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Water Status Evaluation in Tertiary and Secondary Blocks of South Sumatera Reclaimed Tidal Lowland Using the Hydrotopography and SEW-30 Concept

5 January 2010 1,620 views No Comment

By Robiyanto Hendro Susanto, at “Young Professional Forum Seminar/Seminaire du Forum des Jeunes Professionnels.” (International Commission on Irrigation and Drainage Seminar, Bali, July 23, 1997).

Agencies involved in tidal lowland development and management have been using the hydrotopography concept to express the water status at a concern site. Soil water status at the crop zone under tidal lowland condition is affected by the water menagement strategy adapted and a strong determinant for the type of crops grown and the cropping calendar.

At present, it is quite difficult to evaluate the water status at the root zone due to insufficient observed data. Hydrotopography concept classified tidal lowlands as type A, B, C and D from the wettest. The use of this concept is sometimes misleading. The area of one secondary block (256 ha) or tertiary block (32 ha), as the structure’s division, which can be considered as one water management unit is not always homogeneous as far as water status concern.

Qualification of the total standing water in a certain period of time or growing season above the 30 cm depth below the soil surface is expressed in cm-day in the SEW-30 concept. Related issues with both hydrotopography and SEW-30 concepts for a more quantitative status will be discussed.

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