Photograph of a view of a contoured pasture. OK-5107.

Photograph of a close up view of a terraced-o0utlet structure, with masonry and dry rock with buttressed knee. OK-5106.

Photograph of a "View of contour listing between terraces for row crop planting."

Photograph of contour furrows in pasture land in order to control and preserve water as precipitation falls. Results have proven that this is one way to develop a good pasture. OK-5011.

Photograph of wind carrying silt on a clean, cultivated field. Notice how the wind picks up the soil and carries it higher the farther it goes. Also notice that the soil is not picked up until the wind has a chance to gather momentum close to the ground. The soil in the foreground is not being carried as the end of the field is near, and the fence and vagetation act as a windbreak. This wind erosion is aserious problem in western Oklahoma, Kansas and Southwestern Nebraska. OK-5123.

Photograph of "Deep scouring in lister ridges running up and down the slope. Taken after a heavy rain. Notice the silting at the base of the slope. This soil was washed from the furrows immediately above."

Photograph of a spreader ditch with masonry spreaders torn out by flood waters. Picture taken shortly after six inch rain fell in one night. Notice gullying in spreader and how the water flows out of the banks fo the ditch. OK-5142.

Photograph of flood damage to a spreader ditch. Shows some bermuda grass stripping still in place and shows overfall at masonry spreader. Taken shortly aftersix inch rain fall in one night. OK-5136.

Photograph of flood damage to a spreader ditch. Shows masonry spreaders torn completely out by flood waters. Taken shortly after a six inch rain in one night. OK-5135.

Photograph of severe sheet and slight gully erosion on an unterraced field after a heavy rain. Notice how all the soil which has been loosened by the plow was taken out of the channel at the bottom of the drainage, and how the small gullies in general followed the direction of the lister plow furrows up and down the slope. OK-5154.

Photograph of effects of water concentration through drainage which should have been left in natural sod. Picture taken after a 6 inch rain in one night. This picture shows how the water washed out all the soil loosened by the plow. The plow marks are quite visible. OK-5141.

Photograph of the Paul Peeler farm. A spreader ditch with masonry spreaders torn out by flood waters. The picture was taken after a 6-inch rain-fall in one night. Note the gullying in the spreader and how the water cut the banks of the ditch. OK-5142.

Photograph of a break in newly constructed terrace showing overfall which developed above it from water coming down from breaks in higher terraces. The break here is at a fill which was not built high enough. Photo was taken shortly after a quick 6-inch rain. OK-5169.

Photograph of a specially-constructed grader made from an old road maintainer. It has no front wheels and hitches to the tractor for frontal support. The grader and tractor are equipped with lights and is now working three eight-hour shifts a day. The graderfixed up in this way is very efficient. OK-5167.

Photograph of a specially-constructed grader made from an old road maintainer. This grader has no front wheels and hitches directly to the tractor for frontal support. The grader fixed up in this way is very efficient. The grader and tractor are equipped with electric lights for night work and is being run three eight-hour shifts a day. OK-5166.

Photograph of a contour furrowed pasture on the Miles Robbins farm. The back of the photograph proclaims, "50 acre pasture contour furrowed."

Photograph of the aftermath of a six-inch rain, which broke the Elk City Reservoir Dam. Notice the concrete debris in the foreground. The back of the photograph proclaims, “View of broken dam from downstream side. A six inch rain in one night caused the dam to overtop its entire length and finally break. Notice the huge pieces of concrete from the core wall and facing that were carried down by the water. A large bridge washed through this break. This dam and reservoir, which cost $350,000, silted in 48% in nine years and was soon to be abandoned because its storage capacity was reduced too much for it to be relied upon for city water supply.”

Photograph of many large breaks in new terraces caused by quick 4 1/2 inch rain on April 30, 1936. Notice scouring in foreground. These are level terraces and some of the breaks are up to 200 feet long. OK-5173.

Photograph of a view of a broken dam from the downstream side. A six inch rain in one night caused the dam to overtop its entire length and finally break. Notice the huge pieces of concrete from the core wall. As facing the wall, they were carried down by water. A large bridge washed through this break. This dam and resevoir, which cost $350,000, silted in 48% in nine years and was soon to be abandoned because its storage capacity was reduced too much for it to be relied upon for the city water supply. OK-5144.

Photograph of an extremely large gully which has a large diversion ditch at its head. OK-5199.

Photograph of buffalograss sod with root system exposed showing how the matt of roots forms an erosion resistant net. The back of the photograph proclaims, “Buffalo grass sod with root system exposed showing how the matt of roots forms an erosion resistant net. At the left is a runner which if undisturbed would have started new grass plants at each group of blades. Taken to illustrate an article by Mr. Ivy Howard.”

Photograph of cotton rows growing on the contour on the side of the hill, while alfalfa grows at the bottom of the slope on the Marion Bryant Farm. The back of the photograph proclaims, “The cotton rows are on the contour on the side of the hill, while the alfalfa is at the bottom of the slope. In former years when the cotton was farmed in straight rows up the slope, there was a great deal of washing in the sandy soil of the cotton field and the silt was deposited in the alfalfa, threatening to destroy it. The cotton field was then contoured and since then there has been no damage to the alfalfa below.”

Photograph of a cotton field that is unnecessarily terraced to prevent erosion on the R. O. Haddock Farm. The back of the photograph proclaims, “On long gentle slopes it is not necessary to terrace fields to prevent erosion. Here we have a field, which is planted to cotton on the contour. This slope is very good for the prevention of erosion, but when these cotton rows have a strip of some sown crop at intervals on the contour, erosion is practically eliminated. The sown strip here is maize."

Photograph of S. F. Nixon next to an eight foot overfall at the lower end of a terrace outlet channel.