09-12-11 Regular Meeting of La Porte City Council

Browse Search

kIotz,9associates Mr. Julian Garza Jr., P.E. July 5, 2011 Page 3 of 7 3. Prepare an approximate evaluation of this location using either the RAS software or normal depth analysis to evaluate the existing culverts and to determine the benefits and impacts of upsizing or replacing the culverts with larger.culverts. Prepare the evaluation for the 10, 50 and 100 -year flow conditions. 4. Prepare a letter report (including text, tables, construction cost estimate and a few exhibits) and submit the report to staff. Incorporate applicable comments received from staff to the letter report. Submit a final report to staff. 5. Present the results to the Flooding and Drainage Committee, Stop work until receiving written direction from the Ci to proceed with the folloNvin tasks. The purpose of the stop working task is based on the assumption that improving the restriction in the culverts at North P Street could provide significant improvements to the Battleground Estates area and that additional analysis or improvements are deemed not needed at this time. Task #3 - Data Collection and authorize sub - consultants to begin their work: 1. Conduct field reconnaissance. 2, Review available repetitive loss data from FEMA or others for us in the plan. 3. Run LIDAR for the City to develop one foot contour lines. 4. Identify potential ponding areas from a review of the LIDAR data and from a ponding evaluation. 5. Obtain and review the latest available hydrologic and hydraulic models, reports, plans and other helpful data from HCFCD, Harris County, City staff, or from others. 6. Identify problem areas on a map of the City that include: structural flooding, areas of restriction, areas of significant ponding and other areas where drainage problems occur or may occur due to future development potential. 7. Have a meeting with Harris County Flood Control District to discuss the overall effort and to understand any improvements or plans that they may have that could impact the drainage in the Battleground Estates area. 8. Identify a criteria or goal that will be used in determining what is an acceptable goal or solution to the identified problem areas. The criteria may indicate a need to maintain or reduce flows within the area or it may indicate a need to maintain or reduce water surface elevations within an area or the criteria may identify other controlling issues. 9. Use available LIDAR data for the area to develop contributing drainage area and current information on local issues. 10. Use our aerials or aerial information from the City. 11. Work with the City of La Porte staff to understand current development trends and their future plans for the area. 12. Identify areas that may creed updating or additional consideration from the hydrologic or hydraulic models.