Wastewater Collection System The Wastewater Master Plan documents that the collection system includes approximately 400 miles of gravity sewer pipe ranging from 4-inch to 54-inch diameter, with the majority at 8-inches diameter. Over 82% of the pipes are PVC material, with the remainder mostly cured-in-place or vitrified clay pipe. Each of the approximately 70 lift stations discharges to a force main pipe. The master plan documents approximately 35 miles of force main with diameters ranging from 4 inches to 20 inches. Most of the lift stations include Flygt pumps and controls. The system also includes 32 flow meters and six rain gauges to provide operators with real-time data describing the flows within the collection system. Land Use and Population Assumptions The Wastewater Master Plan determined the average day and peak two-hour flows for the system based on analysis of historical population and flow data. The plan determined 80 gallons per capita per day (gpcd) for future residential flows, and 950 gallons per acre per day (gpad) for future commercial flows. These quantities include allowance for infiltration and inflow as the collection system ages. The Wastewater Master Plan considered population and flow projections for the following planning periods:
Wastewater Collection System Pearland’s wastewater collection system protects public health by providing wastewater collection services to all businesses and residents inside the City limits. The collection system includes five wastewater treatment plants or reclamation facilities with a total capacity of 16.45 MGD. In 2020, the average utilization for the wastewater system was 9.8 MGD, leaving an excess available capacity of 6.7 MGD. The historic peak day of the wastewater system is 13.2 MGD. Service Area Coverage Due to Pearland’s relatively flat topography, the City operates and maintains approximately 70 lift stations throughout the five basins or service areas. Î Barry Rose: 19 lift stations Î JHEC: 27 lift stations Î Longwood: 12 lift stations Î Reflection Bay: 5 lift stations Î Southdown: 7 lift stations The collection system services the entire City limits, with the exception of the Country Place subdivision. The Silverlake subdivision, which is in the ETJ, is not included in the service area. The system also serves approximately 590 connections outside the current City limits near Max Road. Figure 5.3 shows the collection system service area and the location of the five water reclamation facilities.
FIGURE 5.3: WATER CONNECTION LOCATIONS IN PEARLAND
Î Existing (2020): population of 123,040 and 1,547 acres of commercial Î Five-year (2025): population of 128,495 and 2,762 acres of commercial Î Buildout (2042): 147,040 population and 6,887 acres of commercial These population projections yield the following average day flow projections: Î Existing (2020): 10.4 MGD Î Five-year (2025): 12.0 MGD Î Buildout (2042): 17.4 MGD The plan breaks this flow proportionally across each of the five basin service areas.
Upon adoption of this comprehensive plan and the revised FLUP, the Wastewater Master Plan should be updated to account for increased densities in specific locations related to this new FLUP. The projected buildout commercial acreages may have a different character based on the place types, which may not be as uniform in wastewater discharge as those considered in the master plan. Capital Improvements The Wastewater Master Plan includes a five-year CIP describing projects that will maintain the service level of the wastewater distribution system. These capital projects include rehabilitation for existing lift stations and expansions of water reclamation facilities to provide capacity for future projected flow.
PEARLAND COMPREHENSIVE PLAN 2040
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Chapter 5
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