| Date |
Text |
| 2019-10-30 10:21:37 | THE FOLLOWING COMMENTS ARE FROM THE REVIEW OF THE |
| | OCTOBER 28, 2019 SUBMITTAL REVIEW PACKAGE: |
| | |
| | 1. WEIR ELEVATIONS ARE HIGHER THAN PAVEMENT GRADE |
| | ELEVATIONS. APPLICANT RESPONDED THAT THE EXFILTRATION |
| | TRENCH IS DESIGN TO STORE THE RUNOFF FROM THE 10-YEAR |
| | 1-DAY DESIGN STORM EVENT WITHOUT THE PARKING LOT |
| | FLOODING. THE OVERFLOW WEIR ELEVATION FOR EACH PARKING |
| | LOT WAS SET TO CONTAIN ONSITE THE RUNOFF FROM THE |
| | 10-YEAR 3-DAY DESIGN STORM. |
| | |
| | OVER TIME THE EFFECTIVENESS OF THE EXFILTRATION SYSTEMS |
| | TO DISPOSE OF THE STORMWATER RUNOFF WILL DIMINISH TO |
| | THE EXTENT THAT THE PARKING LOT WILL LIKELY FLOOD FOR |
| | STORM EVENTS SMALLER THAN THE 10-YEAR 1-DAY DESIGN |
| | STORM. THE APPLICANT SHOULD BE AWARE THAT THERE IS A |
| | RISK OF THERE BEING 12 TO 17 INCHES OF STANDING WATER |
| | IN THE PARKING LOTS DURING AND AFTER A STORM EVENT AND, |
| | DEPENDING ON THE GROUNDWATER TABLE AND EFFECTIVENESS OF |
| | THE EXFILTRATION TRENCHES, THE PARKING LOT(S) MAY BE |
| | FLOODED FOR AN EXTENDED PERIOD OF TIME. |
| | |
| | IT IS RECOMMENDED THAT THIS FLOOD RISK NOTICE BE |
| | INCLUDED IN ANY USE LEASE AGREEMENTS WITH THIRD |
| | PARTIES. |
| | |
| | 2. DRAINAGE SYSTEMS TO BE DESIGNED TO MEET SFWMD |
| | CRITERIA FOR STORMWATER QUALITY AND PEAK DISCHARGE FOR |
| | PRE- VS POST-DEVELOPMENT CONDITIONS. THERE IS A |
| | MODIFIED EXFILTRATION TRENCH EQUATION WHEN (DS > DU) OR |
| | (W > 2* [DU + DS]) |
| | |
| | 3. ALL DRAINAGE STRUCTURES CONNECTED TO EXFILTRATION |
| | TRENCHES SHALL HAVE POLLUTANT RETARDANT BAFFLES OVER |
| | THE EXFILTRATION PIPE CONNECTION (WHETHER "UPSTREAM" OR |
| | "DOWNSTREAM" OF THE EXFILTRATION TRENCH). |
| | |
| | 4. VERIFY DRAINAGE STRUCTURES ARE LARGE ENOUGH FOR THE |
| | INSTALLATION OF MORE THAN ONE PRB OR PRB AND WEIR IN |
| | THE STRUCTURES. |
| | |
| | 5. PROVIDE CCTV VIDEO OF EXISTING DRAINAGE PIPES FROM |
| | THE ALLEY TO THE CANAL. |
| | |
| | 6. SHOW AND LABEL THE PERIMETER BERM AND PROVIDE A |
| | DETAIL/CROSS SECTION OF THE BERM. |
| | |
| | 7. CONFIRM IF STRUCTURE D-200 WILL CONNECT TO ONE OR |
| | TWO EXISTING NORTH-SOUTH DRAINAGE PIPES RUNNING ACROSS |
| | THE PROPERTY. TWO STORM LINES ARE SHOWN ON SHEET P-3. |
| | |
| | 8. SHOW ON THE ENGINEERING PLANS AND LANDSCAPE PLANS |
| | THE PROPOSED EASEMENTS OVER THE EXISTING DRAINAGE PIPES |
| | CROSSING THE PARKING LOTS AND OVER THE SANITARY SEWER |
| | MAIN ALONG THE SOUTH PROPERTY LINE. THE DRAINAGE |
| | EASEMENTS WILL BE 10-FEET WIDE CENTERED ON THE PIPES. |
| | IF MULTIPLE PIPES (SEE COMMENT NO. 7 ABOVE) THEN THE |
| | EASEMENT WILL BE 15 FEET WIDE CENTERED BETWEEN THE |
| | PIPES. THE UTILITY EASEMENT FOR THE SANITARY SEWER MAIN |
| | WILL BE 5 FEET WIDE ALONG THE SOUTH PROPERTY LINE WHERE |
| | THE MAIN IS LOCATED. |
| | |
| | 9. ADDITIONAL ROOT BARRIERS WILL BE NEEDED (LANDSCAPE |
| | PLANS) BETWEEN PROPOSED TREES AND THE EXISTING DRAINAGE |
| | PIPES. |
| | |
| | |
| | TRACY WARD, PE |
| | SENIOR STORMWATER ENGINEER |
| | ENGINEERING SERVICES DEPARTMENT |
| | 561-494-1120 |
| | [email protected] |
| | |
| |
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