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Quantification of an overlooked water resource in the tropical rainfed lowlands using RapidEye satellite data: A case of farm ponds and the potential gross value for smallholder production in southern Laos

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  • Vote, Camilla
  • Eberbach, Philip
  • Inthavong, Thavone
  • Lampayan, Rubenito M.
  • Vongthilard, Somsamay
  • Wade, Len J.

Abstract

In southern Laos, water stored in farm ponds is largely underutilised as it is perceived to be unfit for human consumption; subsequently, groundwater is the preferred source for domestic and agricultural consumption. For the first time, this paper presents the results of a study designed to quantify the total pond water volume within the landscape via remote-sensing methods in two districts in Champasak province that could be used to improve rural household cash income through the expansion of market-oriented dry season crop production. Water bodies were delineated via simple classification of RapidEye data using the Normalised Difference Water Index and a sub-classification was performed to distinguish between ponds and the streamflow network. Final estimates of total pond volume in Sukhuma and Phonthong districts were ∼2.30 × 106 m3 and 3.55 × 106 m3, respectively; and the average pond volume across both districts was ∼1987 m3. Sensitivity analysis of the potential gross value of farm ponds for irrigation of dry season, vegetable production typical of market-oriented smallholder activities in the area indicated that substantial gross economic gains could be made from better use and management of these resources.

Suggested Citation

  • Vote, Camilla & Eberbach, Philip & Inthavong, Thavone & Lampayan, Rubenito M. & Vongthilard, Somsamay & Wade, Len J., 2019. "Quantification of an overlooked water resource in the tropical rainfed lowlands using RapidEye satellite data: A case of farm ponds and the potential gross value for smallholder production in southern," Agricultural Water Management, Elsevier, vol. 212(C), pages 111-118.
    • Handle: RePEc:eee:agiwat:v:212:y:2019:i:c:p:111-118
    DOI: 10.1016/j.agwat.2018.08.016
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