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Table 1. 1'IU' m;ljor l-xlerna] phy!>1cal f;),turs affl'ctinl: the WhiLl R i....cr Syst l-'lfl. A. Dir PC [ .'1tmosrh(>r ic cont r ibut ion (1) l'n'cipitat1on (dissolved. suspt:ndl'd suhsl:l1lces). (2) Ory fall (nicrogcn. phosphorus. metals. etc.). ()) 1.ight (!-o0lar radiation. photoperJod. intensity). (4) lIl'at (tl-ml'('ratllrc.-). B. Surface flo.... from acji:JCl.nt \Jatersht-ds (I) liater. (2) Dissolved constituents (nutrients. metals. etc.). ()) Suspended const ituents. (a) Inorganic (sl:'diment. silt. nitrogen. etc.). Cb) Organic (detritus. insects. plants. etc.). C. Upstream contribution (I) Water. (2) Dissolved constituents (nutrients. metals. etc.). (3) Suspended constituents. (a) Inorganic (St:~imen[. silt. nitrogen. ~tc.). (b) Organic (ot'"tritus, insects. plants. etc.). (4) Hear (l(<nperatur~). D. Ev.'lporation - crystallization process discharge patterns (Figure 4). Major stream systems flowing through desert or arid regions usually receive upstream contributions from higher elevations which may receive comparatively high precipitation. The upstream contribution occurs during three periods. The first is spring melting of lowland snow packs (lower basin runoff). Lower basin runoff represents only a small portion of the spring runoff, but the nutrient content of this source water is high. This factor, in combination with the low quantity of water, results in increasing nitrogen and phosphorous levels in the White River at a time when temperatures are increasing (Figures 4 and 6). The second major water input into the White River is the snow melt from high elevations (upper basin runoff). The third is baseflow. The importance of discharge (seasonal or storm events) on the biological components are numerous and important because of the potential for large biological changes brought about by rapid changes in the physical and chemical environment (habitat). 270 1000 I ... " c; Z en ~ Z t- 200 Figure inorgani represen INTERN! F rivers were t deposi geolog system dynami geomor terms consid charac Channe I water load t predi< s t rear Strucl imporl noted t r i bu I the sil ta