Drainage_and_Flooding_Report-dated_03-10-08

Browse Search

Hydrologic & Hydraulic Analysis Port Crossing Development Prepared For: Port crossing land, L.P. Prepared By: Goldston Engineering, Inc. June 2006 Location : West Fairmont Parkway and 146 The Port Crossing Land, L.P. contracted Goldston Engineering, Inc. to provide supplementary hydrologic and hydraulic consulting services for the Port Crossing Development. The project area and area of analysis fall under the jurisdiction of the City of La Porte, Texas. Ultimate outfall into the Taylor Bayou (HCFC Unit A104-00-00) calls for a drainage analysis that confirms the proposed development is designed in accordance with the policies, guidelines and criteria of the jurisdictional agency in conjuction with oversight review and approval of the Harris County Flood Control District. The developer plans to develop the tract for business, industrial and commercial uses. The Restricted Reserve Detention Basin North (7.34 acres) is for 118.65 acre with 29.49 acres that will be fully developed and will have two wet bottom ponds. The storage volume is 47.71 acre-feet at full bank capacity, which is the equivalent of a storage rate of 1.59 acre-feet/acre due to restricted Taylor Bayou 10-year and 100-year pre -development release criteria. The Restricted Reserved Detention Basin South 22.75 (acres) is for 267.33 acres of fully developed runoff and provides regional detention for the 430 acres that comprise the HCFC A104AI sub -area. The storage volume is 224.30 acre-feet at full bank capacity with a storage rate is 0.82 acre-feet/acre due to restricted Taylor Bayou 10-year and 100-year pre -development release criteria. A trapezoidal conveyance channel will carry runoff north to south from the detention ponds. It will have a 0.001154 channel slope with a 6 foot bottom width and 8 to 10 feet depth and concrete bottom lined. It appears that this report is marked up for review, substantial comments are made.