Matrix Design Group assisted the City and County of Denver in the development of a Sanitary Sewer Master Plan (SSMP) to determine wastewater collection system needs and guide capital improvements over the next 50 years. The SSMP is a “living document” that undergoes continual modification utilizing the City’s Geographic Information System (GIS) and new hydraulic modeling tools to routinely update planning information, collection system configuration, and the capital improvement program. The SSMP will allow the City to analyze “what-if” scenarios to predict sanitary sewer system impacts from changes in land use, population forecasts, timing of development, wastewater flow criteria, and other factors. 

Blueprint land-use information, published population forecasts, and wastewater flow criteria were used to support hydraulic modeling to predict current and future flow conditions. Computed existing flows were compared to measured wastewater flow data when available to calibrate the hydraulic model. A Capital Improvement Program (CIP) was also developed for capacity-limited reaches along with planning level cost opinions for recommended improvements. In addition, condition-limited reaches were identified from city operations and maintenance records and rehabilitation methods and associated cost opinions were prepared for inclusion in the CIP.