CheckDam-Introduction

Drainage line is a natural water course conveying run off from ridge point to the point of concentration or outlet. This needs treatment both vegetative and stone checks to reduce silt load in the runoff storage structures. Masonry and Earthen barriers can be put up to create head to harvest run off water for recharge of ground water. Check dam is a stone masonry structure put up across the drainage line with catchment more 25 to 200 ha for harvesting runoff and to encourage ground water recharge.

Steps for Check Dam

• Codification of the Drainage network (Stream order No.)
• Demarcating the catchment of each order (first/second etc.) of the Drainage network using LRI Maps.
• Estimate total quantity of potential runoff depth in mm for each stream order.
• Knowing the catchment area (Ha.) of each order and potential depth of runoff (mm.), quantity of available total runoff (Q) is arrived at by using the formula and consolidated in Table-7.3 (a) and 7.4 . Q (Cum.) = catchment area of the stream order in question (Ha.) *10 *Potential runoff depth (mm.).

Note: Since the delineation and estimation of runoff at first and second stream order level is not possible at present, the potential runoff to be obtained for the whole MWS is to be taken into consideration for deciding the number of check dams under this DSS.