International Rainwater Catchment Systems Conference
Mannheim, Germany - September 2001
Rainwater Catchment in Agriculture
Effectiveness of Rainwater Catchment on Flood Control in Slope Land Area
K.F. Andrew Lo and Chao-Chun Huang
Department of Natural Resources
Chinese Culture University
Taiwan is a mountainous island. The total area is about
36,026 km2. The Central Mountain Range runs north to south, dissecting
the island into two halves. Flatland with less than 100 m elevation comprises
26.4% of the total area. The remaining 73.6% is slopeland. Forest cover
in higher elevation is about 46.6%. Along the Central Mountain Range,
there are about 20 peaks exceeding 3,000 m. Rivers originate from mountain
tops flow east and west to the Pacific Ocean and the Taiwan Strait, forming
narrow river valleys as a result of torrential river flow. Suitable reservoir
sites are limited.
The average annual rainfall is about 2,500 mm. However,
rainfall is unevenly distributed both temporally and spatially. The north,
central, south and east receive about 62%, 78%, 90%, and 79% of the total
rainfall during the month from May to September, respectively. Wet and
dry seasons are very pronounced. The available water resources are limited.
Due to increases in population, economic development, housing areas, and
agricultural land, slopeland ecology has been damaged, resulting in severe
soil erosion and runoff, ruined water retention capacity, accelerated
water pollution rate, and deteriorating sedimentation and water pollution
problems in reservoirs.
Torrential typhoon rains often lead to massive soil movement
and landslides; concentrated runoff and large peak flow, causing significant
damages downstream in the Hsichih area, Taipei. The main objective of
this study is to determine the effectiveness of storm water collection
using small infiltration enhancement structures and retention ponds on
storm runoff reduction and flood control.
PDF of full document (5pp, 42kb)
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