r' 
The; Waters of the Rio Grande 6i 
INDEX 
Agricultural features of the question. 
Alkalis— 
Unfavorable conditions prevail wherever water is alkaline. 
south and west of river. 
Unproductiveness due to some cause other than alkalis. 
White alkalis not injurious to crops. 
Analyses—(See Index to Tables) . 
Application of gypsum would be helpful. 
Artesian waters— 
artesian waters^ the . 
Analyses of white artesian waters.. 
Brown artesian waters . 
Spring-waters . 
White artesian waters and spring-waters would not affect river- 
water . 
Carbonates, origin of the. 
Changes in waters of eastern slope. 
Drainage not the main problem. 
Greasewood (sarcobatus)— 
indicates presence of sodic carbonate. 
relation to sodic carbonate content of soil. 
Ground-water, south and west of river. 
Gypsum, application of would be helpful. 
ETydrological facts, a review of. 
Return water, none flows into river. 
Review of hydrological facts . 
Rio Grande river, height of bed cause of excess sodic carbonate. 
Rio Grande water— 
analyses of . 
Analyses seem to indicate no return water flows into river. 
Excess water, what becomes of?. 
Facts indicate that river loses in volume and maintains character of 
mountain stream . 
No return water flows into river. 
River only discharge but not only source. 
White artesian and spring waters would not affect. 
San Luis Valley— 
Bed of river higher than valley. 
conditions exceptional . 
San Luis Lake water . 
Sodic carbonate— 
greasewood indicates presence of. 
Height of bed of Rio Grande cause of excess sodic carbonate. 
large amounts of poured onto lands by wells. 
origin of . 
production of from felspars. 
Relation of greasewood to sodic carbonate content of soil. 
Soil samples taken to prove result. 
Spring-waters . 
Sub-irrigation has caused water-logging. 
Summary . 
Unfavorable conditions prevail wherever water is alkaline. 
Unproductiveness due to some cause other than alkalis. 
| Waters of valley, including surface-, ground-, and drain-waters, differ 
from waters of Rio Grande. 
Water-logging, subirrigation has caused. 
White alkalis not injurious to crops. 
43 
54 
14 
47 
46 
62 
57 
29 
30 
35 
31 
32 
37 
3 
56 
45 
27 
14 
57 
51 
12 
5i 
56 
8 
12 
34 
33 
12 
34 
32 
7 
6 
39 
45 
56 
38 
37 
28 
27 
55 
31 
43 
58 
54 
47 
26 
43 
46 
