O-2002-2555 - Laserfiche WebLink

Browse Search

SCOPE OF WORK The scope of work has been prepared in consultation with the City of La Porte. The work tasks are discussed as follows: Task 1.0 - Study Coordination The Consultant will coordinate with the City of La Porte, the La Porte Redevelopment Authority, Harris County, Harris County Flood Control District, Texas Department of Transportation, and other government agencies for input into the study process. We will conduct progress meetings monthly to discuss the study progress, issues and deliverables. Written status reports will be submitted along with all verbal and written communications with other agencies. Task 2.0 - Data Collection The value of thorough data collection and evaluation has been proven repeatedly in many studies similar to this study. The City of La Porte will provide all available study reports, maps, and other pertinent data available in their files. Requests for information will be submitted to Harris County Flood Control District and other agencies to obtain available topographic maps, historical flooding data, hydrologic and hydraulic models, etc. for the watercourses in the watershed. Task 3.0 - Determine Watershed Conditions and Characteristics An inventory of the existing and future watershed conditions will be determined for this study. Pertinent watershed characteristics include land use type and spatial patterns. Other applicable mapping data, in digital format or paper, will also be identified and obtained, including historical development patterns, and land use projections. Aerial maps and the field reconnaissance will be used to generate and verify existing land use conditions in the watershed. Land use projections will be documented in the study for future flood control planning. Deliverables include a description of the watershed conditions with digital maps (Arc View GIS) showing existing and future development in the study area. Task 4.0 -Hydrologic Analyses The hydrologic analysis will be performed for the study area using the U.S. Army Corps of Engineers HEC-l "Flood Hydrograph Package". The hydrologic model will be used to compute the runoff hydrographs and peak flow rates at strategic locations in the watershed. The existing hydrologic model for Taylor Bayou Watershed will be used for the study area. A watershed map will be prepared for the Taylor Bayou Watershed. Subareas will be chosen with regard to drainage area, shape, and runoff characteristics. The watershed and subarea drainage map will be prepared in ArcView GIS format. The existing level and types of development within each subarea will be identified from the watershed maps, field reconnaissance, and aerial maps. The 10-, 50-, and 100-year storm frequency events will be analyzed for existing and future land use conditions. Task 5.0 - Hydraulic Analyses A limited hydraulic analysis will be performed to evaluate approximate channel capacity for the following channels: o HCFC Unit A 104-00-00 (Taylor Bayou): Upstream of Shore acres Blvd o Unnamed Tributary to HCFC Unit A 104-00-00 The hydraulic analysis will be performed using normal depth computations. Channel and overbank definition will be defined based on topographic data obtained from USGS quadrangle maps. Page 2 of 3 Pages (Exhibit SR-Al - Study Objectives, Background and Scope of Work)