Browsing by Author "Weigmann, Diana L."
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- Common water plants of VirginiaHelfrich, Louis A.; Pardue, Garland B.; Weigmann, Diana L. (Virginia Cooperative Extension Service, 1981-10)Identification guide to Virginia's aquatic plants.
- The concept of instream flow and its relevance to drought management in the James River BasinVadas, Robert L.; Weigmann, Diana L. (Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1993-09)
- Guidelines for liming acidified lakes and pondsWeigmann, Diana L.; Helfrich, Louis A.; Josephson, Daniel C.; Speenburgh, Renee M. (Virginia Water Resources Research Center, 1992)
- Guidelines for Liming Acidified Streams and RiversWeigmann, Diana L.; Helfrich, Louis A.; Downey, Daniel M. (Virginia Water Resources Research Center, 1993)Our companion publication on this topic, Guidelines for Liming Acidified Lakes and Ponds>/i> covers the addition of limestone, calcium carbonate (CaCQ3) to nonflowing surface waters. You may want to order a copy of that publication. The general information on liming lakes and ponds may be of interest and useful if you are considering whether to treat a river or stream. Limestone can be added to streams whose watersheds are deficient in natural calcium carbonate deposits and, therefore, have limited capacity to neutralize acid loadings. This publication addresses the addition of limestone to flowing water systems, primarily small headwater streams, that are affected by acid deposition or mine acid drainage. Five different methods of applying limestone are presented, and the advantages and disadvantages of using each method are compared. Appendices provide conversion factors for relevant measurements, a simple limestone dosage model used for calculating application rates in streams, examples of experimental limestone application sites, and water quality requirements for selected sport fish.
- Help Save America's Pearly MusselsHelfrich, Louis A.; Neves, Richard J.; Weigmann, Diana L.; Speenburgh, Renee M.; Beaty, Braven B.; Biggins, Dick; Vinson, Hilary (Virginia Cooperative Extension, 2005-09-01)Provides a brief look at freshwater mussels -- what they look like, where they live, what they eat, why they are valuable, how they are used, why some are in trouble, and how to protect these simple but important aquatic animals -- and includes a key for species identification.
- Landowner's Guide to Managing Streams in the Eastern United StatesHelfrich, Louis A.; Weigmann, Diana L.; Neves, Richard J. (Virginia Cooperative Extension, 2009-05-01)This publication provides general information and management guidelines to help stream property owners and their neighbors protect, improve, and restore streams.
- New directions in pesticide research, development, management, and policy : proceedings of the Fourth National Conference on Pesticides, November 1-3, 1993National Conference on Pesticides (4th : 1993 : Richmond, Va.) (Virginia Water Resources Research Center, 1994)
- Overview of pesticide effects and pesticide application in Virginia agricultureYounos, Tamim M.; Weigmann, Diana L. (Virginia Water Resources Research Center, 1988-06)
- Pesticides and Aquatic Animals: A Guide to Reducing Impacts on Aquatic SystemsHelfrich, Louis A.; Weigmann, Diana L.; Hipkins, Patricia A.; Stinson, Elizabeth R. (Virginia Cooperative Extension, 2009-05-01)Serves as a general guide for those who may use pesticides in or around natural wetlands, lakes, ponds, rivers, and streams by providing information about the toxicity and safe use of pesticides that have the potential to enter aquatic systems.
- Regulatory permits and requirements for commercial aquaculture in VirginiaHelfrich, Louis A.; Libey, George S.; Weigmann, Diana L.; Smith, Stephen A.; Buck T. R. (Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1993-08)This publication summarizes the permitting process for commercial aquaculture by identifying the types of permits needed, the responsible agencies, and sources for assistance with regulations and with general aquaculture information. A number of permits from a variety of state and federal regulatory agencies are required for fish farming in Virginia (Table 1). The permits necessary depend on the species of fish reared and the size and location of the prospective enterprise.
- Threats to Virginia's groundwaterWeigmann, Diana L.; Kroehler, Carolyn J. (Virginia Water Resources Research Center, 1988)
- Zebra Mussels Pose a Threat to Virginia's WatersHelfrich, Louis A.; Weigmann, Diana L.; Speenburgh, Renee M.; Neves, Richard J.; Kitchel, Lisie; Bruenderman, Sue A. (Virginia Cooperative Extension, 2005-09-01)Provides an brief introduction to the invasion of the zebra mussel into American waters, explains the economic consequences they pose, and discusses if Virginia will inherit the problem, what the public can do to help, the general lifecycle of the zebra mussel and if they can be controlled, and who is working on the zebra mussel problem.