PERMFILE51108

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 08H‎(1)‎ Montgomery Watson Evaluation of Pond D 1999
• Media Type: D
• Archive: No

Flay 1999 CYDrur Tmrnq~mile ' Parrr! D Eua/ualiarr 1 1
TABLE OF CONTENTS
Secrion
Pae^~No.
1.0 I N TRO D U CT [ O N ......................................................................................... ........................................1
2.0 HI'DROLOGIC C1.LCUL~ITIONS .......................................................... .......................................1
2.1 Precipitation Distribution ................................................................. .......................................2
2.2 Storm Ducation .................................................................................. .......................................2
2.3 Return Period/Precipitation ............................................................. .......................................2
2.4 Hydrograph Response Shape ........................................................... .......................................2
2.5 Drainage Basin rlrea .......................................................................... ....................................... 2
2.G Time of Concentration, T~ ............................................................... .......................................2
2.7 Tvluslungum Routing Parameters, K,.l' .......................................... .......................................3
2.8 Curve Number, CN ........................................................................... .......................................3
2.9 mine Pumping and Spring \r/ater InIlo~v ....................................... .......................................3
3.0 SEDIMENTr\TION C.•1I.CULr1TIONS .................................................... .......................................3
3.1 Rainfall Factoc, R ............................................................................... .......................................4
3.2 Soi] Erodibility Factor, K .................................................................. .......................................4
3.3 Length-Slope Factor. LS ................................................................... .......................................4
3.4 Control Factor, C ............................................................................... .......................................4
3.5 Practice Factor, P ............................................................................... .......................................4
3.6 Sediment Particle Dtstribution ......................................................... .......................................5
• 4.0 POND D SUM\•Ir1R1 .................................................................................... .......................................5
5.0 REFERENCES ................................................................................................. .......................................7

~lon[gomen' \t'atson ~Lning Group ' IGS S l'nion Bukle~ard, 5u¢e 4L11' Lakewood, Colorado 80228' (303) iG3-5140