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HomeMy WebLinkAboutDrainage AnalysisState Bank — Longmire Location Parking Lot/Building Renovations Drainage Analysis March 2003 to AITCHELLA/*ORGAN, LLP Engineers & Constructors 511 University Drive, Suite 204 College Station, Texas 77840 Office (979) 260-6963 Fax (979) 260-3564 REVIEWED FOR .P21 J P `! COLLcuI- � a n i TUN ENGINEERING CERTIFICATION I hereby certify that this report for the drainage design for the State Bank Parking Lot/Building Renovations was prepared under my supervision in accordance with the provisions of the City of College Station Drainage Policy and Design Standards for the owners thereof. ,7J' k1-D`sJ Veronica J.B. N401 State of Texas No. STATE BANK PARKING LOT/BUILDING RENOVATIONS DRAINAGE ANALYSIS INTRODUCTION This storm drainage report is written to document and analyze the necessary drainage infrastructure for the State Bank parking lot and building renovations. The Bank plans to construct a new bank building, add new parking areas, tear down the old building and add detention ponds on the State Bank site. This work is to be completed in three phases. The first phase consists of the construction of the new State Bank building with additional parking around the new bank building. The second phase involves tearing down the old bank building and replacing it with additional parking. Phase three consists of demolition of concrete paving and the addition of new curb and landscaping. The drainage facilities for this site will change due to the new construction of the bank building and the addition of parking areas. Because of additional impervious cover to this site, two detention ponds have been designed to reduce the storm water runoff to at or below the existing storm event runoff. The parameters used for design and analysis of pre- vs. post -developed conditions are incorporated to show how the final drainage design will accomplish the desired drainage objectives per the City of College Station Drainage Policy and Design Standards (DPDS). If changes to the site drainage patterns or proposed building square footages affect the assumptions in this report, a letter addendum will be prepared to analyze the effect of the changes and to assure compliance with the College Station Drainage Ordinance. M 010 04 'M a11114F.11YMM:\►`i717�LYy ' The State Bank building is located in south College Station in the Southwood Valley area as shown on Exhibit A. The legal description of the property is Lot 4R-A, Block 14C, Southwood Valley, Section 19, Volume 1006, Page155 and Lot 5R, Block 14C, Southwood Valley, Section 19, Volume 1074, Page 215. 2 State Bank Longmire Commercial and residential development surrounds the State Bank property. The State Bank property comprises 2.19 acres. The proposed improvements increase the pavement area by 0.45 acres, which in turn decreases the grassland by the same amount. This area is mostly located south of the proposed building location, in drainage areas PA- 2 and PA-3, shown on Exhibit D. PRIMARY DRAINAGE BASIN DESCRIPTION As seen on Exhibit A, this property is located in and around the Southwood Valley area, near the intersection of FM 2818 and Longmire. Exhibit B illustrates that the site is located in the Bee Creek Tributary "A" Watershed and that no portion of the site lies within the 100-year floodplain per the Federal Emergency Management Agency Flood Insurance Rate Map Panels 144 and 182, effective date July, 1992. The site is located within a single drainage basin, as seen on Exhibit C. DRAINAGE DESIGN CRITERIA All drainage design is in accordance with the City of College Station DPDS. As such: • The design rainstorm events used are the 5 through 100-year events to analyze the effectiveness of the detention pond design; and • Because of the site size of less than 5 acres, flow calculations are based on the Rational Method, with a minimum time of concentration of 10 minutes. DRAINAGE FACILITY DESIGN Predevelopment Drainage Patterns The site drains into an existing drain inlet, allowing the storm water to be collected into the existing storm drain system, and eventually into Bee Creek Tributary "A". As shown on Exhibit C, a concrete drainage flume separates the State Bank site from the adjacent U.S. Postal Service property. The flume conveys the storm water from the USPS property past the State Bank property, thereby not adding flow to the State Bank site. This allows the study area to be bound by the drainage areas shown on Exhibit C. 3 State Bank Longmire Exhibit 1, located in Appendix A, shows the amount of area designated as grassland, gravel, and pavement (impervious) for each existing drainage area. Exhibit 1 also shows the storm event flows calculated using the rational method, as well as the total pre- and post -development flows. The flows from existing (E) drainage areas EA1, EA4 and EA5 flow along the boundary of the property and are conveyed to the study point shown on Exhibit C. Flows from drainage areas EA2 and EA3 are collected at an existing yard inlet and conveyed to the same study point as above. This total flow is represented as "Total Existing" in Exhibits 4-13. it is anticipated that the new construction will add 0.45 acres of impervious cover to the State Bank property. The conversion of this pervious area (.45 acres or 19,602 square feet) to an impervious area will increase the runoff by approximately 2.8 cfs for the 100-year storm. This increase in runoff was accounted for in the design of the two detention ponds, shown on Exhibit D. Postdevelopment Drainage Patterns The proposed drainage areas shown on Exhibit D are different than the existing drainage areas shown on Exhibit C. This is due to the grade changes of the site caused by the construction of the new bank building and additional parking. Drainage area PA2 now drains into Detention Pond 2 (called Detention Pond A on plans), using grate inlets PA2-A and PA2-B, all shown on Exhibit D. Similarly, drainage area PA3 drains into Detention Pond 3 (called Detention Pond B on plans) by use of grate inlets PA3-A and PA3-B. The following table shows the anticipated 100-year flow to each grate inlet, the required area for each inlet and the proposed grate inlet: Grate Inlet 100-yr. Flow (CFS) Required Area (Sq. In) Proposed Grate, or Equivalent Opening Area (Sq. In) PA2-A 10.7 550 EJIW #V-5736, 38" x 38" 693 PA2-B 2.0 144 EJIW #V-5720, 20" x 20" 175 PA3-A 0.7 36 EJIW #V-5720, 20" x 20" 175 PA3-B 4.0 206 EJIW #V-5724-2, 24" x 24" 221 4 State Bank Longmire The proposed bank location will have roof drains that also feed into the detention ponds using 12" PVC pipe, splitting the flow of the bank's roof to both ponds. Once all the storm water is collected in the two ponds, both will carry the storm water to the existing yard inlet location, which will then convey the storm water to the existing storm sewer system. The existing yard inlet is to be modified from its existing configuration to a v-notch inlet to control the amount of flow from Detention Pond 3, since Detention Pond 2 is also connecting to the existing storm sewer at this location. The top of the inlet will be broken down to the flow line of Detention Pond 3 matching the concrete flumes feeding the inlet from the grate inlets PA3-A and PA3-B. The pre- vs. post -developed hydrographs from these ponds and the tabular hydrograph data are shown in Appendix A. The pre- vs. post -developed runoff values after detention are as follows: Peak Discharge From State Bank Improvements Location 5-Year(efs) 10-Year(efs) 25-Year(efs) 50-Year(efs) 100-Year(cfs) Pre -Developed 9.97 11.19 12.78 14.44 16.23 Post -Developed 9.47 10.64 12.15 13.59 15.12 CONCLUSION The construction of the new State Bank and additional parking areas will cause an increase in runoff due to the increased impervious area from both the parking lot expansion and the construction of the new State Bank. The increases in runoff will be handled with two detention ponds located within the limits of the State Bank property. The detention ponds effectively reduce the post -developed runoff to less than the pre - developed runoff rates for the storm events. 5 State Bank Longmire ❑ ,v i ���=ate �'.� /III J i i ` I--'1 I i l . o -Cl � D FM Zate PROJECT LOCATION c •�'1' ``> 4j Q m • Li N C!] I 000a� o O p a o' o o� ^-0 p' 9 agD m L"770N MP SWE BUK AT LONWIRE Mitchell do Morgon LLP. Conse f g Engines s OnO Constructors 511 University Ns. Eost, SMile 204 College Stotion, 7X 77840 OW) 3W-s F. (409) 260-3 & , ' °"""" M111h.2-3 De¢Ign<4 EY nB ch,c e. : v ee EXHIBIT POTOMAC PLACE 13Iw1►10 NE AE / ZON ;X A NE X q,Q.EL_ I ocC, ZONE X ZONE ZONE X srrE LocATlou 49 71"W r X ZONE NE X NATIONAL FLOOD INSURANCE PROGRAM FIRMA FLOOD INSURANCE RATE MAP BRAZOS COUNTY, TEXAS AND INCORPORATED AREAS PANEL 144 OF 250 (SEE MAP INDEX FOR PANELS NOT PRINTED) CONTAINS: COMMUNITY NUMBEN PANEL SUFFIX BRYAN. CITY OF 480082 0144 C COLLEGE STATION. CITY OF 480083 0144 C Notice to User: The MAP NUMBER show. below should be used when placing map orders; the COMMUNITY NUMBER shown above should he used on insurance applications for the subject community. MAP NUMBER 48041CO144 C EFFECTIVE DATE: JULY 2, 1992 W 11 r g L = C--)W C-4 U OC Q W Ica u ^ R W N I--' C" G p "ss Z N a On sCi z us r• W Q d W ��W d r m (�� GOj yJ N u❑+ V Q e. �+e Z it o o 00 E+ •• or W E.�e W o a L f o eh W^ W w H e 7 z Q z `$ If1 w c W 10 C o VI r ca o �¢ oy WUW �9 f ° � = � ExH131T �<co oX W p, �eq = f3. goC'J W 1.4 o 6. Coto a �oQ/�o WW=�=I�d h_. = ae LAIN La.IWI �1 -cc 0 7 �� Civil Engin a e/ing Hyd/a ulie ei Hydrology: UliLty Planning h Oe¢ign S ile Pla n n�^9 6' Oe¢�gn Sae¢ign SUUdivician Plonnin9 & Oesign Mitchell k Morgan, LLP. Consulting Engineer and Constructor 511 Univerity Drive Eaet, Suite 204 College Station, TX 77840 (e7e) 2ee-ee53 Pm: (979) 280-= OCa IJ c coo a 0o%e `o 2a o u 9%_Dom rc n _vo°aoz 0 `omdc o S: > b t,i tear t/ni�n ry vN. I �J �i S Ss 403 855 �.•r•�•••••••• T'�a------- __».�••����"��� 7.5' SIDE SETBACK 11NE ,.. PA 3 0.565 At i m IDetention Pond 3 I PA3—A (14"x14" Grate Inlet PA3—I3 20"x20" Grate Inlet V—Notched Ink (Existing 'ford Inlet) Study Point iuEtlivision 11-1, k O-i, Morgan, LLPx em and Constructor, rive Eoet, Suite 204 tion, TX 77840 rn.: (979) 2W-3 Appendix A 6 State Bank Longnire ooLt) N- U N M m N .- M (a O a O N N V, 6J N (0 v 0 r 0 = N N (U U> (n Lq N N OO�� C N NNN N NNN NN w OSO U rn N rn nN r N 00 M (O NNtI')00 V N V (D 091 (U N O r "t N LQ 0 M 0 N N n V' 0 0 SZD 42 U SZI = rn m rn of rn m rn of rn of m of rn of rn 6 rn of rn of �I'� N N V' M O> 0 (O O a M( O U m ow C N N N N co N N(D W o N(O(O wN w sow O4? V N n N(ON V = n n n n n n n r r n N(U �- d• 0c! �- 0 N 0 V' � nONM V' N O O w Z� U ZI= M M M M M M M M M M M M M MCl? 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