A. Used inverted freeze masking to select the part of the field where the river will be.
B. Cut selected area onto a seperate layer, then used clone stamp to delete most of the weeds from it.
C. Motion blur on the cut area.
D. Hue and saturation adjustments to turn the cut area blue.
E. Used clone stamp and healing brush to delete the fencing poles from the grass.
F. Fixed the edge of the water.
G. Used a brown brush set to hue blending to color the edge of the pond. Last picture shows small adjustment with clone stamp.