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irrigation (ir)
DEFINITION: Irrigation and drainage ditches, sealed water storage, etc

Table of Contents
      a. Object        
i. irrigation & drainage ditch = anthropogenic channels constructed to conduct either irrigation or drainage water, or both.
ii. water storage tank = impermeable tank or basin designed to hold water.
iii. wellhead = well and surrounding area within clear edges caused by management of the well, such as a sealed area or a compacted animal track created by use of animal traction for water pumping.
iv. bridge (>2m) = transportation across water, with water surface underneath.
v. retention pond = engineered basin, usually earthen, but sometimes a mix of surfaces and structures designed to hold and infiltrate water as part of a sealed surface drainage system.  May include trees or other vegetation.  Edges defined by basin top edge.  Note: FORM = RP.
      b. Modifier 1 (structure type)        
i. water storage tank
1. open top = water surface >75% open to sky.
2. covered  = <25% of water surface open to sky.
      c. Modifier 2 (sealed vs. permeable)        
i. permeable
ii. sealed
      d. Scale (of building footprint)       

i.  local roads, paths, & access

1. wide >2 m
Key                                                                                    Return

i. irrigation & drainage ditch

1. permeable = earth
a. wide (>2m) = ir01
2. sealed
a. wide (>2m) = ir02

ii. water storage tank

1. open top = water exposed
a. small (<30m) = ir03
b. large (>30m) = ir04
2. covered = water covered by a permanent cover.
a. small (<30m) = ir05
b. large (>30m) = ir06
iii. wellhead
1. permeable = ir07
2. sealedir08
iv. retention pond = ir09
Dominance Rules                                                             Return
1. IF TYPE with greater area is very similar or otherwise unclear:
a.Choose permeable over sealed.
b. Choose open top over covered.
2. IF feature includes a pump house with water tank:
a. IF >50% area is water tank or the water tank area is similar to the pump house area, then classify as ir.
b.  IF clearly <50% of feature is water tank, then use GROUP = nb.
3. IF paralleled by a <2 m transportation  feature, and unclear which has greater width or feature area:
a. Choose transportation over irrigation.
Factors                                                                             Return
IGBP_DIS: ?Urban and built-up
This class is identified with  .
L1 MINIMUM: >2m linear, >5m polygon
L2 MINIMUM: >0.2m linear, >2m polygon
Compatible Classes                                                         Return
AnthropogenicRetention Pond
Constructed  | 
Sealed  |  Bare soil  |  Annual  |  Mixed  |  Perennial  | 
ir01wide (>2m) permeable irrigation & drainage ditch.
ir02wide (>2m) sealed irrigation & drainage ditch.
ir03small (<30m) open top sealed water storage tank.
ir04large (>30m) open top sealed water storage tank.
ir05small (<30m) covered sealed water storage tank.
ir06large (>30m) covered sealed water storage tank.
ir07permeable wellhead.
ir08sealed wellhead.
ir09retention pond.

Mapped ECOTOPEs                                                           Return
ANCEir01  |  ANCEir07  |  ANCSir02  |  ANCSir03  |  RPCPir09  | 
2005 The Ecotope Mapping Working Group.  Please direct questions or comments about this website to: info@ecotope.org.
Last modified August 25, 2005.