Free Programmes
https://nofdpidss.sourceforge.net/index.php
The nofdp IDSS is an open source application for the interactive development of flood risk strategies and 1D hydrodynamic flood simulation. Additional modules for ecological and spatial analysis, multicriteria evaluation, flood risk maps, flood frequency, flood duration and communication are included.
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https://www.epa.gov/athens/wwqtsc/html/qual2k.html
QUAL2K (or Q2K) is a river and stream water quality model that is intended to represent a modernized version of the QUAL2E (or Q2E) model (Brown and Barnwell 1987). Q2K is similar to Q2E in the following respects:
One dimensional. The channel is well-mixed vertically and laterally.
- Steady state hydraulics. Non-uniform, steady flow is simulated.
- Diurnal heat budget. The heat budget and temperature are simulated as a function of meteorology on a diurnal time scale.
- Diurnal water-quality kinetics. All water quality variables are simulated on a diurnal time scale.
- Heat and mass inputs. Point and non-point loads and abstractions are simulated
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https://www.epa.gov/ttn/chief/softwar...9_3/index.html
WATER9, the wastewater treatment model, is a Windows based computer program and consists of analytical expressions for estimating air emissions of individual waste constituents in wastewater collection, storage, treatment, and disposal facilities; a database listing many of the organic compounds; and procedures for obtaining reports of constituent fates, including air emissions and treatment effectiveness.
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https://www.hec.usace.army.mil/software/hec-ras/index.html
Version 4.1 of the River Analysis System (HEC-RAS) is now available. This version supersedes version 4.0, which was released in March of 2008 to the general public, and all previous versions. Several new simulation features have been added to the program since that time.