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Mr. Ron Bottoms <br />July 22, 2009 <br />Page 6of12 <br />Note: Limits were just upstream of Carlow Street to Armand Bayou, <br />approximately 1.9 miles and did not include the interconnect of B 112-02- <br />00 to B109-00-00. <br />3. Construction Drawings, Spring Gull — HCFC Unit 109-00-00 prepared <br />for HCFCD by J.A. Costanza & Associates Engineering, Inc. <br />("Costanza"), February 1992, (Record Drawings issued on November 19, <br />1991). <br />Note: These are the record drawings for constructing the interconnect of <br />Tributary 1.78 to Willow Springs Bayou (B 112-00-00) to Spring Gully <br />(B 109-00-00). <br />4. Construction Drawings, Preliminary Plan for HCFC Regional Detention <br />Basin Site No. B512-01-00-21-001.0, prepared for HCFCD by Sander <br />Engineering Corporation ("SEC"], October 1994. <br />Note: Construction drawings for excavation in HCFCD BS 12-01-00 <br />providing a design storage capacity of 237 ac-ft at an elevation of 23 ft <br />(1973 NGVD) on an 80 acre tract of land north of Spencer Highway. <br />5. Flood Insurance Study crud Flood Insurance Rate Map (FIR11g]. Harris <br />County, Texas and Incorporated Areas, 11Iap Number 48201 C0940 and <br />48201C1080, by FEMA for the NFIP, November 6, 1996 Map Revision. <br />Up-to-date hydrologic models (HEC-HMS) and hydraulic models (HEC-RAS) based <br />upon information developed as a consequence of the Tropical Storm Allison Recovery <br />Program (TSARP) are readily available from HCFCD and have been incorporated into <br />the information for this project. LiDAR (light detection and ranging technology) <br />elevation data are also readily available from HCFCD. <br />The HCFCD provided Klotz Associates with slab elevations for some of Brookglen <br />Subdivision. In support of the City -Wide Drainage Study (CWDS), the City provided <br />Klotz Associates with their GIS data related to drainage issues, including repetitive loss <br />information, storm sewer layout, culverts data, information on severally flood -damaged <br />homes, inlets and manhole locations, and floodplains maps. Floodplains delineated and <br />recognized by 'the Federal Emergency Management Agency (FEMA) floodplains are <br />shown in Exhibit 1. Repetitive loss data provided by the City is shown in Exhibit 1 &3. <br />options Modeled <br />Each of the options were modeled for preliminary results to determine changes and water <br />surface and flows occur and the magnitude of those changes. A detailed analysis of the <br />