Land treatment of wastewater 391
RemarksHigh installation costs Considered labour required for irrigations When used for close-spaced crops a high percentage of land is used for levees and distribution of water use possible. Lower installation costs and less labour required for irrigation than small basins. Substantial levees needed. Little land grading required. Checks can be continuously flooded (rice), water ponded (orchards), or intermittently flooded (pastures)Soils Suitable for soils of high or low intake rates; should not be used on soils that tend to puddle Soils of fine texture with low intake rates Soils of medium to heavy texture that do not crack on dryingWater quantity Can be adapted to streams of various sizes Large flows of water Flows greater than 1 ft3 /sTopography Relatively flat land; area within each basin should be levelled. Flat land; must be graded to uniform plane. Irregular land, slopes less than 2%Suitabilities and conditions of use Crops Grains, field crops, orchards, rice Grains, fild crops, rice Orchards, grains, rice, forage cropsTable 8.5 Surface irrigation methods and conditions of use Irrigation methods Flooding Small rectangular basins Large rectangular basins Contour check