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Subject CC&V Made by TLg .lob 003-2142 Task 6 <br />Golder Bateman Pond Hydrology cneckea by Data 7/11/2001 <br />~.~.SSOC121>eS <br />Incl. Contributing Ponds Approved by Sheet 2 of 2 <br />All basin areas, curve numbers, times of concentration, and routing information are summarized in <br />Tables lA - 1C. HEC-1 model output is in Attachment A. The Crusher Sedimentation Pond <br />sizing, Arequa Gulch Sedimentation Pond sizing, and BMP Sump sizing are in Attachment B. <br />Spillway calculations are also in Attachment B. <br />CONCLUSIONS/RESULTS: <br />Pond elevation-azea calculation summaries are shown in Table 2. Pond and sump dimensions, <br />capacities, and spillways are in Table 3. The BMP Sump, Arequa Sedimentation Pond, and Crusher <br />Sedimentation Pond are sized to contain runoff from two times the 10-year, 24-hour storm. The <br />Bateman Creek Detention Pond is designed to attenuate flow resulting from the 100-year, 24-hour <br />storm. <br />As described in Table 3, Bateman Creek Detention Pond has a design capacity of 1.1 acre-feet at the <br />spillway elevation and is triangular with a top width of 135 feet, a top length of 135 feet, and a depth <br />of 10 feet below the spillway. The peak outflow from Bateman Creek Detention Pond is estimated by <br />HEC-1 to be 90 cfs for the 100-year, 24-hour storm. Spillway weirs have the capacity to carry the <br />100-year, 24-hour storm when the respective ponds or sump are full. Weir dimensions are given in <br />Table 3. <br />1. U. S. Soil Conservation Service (USSCS). 1986. Urban hydology for small watersheds, 2nd <br />edition (USSCS Technical Release Number 55). Washington D.C.: United States Department of <br />Agriculture. <br />2. Haestad Methods. 1989. HEC-1 [computer sofrwaze]. Waterbury CT :Haestad Methods Inc. <br />*Hydrology routing software <br />3. "Rainfall Frequency Atlas of the Western United States, Volume III, Colorado", (1973) U.S. <br />Department of Agruculture, Soil Conservation Service, Washington, D.C. <br />4. Letter to Office of Mined Land Reclamation (OMLF) for the Cresson Project: Permit M-80- <br />244: Surface Water Drainage Modifications for Arequa Gulch Overburden Storage Area, dated <br />March 4, 1997. <br />5. Roberson, John A., Cassidy, John J., Chaurdhry, M. Hanif. 1995. Hydraulic Engineering, New <br />York: John Wiley and Sons, Inc. <br />6. U.S. Federal Highway Administration (FHWA). 1996. HY8 -Culverts Version 6.0 FHWA Culvert <br />Analysis May. Washington, DC.: FHA Office of Technology Applications. <br />F~Ic Namc: C:\DOCDME'I\jlupo\LOCAIS'I\TCmp\aa¢man Pond Hydrology irtl coon poM,.dac <br />