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Piney Point Sewer System

Piney Point Sewer System Studies show that this system is a major source of Inflow entering the Marlay-Taylor collection system All sewer lines have been televised and smoke tested to evaluate the condition of system and many problems were found

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Piney Point Sewer System

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  1. Piney Point Sewer System Studies show that this system is a major source of Inflow entering the Marlay-Taylor collection system All sewer lines have been televised and smoke tested to evaluate the condition of system and many problems were found The system has a long history of near miss overflows during rain events and its proximity to the Potomac River is cause for concern

  2. Inflow – is when water enters a sewer system during and immediately after a rain event. It enters the system through broken pipes, misaligned joints and sometimes through improperly connected down spouts or sump pumps. Infiltration – is when groundwater enters the system when groundwater levels are high and covering the buried pipes. It enters the system through broken pipes or misaligned joints.

  3. During wet months of the year when groundwater tables are high, the average flow at this pump station is 195,000-233,000 GPD During dry months of the year when groundwater tables are low, the average flow at this pump station is 170,000-175,000 GPD During a significant rain event, the flow passing through this pump station has been measured as high as 269,000-418,000 GPD All significant rain events require the use of Septic Haulers to prevent sewage overflows

  4. Piney Point Collection System Flows, Excess of Average Flows Resulting from Heavy Precipitation

  5. Several methods for repairing the sewer system were evaluated to determine the most economical and effective way to resolve the problems identified as shown below. Please note that these are rough estimates and will change when a more complete design is commissioned.

  6. Piney Point Sewer System Project Cost Estimate = $878,900 Loan Interest Rate = 1.6% Loan Period = 20 years Annual Debt Service = $47,264/yr. Funds to Repay this Debt will be recovered through the Commission’s Operation & Maintenance Budget

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