Steady State InfoSewer and H20Map Sewer

The purpose of a sanitary sewer system is to convey wastewater from various origins at various rates of flow. The maximum and minimum flow rates in a single day can vary greatly. The system should be able to carry the maximum rate of flow without backing up to any significant degree and within the acceptable velocity limit. The system should also be able to convey the minimum flow without deposition of suspended solids. InfoSewerH20Map Sewer allows you to effectively simulate the system’s hydraulic behavior at any specific time period and analyze it under various conditions. Hydraulic calculations are based on the assumptions of one-dimensional, incompressible, steady flow with constant rate of flow between concentrated inflows or outflows. The calculations deal primarily with change in depth and velocity of flow along the sewer (ASCE 1982).

For steady-state analysis, all flows are assumed to accumulate in the system and discharge only at the outlets. This means that even if a pipe has a flow beyond its maximum capacity, the flow is still carried downstream including through pumps and force mains. The transition between gravity flow and pressurized flow is also ensured by assuming that all flows are transported through each force main, subject to the upstream hydraulic control.

Peaking factors and the peaking Tab are a key difference between Steady State and EPS simulations.

Another key difference is that complicated upstream and downstream Force Mains are not allowed in the Steady States solution. Error 1352 is a typical error message

Error 1352: invalid split-flow configuration for given force-main without advanced forcemain network support

65 10 30 0.000000 0.000000 182.051359 6.000000 111.000000 0

Flooding at manholes and wet-wells in InfoSewerH20Map Sewer is not modeled during an extended period dynamic simulation. Instead, the