Hydrology / Watershed Analysis and Planning

Our experience with diverse watershed systems and climate zones provides a solid understanding of natural physical hydrologic processes with the intent of accurately evaluating the watershed response. We utilize advanced computer modeling applications including HEC-1, HEC-HMS, WMS, XP-SWMM, MIKE and “continuous models” for different applications and assessment of historical data.  The use of GIS and DEMs are primary tool we have integrated with our watershed analysis and hydrologic modeling efforts.  Watershed assessments are performed based on our advanced technical background and analytical techniques in (1) weather precipitation, evaporation, infiltration, and hydrologic measurements, snowmelt, (2) rainfall-runoff analysis, (3) statistical analysis, and (4) flood routing techniques.  Specialization with a variety of hydrologic simulation models which includes modern methods for simulation rainfall and runoff, snowmelt/accumulation, and flood hydrograph prediction.  Applications with the use of NEXRAD radar data to estimate rainfall intensities and hind-cast storm event runoff.

Urban Drainage Master Planning: PACE’s background in urban drainage systems includes a wide variety of specialized underground and open channel facilities that require unique hydraulic analysis techniques.  PACE maintains an extensive library of technical drainage guidance manuals from almost every state in the nation that facilitates providing background to different types of systems typically utilized.  Urban drainage master planning is one of the key aspects that combine the extensive use of the available drainage design criteria and application of hydrologic and hydraulic principles. Comprehensive and technically accurate investigation of the hydraulic capacity for stormwater drainage and flood protection systems provide the foundation for assessing potential flood damage and identifying solutions as part of a comprehensive master planning process.  Our background in flood protection master planning has resulted in the development of a detailed technical program to effectively determine the most cost-beneficial system from a range of alternatives formulated in the planning process.  A variety of different hydraulic modeling programs have been developed to thoroughly analyze the hydraulic capacity of drainage systems.  Sensitivity analyses are routinely performed as part of this investigation to determine “cause and effect” relationship from different influences on the hydraulic systems.  Understanding of urban drainage system involves not only the conveyance facilities, but also the ability to intercept surface flows.  The master plan process requires the identification of these deficiencies and evaluating the benefit of improving the deficiency for the associated costs of construction.  PACE’s urban drainage solutions focus on the “system” to provide the desired level of flood protection, rather just on individual elements. PACE has successfully incorporated urban drainage facilities into aesthetically appealing manmade lakes and streams. These systems provide effective flood protection by conveying and retaining urban flows, as well as natural water quality treatment in bio-engineered wetland planters.