FKA-File

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Input files · ALL SYS · FKT KTR · EXT JGG WGG TGG · TAL HYA TRS EIN URB VER RUE BEK EZG FKA · BOA BOD LNZ EFL · DIF


Urban catchments

also refer to Theory:Urban catchment

File

*Kanalisierte Flächen (*.FKA)
*======================
*|------|-----|-----------------|--------|------------------|-----|----------|-----------------------------------------------------|
*| Bez  | KNG |       EZG       |   N    |   Verdunstung    | PSI | SCS (2)  |             Trockenwetterabfluss                    |
*|      |     |   A    VG   tf  | Datei  |Kng Sum    Datei  | (1) | CN  VorRg| Einw.  Qh   JGG WGG TGG   Qg  JGG WGG TGG   Qf  JGG |
*|------|-----|-----------------|--------|------------------|-----|----------|-----------------------------------------------------|
*|  -   | 1-2 |  ha     %   min | Nummer |1/2 mm/a   Nummer |  -  |  -   mm  |   -   l/Ed   -   -   -  l/sha  -   -   -  l/sha  -  |
*|-<-->-|-<->-|<----><----><-->-|<------>|-+-<---->-<------>|<--->|<---><--->|-<--->-<--->-<->-<->-<->-<--->-<->-<->-<->-<--->-<->-|
 |   A  |  B  |   C     D    E  |    F   | G   H       I    |  J  |  K    L  |   M     N    O   P   Q    R    S   T   U    V    W  |
*|------|-----|-----------------|--------|------------------|-----|----------|-----------------------------------------------------|

Explanations

ID:

  • A: unique ID (must begin with 'F'!)

Calculation options:

  • B: Calculation type [1-2]. Refers to the pervious areas; impervious areas are prinicpally calculated with the same calculation type. (1) = run-off coefficient method; (2) = SCS-Method. Further inforamtion on the needed parameters and the calculation methods can be found below.

Area parameters:

  • C: area [ha]
  • D: fraction of impervious area[%]
  • E: longest flow time in the catchment [min]. Utilized for the calculation of the reservoir constants; KSP(1) = 0.25 * (TFA+tf)/60. ); KSP(2) = 5.0*KSP(1)

Rainfall:

Evaporation:

  • G: Evaporation calculation type (1 = annual evaporation; 2 = evaporation time series / file)
    • H: annual evaporation [mm/a]
    The sum refering to grassland must be entered. This is overprinted internally by hydrographs according to Brandt[1] and Haude[2][3] and is adjusted to the Land use of each individual HRU.
    • I: Filenumber of the evaporation time series to be utilized (refer to *.EXT-File)
    only daily values may be within the time series since time series values are overprinted with a daily pattern! (Bug 1)

Calculation type 1: run-off coefficient method:

  • J: The run-off coefficient must be given (0 < ψ ≤ 1), which is defined as:
\psi = \frac{N_{eff} + E_T + h_v}{N}
mit:
Neff = effective rainfall
ET = evaporation
hv = initial losses (losses due to wetting and troughs)
also refer to http://de.wikipedia.org/wiki/Abflussbeiwert

Calculation type 2: SCS-Method: (Soil-Conservation-Service)

  • K: CN-Value (0 < CN ≤ 100)
  • L: 21 days prior rainfall height [mm] (distributed evenly over 21 days)

Rainfall:

  • M: Inhabitants [-] in order to calculate domestic dry weather flow
  • N: Qh [l/EW*d] - domestic water consumption
  • O: annual pattern [-] of domestic water consumption
  • P: weekly pattern [-] of domestic water consumption
  • Q: daily pattern [-] of domestic water consumption
  • R: Qg [l/s*ha] - commercial discharge
  • S: annual pattern [-] of commercial discharge
  • T: weekly pattern[-] of commercial discharge
  • U: daily pattern[-] of commercial discharge
  • V: Qf [l/s*ha] - inflow discharge
  • W: annual pattern [-] of inflow discharge

Literature

  1. Brandt, T. (1979): Modell zur Abflussgangliniensimulation unter Berücksichtigung des grundwasserbürtigen Abflusses, Technischer Bericht Nr. 24 aus dem Institut für Wasserbau, Fachgebiet Ingenieurhydrologie und Hydraulik der TH Darmstadt
  2. Haude, W. (1954): Zur praktischen Bestimmung der aktuellen und potentiellen Evapotranspiration. – Mitteilungen des DWD, Bd. 8; Bad Kissingen
  3. Haude, W. (1955): Zur Bestimmung der Verdunstung auf möglichst einfache Weise. Mitteilungen des DWD, 2 (11), Bad Kissingen