IWMP-3 - Commissionerate of Rural Development Gujarat State ...

DWDU, Rajkot
2. Trapping silt which slows the rate of siltation in water harvesting structures in the lower reaches of the watershed.
3. Creating a hydraulic head locally which enhances infiltration of surface runoff into the groundwater system; and
4. Increasing the duration of flow in the drainage line. Therefore, the capacity of the water harvesting structures created downstream on the drainage
line is utilized more fully as they get many more refills.
3. Gabions
Gabion structures are rock and wire dams constructed across drainage lines with a catchment area of 50-500 ha. They are also constructed to
reinforce highly erodible stream embankments. The main aim of constructing gabion structures is to reduce the velocity of water flowing through
the drainage line. By reducing the velocity of runoff, gabion structures help in
1. Reduction in soil erosion
2. Trapping silt, which reduces the rate of siltation in water harvesting structures in the lower reaches of the watershed.
3. Increasing recharge of groundwater and
4. Increasing the duration of flow in the drainage line. Therefore, the capacity of the water harvesting structures created downstream on the
drainage line is utilized more fully as they get many more refills.
Detailed Project Report: IWMP-III 64