Grass · drainage · SUEWS parameter database

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Grass · drainagegrass evidence record

storage_drain_params.drain_eq3

storage_drain_params.drain_coef_10.013

storage_drain_params.drain_coef_21.71

wet_threshold1.9

drainage grass generic generic Land-cover class Järvi 2011

Parameters

Names follow the SUEWS YAML specification; click one for its definition in the configuration reference.

`storage_drain_params.drain_eq`	3
`storage_drain_params.drain_coef_1`	0.013
`storage_drain_params.drain_coef_2`	1.71
`wet_threshold`	1.9

Provenance evidence

Awaiting sign-off

Published value · assessed by provenance-audit · 2026-08-24. Agent assessment is evidence preparation, not human verification.

The Surface Urban Energy and Water Balance Scheme (SUEWS): Evaluation in Los Angeles and Vancouver.Parameter source

Where: Table 2a, model parameter values by surface type, p. 223

Gives grass storage Si 1.9 mm, maximum drainage rate D0 0.013 and coefficient b 1.71; Eq. 18 on p. 224 defines the exponential drainage form for unirrigated vegetation.

CO2 uptake of urban vegetation in a warming Nordic cityLater compilation

Where: Input_rcp.zip/Input_rcp/SUEWS_Veg.txt, rows 860, 865, 8602 and 8652

The Helsinki lawn and mixed-low-vegetation grass rows each carry WetThreshold 1.9, DrainageEq 3, DrainageCoef1 0.013 and DrainageCoef2 1.71, demonstrating later configuration reuse.

Assessment findings

Name	supported Grass is the source surface category and avoids presenting later application cities as parameter origins.
Target	supported Järvi et al. publish the values for grass and the Havu archive stores the tuple in grass rows, matching land_cover.grass.
Values	supported Järvi et al. (2011) Table 2 gives grass storage 1.9 mm, D0 0.013 and b 1.71, with Eq. 18 defining the exponential drainage form. Havu's archived grass rows 860, 865, 8602 and 8652 carry WetThreshold 1.9, DrainageEq 3, DrainageCoef1 0.013 and DrainageCoef2 1.71, exactly matching the record.
Source	supported Järvi et al. (2011) is the parameter publication. The Havu archive is retained as compilation evidence showing where the later configuration reused the tuple.
Place	supported Järvi et al. publish a surface-type parameter rather than a city fit, so generic is the supported evidence place; origin London preserves the migrated row's lineage. issue #233
Representativeness	supported Generic reach reflects a literature parameter reused across cities rather than a city-wide determination. issue #233
Applicable Scale	supported Table 2 assigns the tuple to the grass surface type, establishing land-cover-class scale.
Method	supported Literature accurately describes transcription of an earlier published parameter tuple.
Identity	supported One grass drainage record holds the storage threshold, drainage equation selector and two coefficients that travel together in the archived SUEWS vegetation rows.

Scientific note

Järvi et al. (2011) publishes the generic grass storage and drainage tuple, and Havu's archived input later reuses it in Helsinki configurations. The stable path and origin preserve migration lineage; the active name and scope now describe the source evidence rather than later application cities. No parameter value changed.

Model-ready fragment

Paste under land_cover.grass in a SUEWS YAML configuration; every value carries its citation.

storage_drain_params:
  drain_eq:
    value: 3
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic, land_cover
  drain_coef_1:
    value: 0.013
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic, land_cover
  drain_coef_2:
    value: 1.71
    ref:
      ID: jarvi2011
      DOI: 10.1016/j.jhydrol.2011.10.001
      desc: generic, generic, land_cover
wet_threshold:
  value: 1.9
  ref:
    ID: jarvi2011
    DOI: 10.1016/j.jhydrol.2011.10.001
    desc: generic, generic, land_cover