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Attachment 1 <br />Scope of Work <br />Hydrologic and Hydraulic Study for Taylor Bayou, HCFC Unit A104 -00 -00 <br />City of La Porte Drainage Project No. 19 <br />The City of La Porte City Wide Drainage Study (CWDS), dates! January 2009, recommended <br />channel improvements along Taylor Bayou, HCFC Unit A104- 00 -00, beginning approximately 600 <br />feet downstream of McCabe Road to its corporate city limits, a length of approximately 1,608 <br />feet. The CWDS identified that these channel improvements would reduce potential overbank <br />flooding within the Shady Rivers Subdivision during a 100 -year storm event. Although not <br />included in this scope of work, it should be noted that CWDS also identified HCFC Unit A104 -12- <br />00 as contributing to the existing flooding problems in the Shady Rivers Subdivision. A detailed <br />hydrologic and hydraulic analysis was recommended for project development to: (1) update the <br />watershed hydrology considering new residential and commercial developments in the upper <br />Taylor Bayou watershed; (2) develop a hydraulic model for HCFC Unit A104 -00 -00 from its study <br />limits to SH 146; (3) determine the limits and size of the proposed channel improvements to <br />hydraulically convey a 100 -year design storm within channel banks; and, (4) locate and <br />hydraulically size a mitigation pond volume and control structure to mitigate any downstream <br />adverse impacts from the proposed channel improvements. <br />This hydrologic and hydraulic study is not intended to update or revise the FEMA Flood <br />Insurance Rate Maps (FIRM) for Taylor Bayou, HCFC Unit A104- 00 -00. The FEMA floodplain <br />limits and detailed hydraulics for Taylor Bayou, HCFC Unit A104- 00 -00, end just upstream of <br />Shore Acres Boulevard. <br />City of La Porte CWDS Report Information (January 2009) <br />1. Drainage Project ID: 19 <br />2, Channel: HCFC Unit A104 -00 -00 (Taylor Bayou) <br />3. location Benefiting: Shady River Subdivision <br />4, Modification Type: <br />a. Channel improvement <br />b. Mitigation Pond <br />5. Description: <br />a. Trapezoidal Earthen Channel (Grass) <br />L Length =1,608 feet <br />ii. Maximum Top Width = 78 feet <br />iii. Typical Side Slopes = 3H:1V <br />iv. Excavation Volume = 4.2 acre -feet <br />v. Total Land Acquisition = 1.5 acres <br />b. Channel Dimensions <br />Sta. 33196 to Sta. 34404 (Improved Length =1,208 feet) <br />1. Channel Depth = 8 feet <br />2. Channel Bottom Width = 30 feet <br />3. Channel Side Slopes = 3H:1V <br />4. Manning N Value = 0.035 <br />5. Existing ROW Width = 78 feet <br />6. Est. Min ROW Width M 118 feet (20' Maintenance Berms) <br />CivilTech Page 1 of 3 <br />Fugineeriag, Inc. <br />