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HomeMy WebLinkAboutDrainage_and_Flooding_Final_Report-dated_06-16-2008klotz��lf associates 1 160 Dairy Ashford, Suite 500 Houston, Texas 77079 T 281 .589-72' 7 F 281 589.7309 Jane 16, 2008 houston.officeC3k1otz.com Mr. Ron Bottoms City Manager City of La Forte 604 W. Fairmont Parkway LaPorte, Texas 77571 City of La Porte, Texas City -Wide Drainage Study Creekniont Park Drainage and Overflow Path Short Tenn Project 2 Klotz Associates Project No. 0127.008.000 Klotz Associates was authorizedto proceed with the analysis of r and overflow path f!I" Short Tenn Project Associates, !recommendations.r • cost estimates I. Purpose northernThe purpose of this project is to mitigate flood problems occurring through of !nt Subdivision Section 2 during a high frequency storm event by ! + an extreme event conveyance s • rtp The study area is the Creckniont Park in the Creekmont• / located east of Underwood Road and north of Spencer Highway. (see Exhibit 1). The Creekii-tont Park and Creckmont!• ! also of s pipeline easement and west of Big Island Slough (see Exhibit 2). Creekmont Park is elevated in comparison !nt Subdivision Sectionphotos Appendix t and is a restriction to the sheet flow from the northern part o Creekmont Subdivision Section III�117WWIramI The rcollected were the plans and profiles of drainage area map of North H Street, the hydraulic model for Big Island Slough (13106-00-00), and LiDAR based contours, The information was used to develop different alternatives to size the appropriate stonn sewer pipe system to provide extreme Mr. Ron Bottoms Tune 16, 2008 Page 2 of 6 klotz associates event conveyance path for Creekmont Subdivision Section 2. It should be noted that survey will be needed for the detailed design of the selected alternative. The Creekmont Subdivision Section 2 has experienced several complaints of flooding and ponding water due to the limitation of extreme event conveyance paths to relieve the flows out to Big Island Slough. Using LiDAR-based contours (see Exhibit 2), the area known as Creekmont Subdivision Section 2 naturally drains to Big Island Slough but Creekmont Park currently restricts the overflow path. Creekmont Subdivision Section 2 has its own storm sewer drainage system that can handle a 3 year storm event but does not have an extreme event conveyance path for the large storm events. The storm events analysed for impact are the 5-, 10-, 25-, 50 -, 100-year stones since these frequencies generate sheet flow. The areas labeled "Additional Drainage Axeas" in Exhibit 3 are the areas of concern that this report addresses. Reconstruction of the park could consist of removing soil, regarding the park area and rebuilding the parr, adding an overland flow path that would require significant improvements for it to function properly. This idea was not discussed considering the park is in place, would be significantly expensive and the park is already being used by the community. Creekmont Subdivision Section 2 storm sewer system connects into a 42-inch pipe that is part of Creekinont Subdivision Section 1 (see Exhibit 4). The drainage limitations have been addressed by the different alternatives that are briefly described below. The profiles for the existing conditions and alternatives are it Appendix B Hydraflow Storm Sewer Output. Adding flow to the current existing state may have to be mitigated and the effect will be analyzed with HEC- RAS. A conceptual estimate of the pipes sizes and costs for each option can be found in Tables 3 to 5 and the detail cost estimated are in Table 6 to 8. 'These cost estimates are based on using a contractor to construct the improvements and the cost could be cheaper if part or the entire selected alternative were built by city force and if High Density Polyethylene (HDPE) Pipe were used instead of concrete pipe. HDPE pipe are only built up to a 60-inch and greater size pipes would have to be concrete pipe. i. Alternative I Alternative 1 consist of placing inlets at the entrance of the park to collect the sheet flow from a larger storm event and directing the flow with stonn sewer pipes that will connect to the storm sewer system in North H Street (see Exhibit 5) Alternative 1 is a separate system that will affect the li June 16, 2008 P,age 3 of 6 klutz 1,'11 associates performance of North H Street system. Table I shows the comparison of Hydraulic Grade Line (HGL) difference from the existing and proposed Alternative 1. There will be adverse affect along North H Street. Table I shows LiDAR elevations and Hydraulic Grade Line elevations. Table I shows that at a 10 year storm event, the system will be filled to capacity and ponding will occur. Table 4 shows the pipe sizes and cost estimates for the 5-, 10-, 25-, 50-, 100-year storms that will lower the Hydraulic Grade Line the most without upsizing any part of North H Street. Alternative 1, while helpful, will be able to convey the sheet flow from a 5 year storm event. This alternative does not meet our goal and is therefore not recommended. MMMMIFV37�� Alternative 2 requires placing inlets at the entrance of the park to collect the sheet flow from a larger storm event and directing the flow with storm sewer pipes to the storm sewer system in North H Street and placing a new parallel system on the north side of the street to handle the additional flow (see Exhibit 6). This alternative will add flow to the existing storm sewer system in North H Street and affect the current system in place. However, a parallel system is sized to have no adverse effect. The systems will be connected to North H Street with modifications downstream of the connection to accommodate the additional flow. A parallel system in combination with the existing system will be adequate to accommodate the additional flow. Alternative 2 will have inlets and manholes at the entrance of the park and in the park that will drain into a storm sewer pipe system and connect to North H Street. The existing Hydraulic Grade Line is above the Critical Elevation for the larger storm events (see Table 2). A Hydraulic, Grade Line comparison is shown in Table 2. Calculations were done to estimate the needed capacity of North H Street system that would handle the additional flows. Alternative 2 was designed to not have any adverse effects and have the saint or lower Hydraulic Grade Line along North H Street as the existing system that is in place now. Table 4 shows the pipe sizes and cost estimates required for the 5-,. 10-, 25-, 50-, 100- year storms. The existing system drains both North H Street and Underwood Street and it was not designed to handle the 100 year storm event. Alternative 2 will handle Creekniont Subdivision Section 2 flow for the 100-year event and also have positive benefits for both North H Street and Underwood Street. Alternative 2 will require HCFCD review and approval since new outfall would be required. Right -of -Way (ROW) or easement will be needed for this alternative and the costs for the easement or ROW is not included in the cost estimate. There are several properties that could provide a reasonable route to North H Street. Mr. Ron Bottonm June 16, 2008 Page 4 of 6 k I o t z a s s o c i a t e s Alternative 3 includes the placing of inlets at the entrance of the park to collect the sheet flow from a larger storm event of Creekmont Subdivision Section 2 and directing the flow with. storm sewer pipes to Big Island Sough within a 10 foot easement that the City owns (see Exhibit 7). Alternative 3 is a completely separate system that will convey only the "Additional Drainage" Areas of 48.6 acres to Big Island Slough shown in Exhibit 3. This system will go across the pipeline corridor that is to the east of Creekrnont Park. A survey needs to be conducted before this alternative can be finalized. It is assumed that the pipeline easement will not interfere with the Alternative 3 storm sewer system, but if it does, a siphon may be required to cross the pipeline corridor. This alternative will not connect to North H Street or be in the 1R.ight=of=Way of North H Street and will have its own outlet at Big Island Slough. Table 5 show the pipe sues and cost estimated for the 5-, 10-, 25-, 50-, 100-year storms. Alternative 3 will require HCFCD review and approval since new outfall would be required. Same additional Right -of -Way and/or construction easement may be required for this alternative and the costs for these are not included in the cost estimate. +'fir � �� f � �- f• r �: a The initial assessment of the data shows that any of the alternatives will collect the sheet flow from a larger storm event from the Creekmont Subdivision Section 2 at the location of the Creekiriont Park entrance. The alternatives show possible ways to convey this flow to provide some relief Creekinont Subdivision Section 2. Alternative 1 consists of 910 feet of pipe that will connect to the existing storm sewer on North H Street. The total cost estimate for alternative I will range from $344,000 to $428,000 depending on what storm event is chosen (refer to Table 6 for details). Alternative 2 consists of 1,885 feet of pipe that will connect to North H Street and run parallel on North H Street. The total cost estimate for alternative 2 will range from $725,000 to $1,294,000 depending on what storm event is chosen (refer to Table 7 for details). Alternative 3 consists of 1,322 feet of pipe that will outfall into Big Island Slough. The total cost estimate for alternative 3 ranges from $474,000 to $571,000 depending on what storm event is chosen (refer to Table 8 for details). Mr. Ron BottonZ June 16, 2008 Page 5; of 6 1 'Y'l Conclusion k I o t z a s s o c i a t e s The costs for the various alternatives are listed in Tables 6 through 8. We recommend that the City first work with the identified property owners to detennine if an economical sheet flow path with any needed easements could be acceptable to all. Each alternative presented requires that the City coordinate with property owners in determining an appropriate alternative to be considered in Phase 2 Detail Design. Mitigation may be needed during the design phase with HCFCD depending on the selected alternative. Using HEC-RAS, Big Island Slough water surface elevation will raise about 0.05 feet upstream of Big Island Slough because of the additional flow that is directed during a 100 year storm event (See Appendix Q. We are available to discuss the report with you at your convenience should you have any questions regarding our findings. We look forward to moving into the nest phase of this study. Sincerely, j4jOr'r,eE. Gutierrez For: Gary L. Strazick, P.E., CFM Vice President MR E I M1. CC: Mr. Steve Gillett, City of La Porte Mr. John Joerns, City of La Porte Mr. Rodney Slaton.. City of La Porte k I o t z 4 I I a s s o c i a t e s ""WIRWIM Tables I Alternative I AGL Comparison Tables 2 Alternative 2 HGL Comparison Tables 3 Pipe Sizes for Alternative I Tables 4 Pipe Sizes for Alternative 2 Tables 5 Pipe Sizes for Alternative 3 Tables 6 Cost Estimates for Alternative I 'Fables 7 Cost Estimates for Alternative 2 Tables 8 Cost Estimates for Alternative 3 lxfffffl�� Exhibit I Vicinity Map Exhibit 2 Aerial Map Exhibit 3 Drainage Area Map Exhibit 4 Creekniont Subdivision Section 2 Exhibit 5 Alternative I Exhibit 6 Altemative 2 Exhibit 7 Alternative 3 ZZENUTI= Appendix A Representative Photographs Appendix B Hydraflow Storm Sewer Output Existing North H Street Alternative I Alternative 2 Alternative 3 Appendix C HEC- RAS Output d a L _.- --- T V o p��•, 00 � W p j r ,PA co rn je N N m l0 d � N Q+ O r� W'7 u) O 9 W ll yet O 66 rr'. W N N L) a WI N N rm > w -® a z~ N N N N U 3 W O N N :i fl. F 14 u O Obi n c7i A N N N m «. 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C4 C4 L yr L Q� N; 0 CO lirz— Y CV- !p' Representative Photographs Klotz Associates City -Wide Drainage Study Project No.- 0127.008.000 City of La Porte Creekmont Park Photographs Takers: February 26, 2008 Creekmont Park Parking Lot Klotz Associates City -Wide Drainage Study Project No.: 0127.008.000 City of La Porte Klotz Associates Photographs Taken: February 26, 2008 Creckmont Park Playground Equipment Photographs Taken. -February 2 6, 2008 City -Wide Drainage Study City of La Porte Creekmont Park Klotz Associates City -Wide Drainage Study Project No.: 0127,008.000 City of La Porte Appendix B Hydraflow Storm Sewer Output Klotz ?associates City -Wide Drainage Study Project No.: 0127.008.000 City of La Porte .7, CD CD C) 0 CD CQ co C� 0 m cq N 00 00 JnO 96'l,l,'j3'AUj r s ; , Wild oo'iz� '13 J 8 ZU1 II �, � � � � I��I� j i ) w U I qq'� '13 'A U I Ino OIR- i, 1, '13 'AU I Dolz 'G WQd 00'sv+ 6z ells 0 Cl 1 u I L-O'l, 1. 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CO w t N = r, CO � co 'o co � 0 a r MLL` u c of m n o, `V s o ux co m r 0 L � o u 31 D o co/O�i J ID O,....,...,.,.,.,,,,., ..., Z Z J Z fi cV M et" Appendix HEGRAS Output Klotz Associates City -Wide Drainage Study Project No.: 0127.008.000 City of La Porte EXISTING VFC-V, Klotz Associates City -Wide Drainage Study Project No.: 0127,008,000 City of La Porte Klotz Associates City -Wide Drainage Study Project No. 012T008.000 City of La Porte