HydroPol2D — Distributed hydrodynamic and water quality model: Challenges and opportunities in poorly-gauged catchments

Floods are one of the deadliest natural hazards and exacerbated by changes in land-use climate. Urban development decreases infiltration reducing pervious areas increases accumulation pollutants during dry weather. It also periods. During rainy events, there is an increase pollution concentrations runoff that may be a source water supply drought Modeling quantity quality dynamics stormwater requires coupled hydrodynamic module capable estimating transport fate pollutants. In this paper, we evaluate applicability distributed model with (HydroPol2D). First, compared to GSSHA WCA2D V-Tilted catchment, limitation critical velocity investigated. We applied laboratory wooden board focusing on validation numerical approach simulate dynamics. Then, apply HydroPol2D Tijuco Preto São Carlos - Brazil, compare modeled results full momentum solver HEC-RAS 2D. This catchment shares similar characteristics many poorly-gauged human-impacted catchments worldwide. The implementation model, governing equations, estimation input data discussed, indicating challenges opportunities scale into reality scarcity larger catchments. For 1-yr return period rainfall antecedent days, assuming uncertainty 40% parameters, indicate maximum concentration total suspended solids (TSS), load mass pollutant washed 30% volume are, 456±260 mgL-1km-2, 2.56±0.4 kgs-1km-2, 89%±10%, respectively.