Land and Watershed Management - Practices of Irrigation and On-farm Water Management - page 237

contamination. To help communities, watershed protection plan maps should be
developed of all public water supply watersheds.

6.7.3 Wetland Management in a Watershed

Policies should be developed to protect and manage the wetlands in the watershed
(Fig. 6.5 ) . Wetland is necessary to help keep groundwater recharged.

Fig. 6.5 We t l and

In watershed management program, focus should be made covering the following
aspects:

(1) Water quality improvement from management practices in agricultural

watersheds.
Under this category, measurement should be taken on the transport of nitrate,
phosphorus, and fecal indicator bacteria in watersheds. This information is
related to the terrain, soils, and agricultural practices within the watersheds.
Methods should be developed to identify areas where wetlands, buffers, and
other conservation practices can provide water quality benefits.
(2) Biological buffers for improving water quality in agricultural landscapes.
Riparian buffers are largely effective in reducing transport of nutrients, pes-
ticides and sediments by filtering the runoff water before it enters a stream.
Subsurface nutrient uptake by buffer system may be examined.
(3) Site- and time-specific crop, tillage, and nutrient management for sustainable
agro-ecosystems .
The long-term yield responses to soils, nitrogen fertilizer, and water should
be monitored. This information may allow us to determine management