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HomeMy WebLinkAboutM-82-0288G Vincent Z. Grimm, Jro{,'Z ,. Assistant City I•Ianager Donald 11. Cather Dix-e -tor cvf_l i ;Aorks March 22, 1982 Flagami Area Storm Sewer Program Mao The Flagami area defined in this report is that area west of LeJeune Road, north of S.W. 8 Street and south of the Tamiami Canal, which parallels the north City limits. Much of this area has an average ground elevation of 5 to 7 feet above sea level and is underlain with poorly drained soils. These two conditions make it difficult to use conventional local drainage systems such as covered ditches and French drains, which work on the principle of returning the storm water runoff back into the around by means of trench seepage. The most effective way to drain the area is through a positive drainage system which consists of a network of large pipes and catch basins with an outlet to a canal or large body of water. However, this latter method is considerably more expensive and is used only in those areas where no other type of drainaae facilities will work. Because of these low lying elevations and the fact that the South Florida 'Dater Management District is keeping the Tamiami Canal at an elevation higher than it has in previous years due to tile threat o.-LI salt water pollution to the Miami Springs well fields, the Flagami area remains plagued with some severe drainage problems. In Hay 1977, April 1979 and August 1981 water levels in the Tamiami Canal rose to elevation +5.0' or more following heavy rains. When this occurred, the storm outfalls that discharged to the canal became ineffective until tiie water level in the canal receded. Local drains ceased to function until the surrounding ground water was slowly lowered by seepage into the canal. As a result, many streets were seriously flooded. Due to these unique conditions, we have modified our positive storm sewer systerls by ensuring that the existing water table remains as low as possible during the rainy season by the construction of large seepage trench structures and weir chambers which allow groundwater to flow over the weirs and - into the outfall pipe in ordar to drain into the canal as rapidly as possible. Even this latest design, however, will permit flood- ing to occur when heavy rainy are accompanied by high water eleva- tions in the canal - a situation beyond our control. .i TO: fr �i\r �� ^ nt^+ , - �,C'•�•��:: M OT I O W t'aYJ i. .�:n'" .. 16.: .+tit v�.✓tv ... ;. 3 y I Vincent E. Grimm, Jr. -2- March 22, 1982 In order to minimize flooding in the lower regions of the Flagami area, the City has constructed si;t positive storm sewer districts and 300 local drains. Approximately 25,0 of the area is presently served by a positive storm sewer system, as shown in blue on the attached map. The most recent project is the West End District, No. 5 on the map, which was one of the first projects constructed with funds from the 1978 Storm Sewer Bond Issue ($15,000,000). This improvement was constructed in -1980 and repaired in 1981 due to the contractor's faulty workmanship and has not yet had the test of a major storm. We believe that this District will now substan- tially reduce the drainage problems in this extremely low area, centering on S.W. 64 Court and S.W. 6 Street. In addition to this, the City has constructed two local drainage projects in the area with 1978 Bond Funds at a total cost of $400,000. At the April 1, 1982 Commission meeting, we will award the latest contract for storm drainage in the Flagami area. This project is known as the Tamiami Storm Sewer District (No. 6 on the map) and will serve over 200 acres of land, and eliminate 11 major areas of flooding. Over the next three years, we will continue to construct three local drainage projects estimated at a total cost of $800,000. This will bring the City's most recent investments with 1978 Bond Funds in the Flagami area to approximately $2,950,000, which include the West End and Tamiami Districts, two new local drainage projects and three future local drainage projects. Of the remaining $12,000,000 from the 1978 Bond Fund, $5,000,000 has already been spent, leaving a balance of $7,000,000 designated for other areas of the City. For many years the City has requested that Dade County rebuild W. 57 Avenue from S.W. 8 Street to N.P. 7 Street. Construction is finally scheduled to start some time in May of 1982. The storm sewer portion of this project will include positive drainage in the vicinity of West Flagler Street and S.11. 57 Court, which will be tied into our Tamiami District, as shown in red on the enclosed map. JJK:bpm • 82-288 CITY Oor MIA MI STORM 5EWER S } STEM` -- F—LA GA MI AREA = EX/5TING POSITIVE 5TOkIM 5EWER-5 IA, LEJEUUVE GAIWENS DISTAIlCr *430�000 (197i6) 1. LUDLAA4 Dl5'TRICT-s44,00009G6) $, FLAGLER PARK D/STRICT -*81 000 (19G6) ,3, FLAGAM! plSrRICT--'85,od&r19G5) vcST7,90)196%) 5, ET END Dl5TRir0 794,000(18 EXISTING L OCQL DRAINS VALUED A TG02,000,000 rY1zoUaq UT AREA (N0T Si IOWi�I) = )OAlOF05E0 POSITIVE STOR" SEWEeS 6. 7AA41AM1 ©!STRICT- .-STIMArED AT s 900,000 0982) FROPOSED LOCAL Dk1.41AIAGE PROJECr5 3 PRG.IECTS-65Tl"ArED AT 0800,o00 TO ELIMINATE PR054CM AREAS A PROBLEM Ak'EAS _ �t� a,� lit Li 1.3 FA i D 14 1 r�P Y /•M�" _ V x l CTI Gm] �ih]�` �/�—��L_a7C L i� liIIJ i i C�IYY.t�.��Y».M JrIIM+�...���� �>•...�ai.1Y�arwA �.• � ■[iii�'11 J E r r _ � � •,III{ - t•� Go 00 CITY OF MMMI STORY SEWER SYSTEM - FLAGAMI AREA EXISTING P05MVIC 5rolem 5EWEles IA. I-EJEUME 6AAPDB"5 DIZ' 45) 1. LUDLA" Dlsrelcr -Vr4e,1S0r05'tf'4193rooe)oo (197 -LA6LER PARK 0t5rR1cr - -*81, 000 096e) j. FLAGAMI D1srR1cr—t85,oddc19G5) .*. AI.W :52 AVE"LlE D1srje1cr-*q7,000(19,G7) 6. wisr El%fa 015rlzicr - 0 794,000 (1980) EXISTING LQC4L DRAINS 2173 SrRUCrURES r14fzoua*qoz1r AREA (NOTSHOWN) Ar 02,000,000 =PROPOSED POSITIVE ,STORM SEWERS 6. 7,AAflAA41 D15r21C7-- E SrIMATED AT -s 900,000 (1982) p,eOP05ED LOCAL DRAINAGE PROJECTS 3 FRO.11E c r5 - F, 5 rl"A rED AT kaoo, o o o TO ELl"I"ArE PC094E" AREAS FZOBLEA-f Ak"S Nwi f� , : - �� �_ =1 I � i�� lip � � (� ��� IL Ei ELI HUI OV, F-5,0 [Alh] Fs3- --D blCii -- EL 10 1A EiD -8 7-- w co r cns,w .�� � �, CITY OF M/QM/ STORM SEWER SYSTEM-- FLAGAM/ AREA C] EXISTING POSITIVE STO)?M SEWEPS IA. L EJ,EUAIE GA<?DENS D/ST,p/CT - a430, 000 (/976) 1. LUDLAM D167RICT - S44, 000 f/9661 2. FLAGLER PARAC D/STIZICT --*8I 000 0966) 3, FLAGAM/ D/STEP/CT - -,t85, OO&(/965) 5. WESr END D/Srg,,�rs S 794,000'(/ 8OJ/967) ,EX / 37-/NG L O CAL DRAWS 273 STRUGT!/RES rH,70UGNOUr AREA (NOT sA VALUED AT 0 2,000, 000 C] P 60PD AMDDIsrR cr- ESr/VE MAOD AT -S900,000 (, PROPOSED LOCAL DRAINAGE PROJECTS 3 PROJECTS - 65r/MATED A T $800, 000 TO EL IA.f//HATE PAPOBLEM AREAS ® PROBLEM AREAS (o [lL_ s.w. LAOC7=�©EN ff—ilr EIc2® Ea ® rxii3lwr_-.9riCill waa '2 CITY OF M/AMl STORM 5EWE/z SYSTEM- FLAGAMI AREA C� EX/STING POST rl VE 5ToV1W SEWERS IA. L EJEUNE GARDENS DIST,?lGT - *430, D00 (1976) 1 _ L UDL AM D/STi?!CT - $ 4 4, 000 f/900 Z, FLAGLElZ PA!PZ D/STi2/CT —�'8I ODO (/966% 3, FLAGAM/ D/STEP/GT - �85, G?OC;</965) 5. WEST ENO D/STi?/ r - 0 794, 0007'C/980�/967) EX1 STIAIG LOCAL DRAWS 273 VALVED A T02,000,000 G GNOUT AQEA (NOT AU Q PROPOSED POSI Tl VE 5TORA4 SEWEe5 6. TAM/AMl 0/_5re/GT- E STmw-ED AT -9 900,000 PROPOSED LOCAL DRAINAGE fPROJECrS E �M/NA ESP/20�LEM !?EAS 4800, 000 TD 0 PROBLEM ,d 6ZE,4S r ®4 r11202a TER. u71 W ®® a _ © O L Ot I LA- s.w :1[A O o � © EN UE--2 a-W3 En- C2 0 o� tee a=A alK3DNE2E2 raRTbJ�m rIii 7G-2rC9C�wCA Z� CITY OF MIAA41 STORM 5EWER 5 Y,5 TEM - FL A GA M1 A REA =EX15TING POSITIVE 5TOem 5EWIEk,5 IA, LEJEUME GARDENS F.157,4e%ro 6) 44 �*430)000 (197 1. LZIDLA" Disrqlcr 0966) 2. rLAGIER PAAk 0157-RIC7- - *81000 0966 3, FLAGA"I D157-A,1cr--t85,00ar1965) 4. Al. W. 52 AVENUE a15nelcr - 0 97,000 (1967) S. WE57" END 015rRICr - 0 794,000 (1980) EX1STING LOCAL DAM INS 273 STRUCT61RES r"A'0"6�YOUr AREA (Alor smowu) VALZIE0 AT 02,000,000 =PAPOP05F-D POSITIVE STORM SEWERS 6. TAMIAA41 015rR1o7--,Esr1mA7---o .47-8 900,000 (1982) PROPOSED LOCAL DRAINAGE PeOJ,6Cr5 3 PA10JEC7's -,&5r1"ArCD A -*B00000 ,ro B41A,f1AIATE PROBLEM AR48AS OP90BLEM AZEAS CITY OF M/AMl STORM SEWER SYSTEM-- FLAGAM/ AREA C� EXI5TIIVG POSITIVE 5T0/21W5EWE�2S IA. LEJEUNE GARDENS 016TQ1CT-*430�000 (1976) 1. LUDLAM D1src1CT-S44,000 096i5) 2. FLAGLER PARK D/STRlCT - *81, 000 (1966) 3. FLAGAM/ D/STR/GT - -e85, 000 (1965) ¢. N. W. 52 AVENUE 01srR1cT - * 97, 000 (1967) S. WEST END DISTRICT -it 794, 000 (1980) EXISTING LOCAL DRAINS 2 73 S TI2UC rvRks rlymoUGNOUT AREA (NOT SHOWN) VALUED AT' 021000,000 P DP�5�OQT 6AMIAMD%re CTEST/MAO a 900,000 FROP05ED LOCAL DkA IMAGE PROJECTS 3 PROJECTS - E5rl"A 0 AT A800, 000 TO EL IMIAIATE PA:IojgLEM AREAS ® PROBLEM AREAS P/ a I I •off a Ioa y f �e-1 `¢ 9T, (1982) d llLAlfYi1 1 " lJ ONCE P., "I NNN 2 I1 s.w. DE�OCO=�©CW LE__2ri:W-3E4901El c�c�� a© EiiAE.N�E�9A_aao rxiiilW EJ-3 r.-9 Cam ► = 1 00 00 Go