending remotely: None Committee Members absent: None Council-appointed officers present: Corby Alexander, City Manager; Lee Woodward, City Secretary 1. CALL TO ORDER - Chairman Martin called the meeting to order at 5:00 p.m. 2. CITIZEN COMMENT (Generally limited to five minutes per person, in accordance with state law, the time may be reduced if there is a high number of speakers or other considerations.) There were no citizen comments. 3. STATUTORY AGENDA (a) Presentation, discussion, and possible action to approve the July 13, 2020, meeting minutes. [Jay Martin, Chair] Committee member Engelken moved to approve the minutes; Member Earp seconded the motion and it was adopted, 3-0. (b) Presentation, discussion, and possible action regarding changes to drainage criteria recommended by Harris County. [Lorenzo Wingate, Assistant Director of Public Works] Mr. Wingate discussed the new Harris County requirements and their potential impact on the City (chart from packet below). Alisa Max, P.E., Chief Operations Officer, Harris County Engineering Dept., answered questions from the Committee. Member Earp asked that the City requirement for detention for the entire property size be brought back for consideration. Mr. Wingate noted that Harris County has offered to have their consultant come to La Porte to provide impact analysis to show how the Harris County proposed changes compare to current City requirements. Harris County Requirement Impact to La Porte Atlas 14 rainfall rates to size storm water Minimal impact. Systems are conveyance and detention systems designed using current rainfall characteristics. Increases detention volume 0.55 ac-ft/ac detention rate requirement by 22%. Prohibit detention design using hydrograph Minimal impact. Rarely used for timing design in COLP. No net fill in the current 500-yrfloodplain To be explained by HCFCD/EHRA. Finished floor elevation established at or waterproofed to the 500-yr flood elevation To be explained by HCFCD/EHRA. August 10, 2020-Drainage and Flooding Committee Minutes