RECTIFICATION OF THE RIO GRANDE-MEXICO. FEB . i, 1933. 1643 '.- PROBABLE SPILL AT ELEPHANT BUTTE DAM. (a) An estimate of the~robable spill at Elephant Butte Dam has been made from a study of the ~ills as shown in the report of the Denver office of the Bureau of Reclamation, dated March 10, 1928 and entitled "Review of Quinton, Code and Hill Reports on Elephant Butte Power Devel- opment of July 2, 1927 and Sep- tember 30, 1927". This review sets up the following assumptions: I.- Irrigation storage is to be carried to elevation 4401, leaving six feet (1.83 meters), or the eleva- tion 4407, for flood control stor- a~e. This six feet (1.83 meters) will store two hundred thirty- nine thousand (239,000) acre feet (294.806,000 cubic meters). Ad- ditional flood control storage of about one hundred thousand (100,000) acre feet (123.350,000 cubic meters) is available to ele- vation 4410, at which height a discharge of about four thousand five hundred (4,500) second feet (128 cubic meters per second) will be passing over the spillway crest. 2. - Irrigation demand is to be limited to seven hundred thou- sand (700,000) acre feet (863.450.- 000 cubic meters) annually when on June 30th of any year the reservoir content is less than one million five hundred thousand (1.500,000) acre feet (1.850,250,- 000 cubic meters). Irrigation demand is to be limited to seven hundred eighty-seven thousand (787,000) acre feet (970.764,000 cubic meters) annually when on June 30th of any year the reser- voir content is more than one million five hundred thousand (1.500,000) acre feet (1.850,250,000 cubic meters). 3.-Reservoir capacity- deple- tion thru silt deposit IS at the average rate of twenty thousand (20,000) acre feet (26.670,000 cubic meters) per year. 86637" -:H-PT 2-2:l "-PROBABLEB DEMABIA8 DE LA MlnutINo.l .oIla- • ternatloaal BouIlduJ' PREBA DEL ELEFANTE. Commlllion-Contd. (a) En un estudio hecho por la Oficina de Denver del "Bureau of Reclamation" fechado ell0 de marzo de 1928 y titulado "Review of Quinton, Code and Hill Re- ports on Elephant Power Devel- opment of July 2, 1927 and Sep- tember 30, 1927" se hace Ia estimaci6n de las probab1es De- masias de Ia Presa del Elefante. Este estudio establece los siguien- tes supuestos: I.-El almacenamiento para rie~o debe limitarse hasta la cota 4401, dejando 1.83 Mts. (6 pies), o hasta la cota 4407, para al- macenamiento de protecci6n con- tra inundaciones. En esta. altura de 1.83 Mts. (6 pies) se almacena- ra un volumen de 294.806,000 metros cubicos (239,000 acres pies). Puede obtenerse un al- macenamiento adicional para pro- tecci6n contra inundaciones con volumen aproximado de 123.350,- 000 metros cubicos (100,000 acres pies) hasta la cota 4410 1 altura a la eual escurrira sobre a Cresta del Vertedor de Demasias un gasto de 128 metros cubieos por segundo (4500 pies cubicos por segundo). 2.- EI volumen necesario para cubrir las necesidades del riego debe limitarse a 863.450,000 me- tros cubicos (700,000 acres pies) anualmente, cuando el contenido del receptaculo el 30 de junio de un ano cualquiera sea menor de 1.850,250,000 metros cubicos, (1. - 500,000 acres pies). El volumen para riego debe limitarse a 970 .• 764,000 metros cubicos (787,000 acres pies) anua1es, cuando el contemdo del receptaculo el 30 de junio de un ano cualquiera, exceda de 1.850 .250,000 metros cubicos (1.500,000 acres pies). 3. -La diminuci6n de la capaci- dad del vaso por azolve se esti- rna a raz6n de 24.670,000 metros cubicos (20,000 acres pies) al ano.
