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Home My WebLink About1994 Mosby - Lake Augmentation StudyMOSBY AND ASSOCIATES, INC. cl Ns"11I,Jj E 16.r1FCF5 January 28, 1994 2455 14TH AVENUE P.O. BOX 6368 VERO BEACH. FLORIDA 32961 407-569-0035 Mr. Dan Eckis, P.E. City of Sebastian 1225 Main Street Sebastian, Florida 32958 Subject: Sebastian Golf Course -Lake Augmentation Study Sebastian, Florida Engineer's Project No. 94-137 Dear Mr. Eckis: At your request, we are hereby submitting our proposal to provide professional engineering services for the above subject project. Our breakdown scope of work would include the following: 1. Project coordination with the City of Sebastian. 2. Project coordination with the St. John's River Water Management District. 3. On-site review of the existing stormwater tracts within Drainage Basin 5 as noted on the drawing. 4. Preparation of an updated sketch of the area of study of Basin 5 incorporating the topographic information to be provided by the City of Sebastian. 5. Provide stormwater calculations as required by the St. John's River Water Management District to be utilized in the computive use permit renewal. 6. Final submittal and coordination during the review process. We propose to provide the herein described services for a total fee of $1,400.00, excluding direct costs. Mr. Dan Eckis January 28, 1994 Page 2 If at any time during the evaluation and design of the herein stated proposed services it becomes apparent that the described scope of work changes, we will immediately notify you prior to making such changes. Such changes will be considered additional services and will be billed at the following hourly rates: Sr. Engineering: $70.00 Per Hour Jr. Engineering: $55.00 Per Hour Technician: $50.00 Per Hour Jr. Technician: $45.00 Per Hour Administrative: $25.00 Per Hour Expenses for work required which is not covered in the herein described items will be billed as direct costs without mark-up. Direct costs would include such items as printing, permit fees, long distance telephone calls and mileage reimbursement at $0.25 per mile. Invoices for our services will be billed on a monthly basis with payment due upon your receipt of the invoice. A service charge of 1-1/2% per month will be billed for late payments. We are available to begin the work described herein upon our receipt of your written acceptance of this proposal/contract. Should you require further information or clarification, please call. Very t ly y r , MOSB & C C. WIT R dy L. y, P. . RIM:sdp Accepted this day of 1994. Signature Witness MOSBY AND ASSOCIATES, INC. 10�Sl� ,,,.. 2455 14TH AVENUE P.O. BOX 6368 VERO BEACH. FLORIDA 32961 407-569-0035 February 14, 1994 Mr. Dan Eckis, P.E. City of Sebastian 1225 Main Street Sebastian, Florida 32958 Subject: Sebastian Golf Course Lake Augmentation Sebastian, Florida Engineer's Project No. 94-137 Dear Mr. Eckis: Attached are calculations which simulate a 25 year, 24 hour storm (P=9.2511). Based on our discussions and a site visit, we assumed a maximum tolerable 25 year stage of approximately 17.0 (one foot above the existing outfall pipe invert). Beyond this stage, we feel the golf course will sustain significant adverse impacts due to flooding. Using the data provided, there are three apparent drainage basins which ultimately discharge off-site. These basins are broken down as follows: Basin A (Lake "A") Total drainage area = 31.7 Acres Paved (Runway area) = 3.4 Acres Lake Area (@15.5) = 2.9 Acres Open Space = 25.4 Acres CN = .8 (80) + .2(98) = 83.6 Basin B (Lake "B") Total Drainage Area = 9.2 Acres Lake Area (@15.5) = 1.9 Acres Open Space = 7.3 Acres CN = .79 (80) + .21 (98) = 83.4 Mr.'Dan Eckis, P.E. February 14, 1994 Page 2 Basin D (Lake "D") Total Drainage Area = 41.3 Acres Lake Area (@16.5) = 2.2 Acres Open Space = 39.1 Acres CN = .95(80) + .05(98) = 80.9 The purpose of the calculations is to determine the highest on- site storage stage allowable for augmentation with wells. Based on the flood routings, elevation 15.5 is the maximum stage which affords the site with reasonable flood protection, therefore, we recommend no augmentation above that stage. The flood routings include a drop control structure to be incor- porated in place of the existing outfall pipe. The purpose of the control structure is to provide a positive bleed down mecha- nism in order to assure the required storage is available within a reasonable recovery period. A secondary benefit of the struc- ture is it's water quality detention characteristics. Once you have had a chance to review the enclosed, please contact this office to discuss. Thank you for the opportunity to help you on this project. ery_tr.4y yours, Steve `Cooper, P.E. Ste: sap —1 N enc. Advanced Interconnected Channel & Pond Routing (adICPR Ver 1.40) Copyright 1985, Streamline Technologies, Inc. 25 YEAR STORM ANALYSIS 2/11/54 BASIN NAME LAKEA LAKED LAKED NODE NAME ONSITEA ONSITEB ONSITED TIME INCREMENT (min) 5.00 5.00 5.00 RAINFALL FILE SCSII-24 SCSII-24 SCSII-24 RAIN AMOUNT (in) 5.25 5.25 9.25 STORM DURATION (hrs) 24.00 24.00 :24.00 AREA (ac) 31.70 9.20 41.30 CURVE NUMBER 83.60 83.40 80.90 DCIA (%) .00 .00 .00 TC (mins) 30.00 15.00 20.00 LAG TIME (hrs) .00 .00 .00 BASIN STATUS ONSITE ONSITE ONSITE BASIN DMX (i=fs) TMX (hrs) VOL (in) NOTES LAKEA 140.50 12.00 7.25 LAKE "A" DRAINAGE BASIN LAKEB 57.45 11.92 7.22 LAKE "B" DRAINAGE BASIN LAKED 217.55 12.0 6.91 LAKE "D" DRAINAGE BASIN Advanced Interconnected Channel & Pond Pouting (adICPR Ver 1.40) Copyright 1989, Streamline Technologies, Inc. 25 YEAR STORM ANALYSIS 2/11/94 NODE NODE INI STAGE X -COOK Y -COOK LENGTH STACIE AR/TM/STR NAME TYPE (ft) (ft) --------- (ft) (ft) --------- (ft) --------- (ac/hr/af) --------- -------- ---- ONSITEA AREA ------------------ 15.500 .000 .000 .000 15.500 .000 15.500 2.900 16.500 6.000 20.000 31.700 OFFSITE TIME 12.000 .000 .000 .000 12.000 .000 14.000 12.000 14.000 24.000 ONSITED AREA 15.500 .000 .000 .000 15.500 .000 15.500 1.900 16.500 3.000 20.000 9.200 ONS I TED AREA 16.500 .000 . 000 .000 16.500 .000 i00 16.500 2.200 17.500 4.000 20.000 41.000 Advanced Interconnected Channel & Pond Routing (adICPR Ver 1.40) Copyright 1989, Streamline Technologies, Inc. 25 YEAR STORM ANALYSIS 2/11/94 :REACH NAME RC3 FROM NODE ONSITEA TO NODE OFFSITE REACH TYPE DROP STRUCTURE w/ C:IRC:. CULVERT FLOW DIRECTION : POSITIVE AND NEGATIVE FLOWS ALLOWED TURBO SWITCH OFF CULVERT DATA SPAN (in): 24.000 RISE (in): 24.000 LENGTH (ft), 100.000 U/S INVERT (ft7: 9.000 DIS INVERT (ft): 9.000 MANNING N: .024 ENTRNC LOSS: .500 # OF' CULVERTS: 1.000 POSITION A : RECTANGULAR RISER SLOT CREST EL. (ft): 15.500 CREST LN. (ft): .500 OPENING (ft): 999.000 WEIR COEF.: 3.200 GATE COEF.: .600 NUMBER OF ELEM.: 1.000 P'OSIT'ION B : RECTANGULAR RISER SLOT CREST EL. (ft): 16.000 CREST LN. (ft): 10.200 OPENING (ft): 999.000 WEIR. COEF.: 2.600 GATE COEF.: .600 NUMBER OF ELEM.: 1.000 NOTE: OUTFALL STRUCTURE — FLASHBOARD RIS Advanc=ed Interconnected Channel & Pond Routing (adIC:PR, Ver 1.40) Copyright 1589, Streamline Technologies, Inc. 25 YEAR. STORM ANALYSIS 2/11/9# >)>REAC:H NAME : RCI FROM NODE : ONSITED TO NODE : ONSITEA REACH TYPE : C:ULVERT, CIRCULAR w/ ROADWAY FLOW DIRECTION : POSITIVE AND NEGATIVE FLOWS ALLOWED TURBO SWITCH : OFF CULVERT DATA SPAN (in): 24.00o RISE (in): 24.000 U/S INVERT (ft): 16.500 D/S INVERT (ft): 16.500 ENTRNC: LOSS: .500 # OF CULVERTS: 1.000 POSITION A : NOT USED POSITION B : NOT USED NOTE: CULVERT CONN LAKE D TO LAKE A >REACH NAME RC2 FROM NODE ONSITEB TO NODE ONSITEA REACH TYPE CULVERT, CIRCULAR w/ ROADWAY FLOW DIRECTION POSITIVE AND NEGATIVE FLOWS ALLOWED TURBO SWITCH OFF CULVERT DATA SPAN (in): 12.000 RISE (in): 12.000 UIS INVERT (ft): 12.000 D/S INVERT (ft): 12.000 ENTRNC LOSS: .500 # OF CULVERTS: 1.000 POSITION A : NOT USED POSITION B : NOT USED NOTE: CULVERT CONN LAKE B TO LAKE A LENGTH (ft); 40.000 MANNING N: .024 LENGTH (ft): 300.000 MANNING N: .024 Advanced Interconnected Channel & Pond Routing (adlC:PR Ver 1.40) Copyright 1.389, Streamline Technologies, Inc. 25 YEAR STORM ANALYSIS 2/11/94 REACH SUMMARY INDEX RCHNAME FRMNODE TONODE REACH TYPE ------------------- ------ ------------------------------- 1 RCI ONSITED DNSITEA CULVERT, CIRCULAR w/ ROADWAY 2 RC2 ONSITEB ONSITEA CULVERT, CIRCULAR w/ ROADWAY 3 RC:3 DNSITEA OFFSITE DROP STRUCTURE w/ CIRC. CULVERT Advanced Interconnected Channel & Pond RoUting (adICPR Ver 1.40) Copyright 1989, Streamline Technologies, Inc. 25 YEAR STORM ANALYSIS 2/11/94 CONTROL PARAMETERS ------------------ START TIME: .00 END TIME: 24.00 TO TIME SIMULATION INC PRINT INC (hours) (see=s) (mins) 24.00 150.00 60.00 RUNOFF HYDROGRAPH FILE: DEFAULT OFFSITE HYDROGRAPH FILE: DEFAULT BOUNDARY DATABASE FILE: NONE NOTE: Advanced Interconnected Channel & Fond Routing (ad1CPR Ver 1.40) Copyright 1985, Streamline Technologies, Inc. 25 YEAR STORM ANALYSIS 2/11/54 NODAL MAXIMUM CONDITIONS ------------------------------- REPORT I<:------- INFLOW -------%1 NODE STAGE VOLUME RUNOFF OFFSITE OTHER OUTFLOW ID (ft) (af) (cfs) -------- (cfs) ---------------- (cfs) (cfs) -------- -------- ONSITEA -------- 16.93 -------- 1.63 140.50 .00 7.44 17.27 OFFSITE 14.00 16.96 .0o .00 17.27 .00 ONSITEB 17.00 5.53 56.18 .00 .00 .54 ONSITED 18.14 17.69 217.55 .00 .00 7.14