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2.1.3 Code and input arguments
class urbanwb.pavedroof.PavedRoof(intstor_pr_t0, pr_no_meas_area, pr_meas_area, pr_meas_inflow_area, intstorcap_pr=1.6, swds_frac=1.0, discfrac_pr=0.0, **kwargs) [source]
Bases: object
Creates an instance of PavedRoof class with given initial states and properties, iterates sol() function to compute states and fluxes of Paved Roof at each time step.
Parameters:
- intstor_pr_t0 (float) – initial interception storage on Paved Roof (at t=0) [mm]
- r_no_meas_area (float) – area of Paved Roof without measure [m^2]
- pr_meas_area (float) – area of Paved Roof with measure [m^2]
- pr_meas_inflow_area (float) – measure inflow area from Paved Roof, i.e. runoff inflow area to measure from Paved Roof (>= area of Paved Roof with measure and <= total area of Paved Roof) [m^2]
- intstorcap_pr (float) – predefined interception storage capacity on Paved Roof [mm]
- swds_frac (float) – part of urban paved area with storm water drainage system (SWDS) [-]
- discfrac_pr (float) – part of Paved Roof that is disconnected from sewer system [-]
inflowfac() [source]
Calculates measure inflow factor of Paved Roof.
Returns: Measure inflow factor of Paved Roof
- inflowfac – measure inflow factor is calculated as (runoff inflow area to measure from Paved Roof - area of Paved Roof with measure) / area of Paved Roof without measure
Return type: (float)
sol(p_atm, e_pot_ow) [source]
Calculates states and fluxes on Paved Roof during current time step.
Parameters:
- p_atm (float) – rainfall during current time step [mm]
- e_pot_ow (float) – potential Open Water evaporation during current time step [mm]
Returns: A dictionary of computed states and fluxes of Paved Roof during current time step
- int_pr – Interception storage on Paved Roof after rainfall at the beginning of current time step [mm]
- e_atm_pr – Evaporation from interception storage on Paved Roof during current time step [mm]
- intstor_pr – Remaining interception storage on Paved Roof at the end of current time step [mm]
- r_pr_meas – Runoff from Paved Roof to measure during current time step (not necessarily on Paved Roof itself) [mm]
- r_pr_swds – Runoff from Paved Roof to storm water drainage system (SWDS) during current time step [mm]
- r_pr_mss – Runoff from Paved Roof to combined sewer system (MSS) during current time step [mm]
- r_pr_up – Runoff from Paved Roof to Unpaved during current time step [mm]
Return type: (dictionary)
2.2 Closed Paved
Closed Paved areas are mainly areas with paved covers like roads, parking lots, driveways, etc. that are made of impermeable material like cement and bituminous concrete pavement. In terms of conceptual modelling mechanisms, Closed Paved is quite similar to Paved Roof. On the surface of a typical impermeable paved area, a small amount of rainwater is intercepted as surface ponding which can only be emptied through evaporation. Rainfall exceeding the interception storage capacity will generate runoff, which flows to the sewer system (SWDS and/or MSS). The disconnected fraction of runoff is assumed to flow to the Unpaved area (UP). Figure 5 provides a schematic overview.